Investigation of the effect of short duration breaks in delaying the onset of performance related fatigue during long distance monotonous driving at different times of the day
- Authors: Ndaki, Ntombikayise
- Date: 2012
- Subjects: Fatigue -- Physiological aspects , Drowsiness -- Physiological aspects , Automobile driving -- Physiological aspects , Traffic safety -- South Africa , Automobile driving -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5170 , http://hdl.handle.net/10962/d1016353
- Description: Road traffic accidents are a serious burden to the health systems of many countries especially in South Africa. Research aimed at reducing traffic related accidents is of importance as traffic crashes are rated as the second leading cause of fatalities in South Africa and ninth in the world. Despite the extensive efforts into research and development of new technology, driver fatigue still remains a cause of vehicle accidents worldwide. Fatigue plays a role in up to 20% of vehicle accidents with many being serious or fatal. Numerous coping behaviours are employed by drivers to counteract the negative effects of fatigue. The most common coping behaviours include taking short naps, talking to passengers, listening to the radio, opening windows and drinking stimulants. Driving breaks have long been identified as an effective countermeasure against fatigue. Most research done in driving breaks has investigated the duration of the breaks, activity undertaken during the break and the frequency of the breaks taken outside the vehicle. However limited literature is available on the effectiveness of breaks in counteracting the effects of fatigue. The objective of the current study was aimed at assessing whether short duration breaks are an effective countermeasure against fatigue. Physiological, neurophysiological, subjective and performance measures were used as indicators for fatigue. Additional focus of the research was determining whether breaks were more or less effective at counteracting the effects of fatigue at different times of day. Twelve participants were recruited for the study, six males and six females. The participants were required to perform a driving task on a simulator for 90 minutes. The study consisted of four independent conditions, namely driving during the day with breaks, driving during the day without breaks, driving during the night with breaks and driving during the night without breaks. The without breaks conditions were similar except that they occurred at different times of the day, one session at night and the other session during day time, as was the case for the conditions with breaks. The driving task used in the current study was a low fidelity simulator tracking task. The participants were required to follow a centre line displayed on a tracking path as accurately as possible. The measurements that were recorded in this study included physiological, performance, subjective and neurophysiological. Physiological measures included heart rate and heart rate variability (frequency domain) and core body temperature. The ascending threshold of the critical flicker fusion frequency was the only neurophysiological measurement included in the current investigation. Performance was quantified by mean deviation from a centre line participants were meant to track. Two rating scales were used: Karolinska sleepiness scale and the Wits sleepiness scale were used for the measurement of subjective sleepiness. Heart rate, heart rate variability and mean deviation were measured continuously throughout the 90 minute driving task. Critical flicker fusion frequency, temperature and the subjective scales were measured before and after the 90 minute driving task. The results indicated that the short duration breaks during day time had a positive effect on driving performance; however the breaks at night had a negative effect on driving performance. Heart rate was higher during the day compared to night time and the heart rate variability high frequency spectrum values were lower during the day condition, to show the activation of the sympathetic nervous system which is characteristic of day time. The night conditions had lower heart rate values and higher heart rate variability high frequency values, which show the activation of the parasympathetic nervous system which is dominant during periods of fatigue and night time. Subjective sleepiness levels were also higher at night compared to day time.
- Full Text:
- Date Issued: 2012
- Authors: Ndaki, Ntombikayise
- Date: 2012
- Subjects: Fatigue -- Physiological aspects , Drowsiness -- Physiological aspects , Automobile driving -- Physiological aspects , Traffic safety -- South Africa , Automobile driving -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5170 , http://hdl.handle.net/10962/d1016353
- Description: Road traffic accidents are a serious burden to the health systems of many countries especially in South Africa. Research aimed at reducing traffic related accidents is of importance as traffic crashes are rated as the second leading cause of fatalities in South Africa and ninth in the world. Despite the extensive efforts into research and development of new technology, driver fatigue still remains a cause of vehicle accidents worldwide. Fatigue plays a role in up to 20% of vehicle accidents with many being serious or fatal. Numerous coping behaviours are employed by drivers to counteract the negative effects of fatigue. The most common coping behaviours include taking short naps, talking to passengers, listening to the radio, opening windows and drinking stimulants. Driving breaks have long been identified as an effective countermeasure against fatigue. Most research done in driving breaks has investigated the duration of the breaks, activity undertaken during the break and the frequency of the breaks taken outside the vehicle. However limited literature is available on the effectiveness of breaks in counteracting the effects of fatigue. The objective of the current study was aimed at assessing whether short duration breaks are an effective countermeasure against fatigue. Physiological, neurophysiological, subjective and performance measures were used as indicators for fatigue. Additional focus of the research was determining whether breaks were more or less effective at counteracting the effects of fatigue at different times of day. Twelve participants were recruited for the study, six males and six females. The participants were required to perform a driving task on a simulator for 90 minutes. The study consisted of four independent conditions, namely driving during the day with breaks, driving during the day without breaks, driving during the night with breaks and driving during the night without breaks. The without breaks conditions were similar except that they occurred at different times of the day, one session at night and the other session during day time, as was the case for the conditions with breaks. The driving task used in the current study was a low fidelity simulator tracking task. The participants were required to follow a centre line displayed on a tracking path as accurately as possible. The measurements that were recorded in this study included physiological, performance, subjective and neurophysiological. Physiological measures included heart rate and heart rate variability (frequency domain) and core body temperature. The ascending threshold of the critical flicker fusion frequency was the only neurophysiological measurement included in the current investigation. Performance was quantified by mean deviation from a centre line participants were meant to track. Two rating scales were used: Karolinska sleepiness scale and the Wits sleepiness scale were used for the measurement of subjective sleepiness. Heart rate, heart rate variability and mean deviation were measured continuously throughout the 90 minute driving task. Critical flicker fusion frequency, temperature and the subjective scales were measured before and after the 90 minute driving task. The results indicated that the short duration breaks during day time had a positive effect on driving performance; however the breaks at night had a negative effect on driving performance. Heart rate was higher during the day compared to night time and the heart rate variability high frequency spectrum values were lower during the day condition, to show the activation of the sympathetic nervous system which is characteristic of day time. The night conditions had lower heart rate values and higher heart rate variability high frequency values, which show the activation of the parasympathetic nervous system which is dominant during periods of fatigue and night time. Subjective sleepiness levels were also higher at night compared to day time.
- Full Text:
- Date Issued: 2012
An analysis of the views of Minibus Taxi drivers and commuters to road safety : a case study of the Northern Areas of Port Elizabeth
- Authors: Ferreira, Bernice Aloma
- Date: 2010
- Subjects: Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8191 , http://hdl.handle.net/10948/1402 , Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Description: People without private transport are dependent on public transportation. Public transport, particularly minibus taxis, is the most popular mode of transport in the Northern Areas of Port Elizabeth. The objective of the minibus taxi industry is to provide public transport to minibus taxi commuters in an economically, reliable and safe manner. The focus of this case study was to explore and determine the views of minibus taxi commuters who utilised minibus taxis as a form of public transport, as well as the views of minibus taxi drivers in terms of adhering to road safety requirements on Stanford Road in Port Elizabeth. The literature survey revealed that transport in South Africa has had a political dimension arising from the Group Areas Act 41 of 1950. One consequence of this Act, which imposed residential segregation on the country, was that poor black commuters were forced to live far out of town, forcing them to travel long distances to places of work and commercial centres, with a commensurate increase in transport costs. Data was collected by means of two structured questionnaires which were administered to minibus taxi drivers and minibus taxi commuters to explore their views and experience of road safety on Stanford Road in Port Elizabeth. A discussion on the minibus taxi industry, minibus taxi associations and law enforcement agencies in Port Elizabeth, as well as the sustainability of the minibus taxi industry, followed in Chapter Three. Through this case study, valuable insight was gained regarding the minibus taxi industry and road safety in Port Elizabeth. Finally, recommendations to improve road safety were made.
- Full Text:
- Date Issued: 2010
- Authors: Ferreira, Bernice Aloma
- Date: 2010
- Subjects: Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8191 , http://hdl.handle.net/10948/1402 , Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Description: People without private transport are dependent on public transportation. Public transport, particularly minibus taxis, is the most popular mode of transport in the Northern Areas of Port Elizabeth. The objective of the minibus taxi industry is to provide public transport to minibus taxi commuters in an economically, reliable and safe manner. The focus of this case study was to explore and determine the views of minibus taxi commuters who utilised minibus taxis as a form of public transport, as well as the views of minibus taxi drivers in terms of adhering to road safety requirements on Stanford Road in Port Elizabeth. The literature survey revealed that transport in South Africa has had a political dimension arising from the Group Areas Act 41 of 1950. One consequence of this Act, which imposed residential segregation on the country, was that poor black commuters were forced to live far out of town, forcing them to travel long distances to places of work and commercial centres, with a commensurate increase in transport costs. Data was collected by means of two structured questionnaires which were administered to minibus taxi drivers and minibus taxi commuters to explore their views and experience of road safety on Stanford Road in Port Elizabeth. A discussion on the minibus taxi industry, minibus taxi associations and law enforcement agencies in Port Elizabeth, as well as the sustainability of the minibus taxi industry, followed in Chapter Three. Through this case study, valuable insight was gained regarding the minibus taxi industry and road safety in Port Elizabeth. Finally, recommendations to improve road safety were made.
- Full Text:
- Date Issued: 2010
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