Phenomenology of being a safe taxi driver

Background In developing countries, a great number of people typically utilize public transportation such as Taxis. Therefore, taxi drivers have an important role in residents’ well-being and safety. The aim of this study was to describe the subjective experiences and insights on safe driving among taxi drivers in Zanjan, Iran. Method In this qualitative study, 17 taxi drivers (23–54 years) were purposefully selected to participate in 11 semi-structured interviews, as well as one focus group (n = 6). The data was then analyzed based on a combination of Braun’s and Colaizzi’s methods. Result By analysis of the qualitative data, four main themes emerged from expressed experiences by taxi drivers, including 1) traffic chaos, 2) social prestige, 3) economic pressure, and 3) job satisfaction. Conclusion The emerging concepts of the present study imply a threefold structure of existence, which introduced by Heidegger, as taxi drivers’ (the self) feelings and experiences of being under pressure of traffic chaos (the world), accompanied by low social prestige, economic pressure and job dissatisfaction (being in). Thus, strategic planning for traffic safety should consider taxi drivers’ needs to feel a friendly world, as well as, to find themselves in a respectful and supportive environment.


Background
In many middle and low-income countries, public transport is the primary means of inner-city traveling [1]. Since taxis are usually in the center of transportation services, taxi drivers have an important role in residents' well-being and safety [2]. It has been widely demonstrated that driving can be a challenging career in terms of occupational risks and accidents. It is considered that professional driving involves higher risks than most of the other work trades. Professional drivers are more likely to suffer from severe injury or severe permanent disabilities in comparison with other occupations categories [3]. Besides, other workers are involved in road traffic accidents. According to European Road Safety Observatory, traffic accidents are the leading cause of work-related deaths and long-term injuries. Approximately 40-60% of work-related accidents resulting in death are attributed to road accidents, which impose a remarkable economic burden [4]. Besides, a driver's unsafe behavior can be potentially dangerous for other road users [3].
The nature of professional driving is such that it can result in adverse health effects such as fatigue, drowsiness, stress, mental/physical symptoms, and depression [5]. Professional drivers, e.g., taxi drivers, have to deliver their service in repeatedly stressful and dangerous conditions like long working hours, traffic jams, multiple driving tasks, the argument with passengers [6]. Santos (2016) showed that the highest prevalence of occupational stress in Spain was related to professional drivers [5]. Since job stress is well-known as a dominant risk factor in explaining crash causes [7], these conditions lead to an increase in being involved in road accidents [8]. There is convincing evidence showing that taxi drivers in/directly involved in a large number of traffic accidents [9]. Rowland et al. (2007) expressed that the risk of crashes for taxis was almost 16 times higher than any other vehicle [10].
Studies in Australia [11], China [12], and Taiwan [13] described the stress resulted from long working hours, lack of rest time, low income, and high taxi driver licensing cost. Since taxi drivers' income is dependent on the travel distance in passenger transport, they mostly struggle to save time by over-speeding and acting other driving violations in order to pick up as many passengers as they can. Thus, one can say that taxi drivers' accidents may be dramatically rooted in economic pressures and income [8].
In Iran, financial loss due to the high number of fatalities caused by road traffic accidents accounted for more than 5% of the gross domestic product (GDP) [14]. Moreover, the disability-adjusted life years (DALYs) due to road traffic crashes are estimated to be more than diseases such as cardiovascular diseases or cancers [14,15]. Several studies focused on aspects like fatigue problems [11], regulation non-compliance [16], vision problems [17], risk-taking and risk perception [2,18,19], the influence of personality and demographic characteristics [20][21][22], and safety belt use [23,24]. Most of these studies focused on physical or behavioral risk factors.

Objective
The aim of this study was to describe the subjective experiences and insights on safe driving among taxi drivers in Zanjan, Iran. Few pieces of literature explore the potential impact of taxi drivers' feelings about their occupation and work circumstances on their safe driving behavior. The lack of knowledge of taxi drivers' sensory experiences and cognitive implications makes it challenging to figure out the triggering factors of road crashes.
This phenomenological interpretative study aimed to discover subjective experiences and feelings of taxi drivers regarding different aspects of their careers that could clarify the psycho-social process associated with traffic safety. For this purpose, we asked these questions during the interviews: 'tell me all about your typical day as a taxi driver.' 'What do you most like or dislike about your occupation?' 'How can it impact on your safe driving behaviors?' and probed with more in-depth questions.

Methodology and study design
The design of the study describes the phenomenological research and analyzes the data of the experiences of taxi drivers concerning the fundamental concepts of world life and meaning-making.

Phenomenological approach
The purpose of the phenomenological approach is to clarify specific issues, to identify the phenomenon through how its performers are perceived in that situation. This means gathering in-depth information and insights through qualitative inductive methods such as in-depth interviews, focused group discussions, and taking notes. Phenomenology is the study of experiences from the perspective of the individual, bracketing taken-for-granted assumptions, and the usual ways of understanding. Epistemologically, phenomenological approaches are based on personal knowledge and subjectivity and emphasize the importance of individual interpretation and perspective [25]. Phenomenology is to understand an individual's subjective experiences in order to gain insight into their motivations and actions. Which is the aim of our study design that is exploring the subjective experiences and underlying feelings of the participant in order to discover their potential influence on taxi drivers' motivation and subsequent behaviours? So the approach of qualitative methodology seems the most appropriate method for the study.
The thought of world life is essential in phenomenology and means being in the world. Accordingly, the phenomenological approach to science and research is to describe the world as experienced by humans and how humans relate to this world, to each other, to different situations, and everything else possible in the world. It means that human life can be described in terms of experiences [26]. The approach of world life was adopted to design the present study.
Interview, as a method of data gathering, makes it possible to demonstrate human attitude and openness [26]. In order to understand the experiences of taxi drivers through interviews, the analysis of the results refers to the concept of existence and being in the world (DASEIN) as a taxi driver and attempts to describe their ordinary day-to-day life. This phenomenological knowledge not only provides an understanding of the natural attitude to things, and how things appear to the individual, but also provides a second analytical step to the way things are experienced as a phenomenon [26]. The phenomenon is the structure of the underlying meanings that illustrates the studied phenomenon of being a safe taxi driver. So we are looking for patterns of meanings of experiences, and we want to bring the meaning of the phenomenon (being a safe taxi driver) into the spotlight, which is analyzed, combined, and presented in the results section of the study. Dahlberg (2006) used the word bridling to mean limiting researchers' presumptions (in the form of individual beliefs, theories, and other assumptions that mislead their perceptions), thereby facilitating openness to new information. Bridling is about how a phenomenon and its meanings are revealed. Thus, Bridling proposes a phenomenological approach that encourages the researcher to wait for the phenomenon to show itself to the researcher [27]. In our reports on being a safe taxi driver, we must describe the whole structure and its components. Moreover, there is no other methodology, expect phenomenology, to study how being a safe taxi driver.

Procedural considerations
The interviewer (MM), who had less experience in interviewing, received professional training. Then, MM interviewed a friend under the supervision of the expert team to get a sense of how an interview should behold. The interviewer (MM) then applied the interview to four other respondents. The experts observed the interviewer's performance during these trial runs and, finally, when the interview flow was accepted, the interviewer assigned to the fieldwork.
As it is usual in phenomenology, this study has begun with exploring the experiences of taxi drivers in driving practice. Thus, participants were recruited as volunteers from the Taxi Management Organization (TMO) in Zanjan. Thus, there was no previous acquaintance between the interviewer and the participants of the study. In order to have a different perspective, a purposeful sampling strategy was employed. Also, we tried to have a varied group of age and education levels participants. The volunteered taxi drivers were invited to be interviewed. It should be mentioned that taxi drivers who were in a rush and had a tight schedule refused to be volunteers.

Ethical considerations
Informed consent was obtained from each taxi driver who participated in the study. Then, the purpose of the study was described for the participants and ensured participants about the anonymity and confidentiality of the information. Then, the interviews were started based on three main open-ended and non-directive questions, which were followed by appropriate probe questions. Assuredly, the participants were free to leave the study whenever they wanted (i.e., feeling uncomfortable or tired). By the end of the interview, each driver was paid an incentive-based on the driving time devoted to the study (10-20 thousand Rials).

Participants
In Zanjan, there were no Ride-Hailing Apps for calling taxis; hence, people took taxis through the traditional system of ridesharing or booking. As taxi drivers hailed on-street spent more time in traffic, and the use of this type of taxis was more common in the city, such taxi drivers were chosen for the study. All of these taxi drivers in Zanjan were male, and therefore, the 17 participants, including 11 participants of in-depth interviews, and 6 participants of focus group discussions, were all male. Participants' ages ranged from 23 to 54 (M = 41.76, SD = 8.64). Their minimum work experience as taxi drivers was two years, and the maximum was 29 years (M = 14.05, SD = 8.65). The participants' demographic characteristics are shown in Table 1.

Data collection
In phenomenology, the focus is not on the world but the person experiencing the world. Therefore, it is essential to know how participants experience the world or any particular subject or situation. In this study, researchers are interested in the subjective experiences of taxi drivers about being a safe taxi driver. Thus, the researcher attempted to bring the participants to a stage where they reflected on their past experiences and told the researchers about emotions, expectations, fears, thoughts, and stimuli selection [28]. According to Hycner (1985), who stated: "the phenomenon dictates the method including even the type of participants." [29], we chose purposive sampling, we recruited participants who had firsthand experiences about the phenomenon. We selected the taxi drivers based on those who "have had experiences relating to the phenomenon to be researched" [30]. For getting in-depth information, the data were collected using both semi-structured in-depth interviews and focus group discussions with taxi drivers. It should be noted that both the Semi-structured in-depth Interviews (IDIs) and Focus group discussion (FGD) guide used in present study were developed for this study. The interviewing processes are described in detail in additional file 1.

Semi-structured in-depth interviews (IDIs)
In order to get in-depth information, 11 IDIs were conducted to understand the taxi drivers' cognitive experiences associated with traffic safety. Demographic characteristics of taxi drivers participated in IDIs are shown in Table 2. For the sake of the participants' convenience, the interviews were conducted in a private place. During the interviews, the interviewer pays attention to the facial gestures and body language of the participants, and when it was required, she asked clarifying questions and wrote them in a notebook for further consideration in data analysis. Interviews lasted for approximately 22-87 min (M = 57.72 min). The time of each IDI depended on the participants' willingness to share his experiences, their speech about the range of essential things, which enabled the interviewer to probe on the more exciting and invariably sensitive issues. Hence based on the mentioned variables, there were differences in the interviews' duration. The participants' responses were recorded by a voice recorder (Voice Recorder Olympus DS-2400) and, subsequently, transcribed verbatim. Data collection, via IDIs, was done until each concept became saturated, and new themes ceased to emerge.

Focus group discussion (FGD)
Following semi-structured interviews, MM conducted an FGD to validate the themes that had previously emerged and get a deeper understanding of the themes related to the subjective experiences of taxi drivers on traffic safety issues. Demographic characteristics of taxi drivers participated in FGD are represented in Table 3. The FGD was held in a room near to TMO with six taxi drivers attending, which lasted for 110 min. All of the themes that emerged from IDIs were confirmed, and no new information was obtained, and as additional coding was no longer possible, data collection was ended.

Data analysis
The methodology of phenomenological approaches of Colaizzi (1978) [31] and Braun et al. (2006) [32] were combined, and an integrated seven-step data analytical approach was adopted: 1) First, the researchers dwelled with the data. Dwelling with data involved listening to recordings, transcribing them verbatim, and finally reading and rereading the transcripts. 2) Then the significant statements that pertained to the studied phenomenon were extracted. 3) In the third step, the meanings of these statements were written. 4) The codes were assigned to these meanings. Double coding was used so that researchers independently assigned pre-specified codes to the data. Once the coding structure became well-defined, the study proceeded by coding the remaining transcripts [33]. In this step, both methods of manual and electronic coding were used, such that, in the initial coding phase, the manual coding was used.
Once the coding structure became well defined, the interviewer entered the transcripts into MAXQDA software (version 10), which allows text to be coded and retrieved for ease of interpretation. 5) Then the codes were arranged in a systematic order. At the end of this stage, sub-categories, categories, and themes emerged. 6) When potential themes emerged, the researchers refined those themes. Refinement involved omitting the themes that were not well-defined, integrating some relevant  Taxi driver 15 45 high school 16 25 Taxi driver 16 40 Junior high school 12 20 Taxi driver 17 56 Reading and writing 29 33 themes, breaking down holistic themes into separate ones. 7) Finally, after a collection of fully-developed themes emerged, an attempt was made to report the results as below. Some strategies were used in order to increase the validity, reliability, and generalizability of this study. In order to increase the validity of the study, bracketing was used; also the researchers used triangulation or integration of the data source in a way that data were collected using two methods of in-depth interviews (IDIs) and focus group discussion (FGD). In order to increase reliability, researchers' triangulation was employed, with multi-disciplinary experts working together on coding, constant data comparison, and data analysis. The researchers also used theory triangulation so that results were confirmed and supported by various theories, which in turn added to the generalizability of the study.

Results
Seventeen taxi drivers (23 to 54 years) took part in the study. Overall, four major themes emerged from the analysis, including traffic chaos, social prestige, economic pressure, and job satisfaction. More information on themes and categories are represented in Table 4. However, in the following section, we present the taxi drivers' experiences on significant themes.

Traffic chaos
One of the elicited themes in the present study was traffic chaos, including three different categories, namely general non-compliance with traffic rules, improper traffic management, and workplace violation.
Taxi drivers referred to a complex traffic environment with a combination of different road users and vehicles. They said that sometimes motorcycles, bicycles, pedestrians, buses, and other cars created a dangerous situation for them. All of the participants reported high noncompliance with road traffic rules among road users. Most of the taxi drivers complained about traffic congestion, which caused them many problems such as massive losses of time, fuel, and income, fatigue, and even traffic safety hazards. It seemed unsuitably planned road networks resulted in the presence of areas that were hot spots of congestions, and low compliance with traffic rules by road users and inadequate traffic management around these hot spots exacerbated and extended traffic jams. Some of the taxi drivers believed that undeveloped infrastructures, as well as an increasing number of vehicles, were other contributing factors to these traffic jams. Almost all the participants declared that taxi drivers did not have any privilege over the other drivers. For example, there were no special taxi lanes in most parts of the city. They claimed that this problem alone could exacerbate traffic jams because there was no differentiation between taxis and personal cars. Therefore, people found it was more convenient to use their cars, which, in turn, resulted in more traffic congestion. They announced that the low capacities of taxi stations were enough for only a few taxis. Consequently, most of the taxi drivers had to pick up or drop passengers out of these stations. The participant also declared that Zanjan was famous as a city without parking; they said people parked their cars on both sides of narrow streets, and making them narrower. Committing violations was repeatedly mentioned by the participants during interviews. It was occasionally claimed that all of the taxi drivers committed a violation. However, some participants excluded themselves. The participants believed that traffic violation was the result of several factors, including traffic congestion, being humiliated by other road users, having a conflict with colleagues, unauthorized passengercarrying cars, passengers' fare evasion, road-rule violation by pedestrians and motorists. From their point of view, calmness was a prerequisite of safe driving and job satisfaction. 'Calmness has a positive correlation with safe driving. If a driver finds himself getting angry and upset on the road, he will not drive safely, but if he feels calm, he will pay attention to the road [P4a49 (IDI)].' 'I have seen several times on the streets that a verbal altercation between drivers results in an accident [P5a35 (IDI)].'

Social prestige
It seems that the low social status of taxi drivers (about their occupation) placed a further burden on the participants' psychological space. Fifteen participants said some of the passengers, people, and other drivers treated them disrespectfully, which made them feel distressed, annoyed, humiliated, and repressed. Some drivers reported that sometimes it could result in aggressive behaviour or verbal conflict, which were accompanied by distraction and could expose the driver and, as well as, the passengers to risk of being involved in an accident. Taxi drivers declared that their job had not been recognized as a real occupation in society. They complained about TMO and other related organizations not supporting them. For example, they stated that, in the last two years, the organization had not paid novice taxi drivers' medical or life insurance. Nearly all the participants were dissatisfied with the performance of the relevant organizations in controlling private cars that picked up passengers (unauthorized passenger-carrying cars), which endangered their job security.

Job satisfaction
Nine participants stated that they experienced heavy psychological burdens due to job stressors, which, in turn, affected their job satisfaction. They addressed some job stressors, such as rushing to meet efficiency demands, economic concerns, family issues, and long working hours.
'Drivers should be able to manage the time to not rush into the day that helps them to be more tranquil The other discontent that the participants referred to was low job motivation. It appears that the participants were not satisfied with their job. Because they said, they would not recommend it to anyone else. Also, some of the participants did not even consider their job to be a real occupation. Some of the participants believed that their job made them feel their life like hell! 'I do not recommend this job. You cannot consider it as a real job [P11a46 (IDI)].' 'The worst job, the poorest job in the city, is ours. I apologize to my colleagues, but with the humiliating looks of people around, it seems it is the worst occupation in the city [P13a53 (FGD)].'

Economic pressure
Economic issues were the primary concern of the participants. Almost all the participants said that economic issues caused them many problems such as stress, distraction, tenderness, and forced them to work long hours. They also claimed that economic concerns played a significant role in traffic safety insofar as they knew their economic concerns to be the leading cause of accidents. They firmly pointed out the experience of financial stress as a result of the combination of occupational expenses and the economic crisis in society.
Participants stated that occupational expenses included car insurance, fuel, renewal of commercial passenger vehicle identity (CPV ID) card, the extra cost for car maintenance and repairs due to low quality national products. The taxi drivers also complained about their low level of income, which caused a feeling of imbalance between income and expenses.
'We cannot afford the necessary maintenance and repair work. We also use our tires until they get completely flat; these things, in turn, can reduce the safety level of the car [P5a35 (IDI)].' 'From the morning that we start working, we have stress regarding whether we will be able to earn the required income or not [P2a47 (IDI)].' Participants referred to the high cost of living and the existence of inflation in the community. They said there was an unemployment crisis in the country that had caused vast numbers of people to turn to carry passengers with their private cars. Consequently, high competition for passengers, along with struggling to meet efficiency demands, may result in more considerable speeding and risk-taking that could constitute potential safety problems.
'For example, yesterday, I picked up three passengers, one of my colleagues, who parked ahead of me in the queue, protested for picking them up; he claimed that they were his passengers; despite telling him, they chose to take my car. Then, he started the next car angrily such that my passengers were scared and asked me to stop in a police station [P2a47 (IDI)].'

Discussion
This study was designed to explore the possible impact of taxi drivers' feelings about their occupation and work circumstances on the subsequent driving behaviors. As a result, several core concepts, including traffic chaos, social prestige, economic pressure, and job satisfaction, emerged.

Traffic chaos
Being confounded in traffic conditions were mentioned again and again by the participants. This experience brought them a feeling of anarchy. During interviews they frequently referred to issues such as weak infrastructure (narrow streets against increasing number of vehicles, lacking parking, and lack of taxi lanes), traffic congestion, and a complex traffic environment with a combination of different road users and vehicles (i.e. motorcycles, bicycles, pedestrians, buses, and other cars). Mohan et al. (2000) mentioned the same circumstances in developing countries [34]. While Shefer et al. (1997) acknowledged traffic congestion due to a positive effect on the reduction of vehicles' speed [35], Shams et al. (2011) quoted in traffic jam, taxi drivers tried to escape in order to save their time, which was usually resulted in risky driving [14].
Besides, Mohan et al. (1999) conducted a study in Delhi and concluded that different modes of transport (including non-motorizes and motorized vehicles and walking) shared the same road space. For that reason, the smooth flow of traffic in all lanes was disturbed, and a sub-optimal of transportation emerged for all modes, which resulted in a hazardous traffic environment [36] the countermeasures in developed countries usually modeled roads and intersections in computer programs for only traveling vehicles. Then, the same programs were applied in developing countries which, in contrast, had other modes of transport in the same road space. Therefore, it is not unexpected that traffic problems will persist [34].
As seen, several researchers, who studied traffic problems, recognized the relationship between hazardous traffic conditions and traffic chaos. However, the experience and feeling of traffic chaos can manifest in unsafe driving, too. Some studies referred to risky driving due to traffic congestion [14].

Social prestige
In this study, it seems that taxi drivers considered themselves at a low social status in a hierarchical society. Since taxi drivers believed people usually disrespectfully treated them, they felt humiliation. Then, as a psychological reaction, they found themselves to be ready to take retaliatory steps in self-defence. According to the Schwartz value dimension scores, Iran, accompanied by Thailand, has the world's second-highest score in the hierarchy among 80 countries [37] may explain the relative importance of social status to the participants. Moreover, Harsanyi (1966) highlighted that "apart from economic payoffs, social status seems to be the most important incentive and motivating force of social behaviour" [38]. In our study, participants pointed out that the responding against insulting comments would endanger the driver and occupants. Henry (2009) demonstrated that people of a low-status had a higher tendency for violent behaviour and responded fast to personal threats and insults because they are much more sensitive to being socially rejected and are more inclined to protect their sense of self-worth. Henry explained these differences in terms of a "low-status compensation theory." [39].
Assuming themselves to be low-status individuals may cause taxi drivers to be more prone to lose their temper when they were provoked. As stated before, the participants repeatedly reported getting angry behind the wheels. Getting angry is one of the most critical risk factors while driving. Dingus et al. (2016) found that driving while angry increases the risk of crashes nine times compared to normal driving. In comparison to texting behind the wheel, angrily driving was five times more likely to result in a crash [40]. These findings of the current study are consistent with those of Shaikh et al. (2012), who found that road rage was very common among the Pakistani commercial vehicle drivers [41]. Also, another study conducted on taxi drivers in South Africa showed that taxi drivers were statistically more likely to engage in aggressive driving behaviors than other drivers. The researchers justified their findings, using frustration and aggression (F-A) theory. The theory links aggression to frustration, describing that experiencing a frustrating situation, behavior, or events precipitate aggressive driving behaviors [42].
Thus, it can be concluded that, by our findings, different theories confirmed low social prestige and feeling humiliated can cause frustration and aggression among taxi drivers and lead them to demonstrate dangerous driving behaviors.

Job satisfaction
The participants disappointed by the cost of low social status, low income, and improper job environment; …in their job. Lee, An, and Noh (2012) found similar factors for job dissatisfaction in their study [43]. The participants in the present study judged on the material and spiritual costs of their job in a manner that they usually experienced receiving imbalance rewards. The feeling of this kind of imbalance induced the feeling of job dissatisfaction in taxi drivers. However, they endured job dissatisfaction because they had somehow experienced unemployment and believed there were no alternative jobs. This kind of feeling caused them to exhibit dangerous driving behavior. These findings can be well described using investment theory introduced by Farrell et al. (1981), which demonstrated that the investment model could predict job satisfaction based on costs and rewards, as well as employees' emotions to the characteristics of the job. In sum, they implied a relationship between the variables of the investment model and unsafe behaviors causing accidents [44]. Also, Aziri (2011) found that job dissatisfaction can be related to unsafe behaviors and may raise the number of work-related accidents [45]. Moreover, a study conducted on Japanese commercial drivers showed a negative correlation between drivers' job satisfaction and safety outcomes, such as the rate of accident injuries [46].

Economic pressure
Although the participants alluded to economic pressure as an underlying factor to job satisfaction, they further remarked this theme as an independent element influencing on their driving behaviors. The participants delineated an atmosphere overfilled of financial stress, which caused them being distracted or anxious. Distraction as a result of stress has been wholly discussed in attention control theory (ACT) [47]. This theory well explains the stress effects on cognitive performance detrition. In line with this theory, anxiety reduces the available resources to control attention. Subsequently, those executive functions which are dependent on attention control can be impaired [48]..
Anxiety was the other outcome of the financial stress, which was mentioned by the taxi drivers, which manifested in over-speeding, passing through the red light, unauthorized overtaking, weaving through traffic, and tailgating. In plenty of studies, anxiety and its behavioral outcomes were discussed. For example, Useche et al. (2018) showed that job stress was one of the most potent factors in predicting traffic accidents of occupational drivers in Colombia [7]. Also, Hofmann and Stetzer (1996) stated that employees who experienced job stress focused on task efficiency rather than safety. Because they believed the more task efficiency, the more income, and rewards [49], in the present study, the participants considered efficiency as more passengers to be carried as fast as possible. In such a way, they did their best to catch more passengers in the shortest time continually. It can be translated into committing some violations, as mentioned before.

Study strength and limitations
A few limitations exist in the current study. First, as an inherent limitation in qualitative studies, the results have been limited based on research design. Thus, one should be prudent in the generalization of the findings to other populations. In order to address this kind of limitation, we recruited a heterogeneous sample, according to the level of education, age, and work experience.
Second, because of the long working hours and tight schedule of taxi drivers, the transcripts were not returned to the participants for comments, nor were the participants asked to provide feedback on the findings. However, we endeavoured to overcome this limitation by conducting a focus group discussion that could explicate and validate the information obtained from individual interviews.
In order to increase the strength and validity of the study, the authors used three types of triangulation, namely data triangulation, investigator triangulation, and theory triangulation. In data triangulation, the researchers used two types of data collection methods, which included IDI and FGD. The convergence of data from two data collection methods added to the reliability of the findings. Investigator triangulation involved the participation of three researchers in the study for the analysis and interpretation of the data. This triangulation helps confirmation of the findings and the emergence of the various perspectives that widen the studied phenomenon. Finally, theory triangulation was applied such that various theories were used to analyze and interpret the results. Ultimately, we checked all steps of performing the study based on the CASP qualitative checklist [50].

Conclusion and implication
As the study was planned to discover subjective experiences and feelings of taxi drivers regarding their driving behavior and traffic safety, four main themes were discovered as traffic chaos, social prestige, economic pressure, and job satisfaction.
The contribution of this article will be discussed concerning conceptual and general practical implications. The result of the existential dimensions of being a taxi driver is highlighted as a new understanding of the subjective experiences and feelings of taxi drivers about their occupation with a safety orientation.

Conceptual implications
The analysis contributed to an understanding of how taxi drivers' feelings about their occupation and work circumstances could impact safe driving behaviours. Hence, "phenomenology of being a taxi driver" expresses taxi drivers' feelings and experiences of being existentially touched. Heidegger looked at DASEIN (man) as a being-in-the-world. He considered DASEIN about others, and he emphasized a threefold structure of existence (being in, the world, and the self) [51]. In the present study, the threefold structure of existence included taxi drivers' (the self) feelings and experiences of being under pressure of traffic chaos (the world), low social prestige, economic pressure, and job dissatisfaction (being in) in our study.

Practical implications
This study described taxi drivers' professional experiences as well as safety-related problems they routinely faced on. The four main themes of the experiences were traffic chaos, social prestige, economic pressure, and job satisfaction. It means, to motivate taxi drivers to be safe, these themes should be regarded as barriers that have to be removed. Thus, strategic planning for traffic safety should include these barriers elimination.
Supports for taxi drivers that would result in greater tranquillity and reduced occupational stresses were emphasized. Reduction of traffic chaos, which may result in more traffic safety, can be achieved via improvements in urban sub-structures, such as increasing the capacity of taxi stations and urban infrastructure renovation. Inappropriate road networks in many developing countries create areas that are familiar places of traffic jams. However, proper traffic management can reduce such problems to some extent.
Besides, more stringent traffic enforcement will motivate taxi drivers to comply with traffic rules. As well, a series of social programs is required to facilitate financial success for taxi drivers. Stricter traffic enforcement and appropriate traffic safety training for the various sections of the community, including pedestrians and other road users, can be useful in creating a safer traffic space and reducing traffic chaos in the community.
Additional file 1. Interview guideline. A guideline about the steps of conducting the In-depth interviews and focus group discussion.