An on-road study to investigate fatigue in local/short haul trucking.
ABSTRACT As a precursor to the present research, Hanowski et al. [FHWA Report no. FHWA-MC-98-029. Office of Motor Carriers, Federal Highway Administration, Washington, DC, 1998] conducted a series of focus groups in which local/short haul (L/SH) drivers provided their perspective on safety issues, including fatigue, in their industry. As a follow-up to the Hanowski et al. work, the effort presented here consisted of an on-road field study where in-service L/SH trucks were instrumented with data collection equipment. Two L/SH trucking companies and 42 L/SH drivers participated in this research. The analyses focused on determining if fatigue is an issue in L/SH operations. Of primary interest were critical incidents (near-crashes) where L/SH drivers were judged to be at fault. The results of the analyses indicated that fatigue was present immediately prior to driver involvement in at-fault critical incidents. Though it is difficult to determine with certainty why fatigue was present, the results suggest that drivers' off-hours behavior likely played a significant role in the fatigue experienced on the job. Another key finding of this research is that a small percentage of drivers were responsible for a majority of the critical incidents. This finding suggests that driver selection and monitoring could potentially improve safety in L/SH operations.
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ABSTRACT: Driver fatigue has been a major contributing factor to fatal commercial truck crashes, which accounted for about 10% of all fatal motor vehicle crashes that happened between 2009 and 2011. Commercial truck drivers' safety performance can deteriorate easily due to fatigue caused by long driving hours and irregular working schedules. To ensure safety, truck drivers often use off-duty time and short rest breaks during a trip to recover from fatigue. This study thoroughly investigates the impacts of off-duty time prior to a trip and short rest breaks on commercial truck safety by using Cox proportional hazards model and Andersen-Gill model. It is found that increasing total rest-break duration can consistently reduce fatigue-related crash risk. Similarly, taking more rest breaks can help to reduce crash risk. The results suggest that two rest breaks are generally considered enough for a 10-hour trip, as three or more rest breaks may not further reduce crash risk substantially. Also, the length of each rest break does not need to be very long and 30min is usually adequate. In addition, this study investigates the safety impacts of when to take rest breaks. It is found that taking rest breaks too soon after a trip starts will cause the rest breaks to be less effective. The findings of this research can help policy makers and trucking companies better understand the impacts of multiple rest-break periods and develop more effective rules to improve the safety of truck drivers.Journal of safety research 02/2014; 48C:87-93. · 1.34 Impact Factor
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ABSTRACT: Abstract (background, aim, method, result) max 200 words: This is a methodological,paper with the aim to discuss pros and cons related to different tools and
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ABSTRACT: Two decades of research has established a correlation between tiredness and fatigue, and traffic accident involving truck drivers. Regulations limiting the driving hours of truck drivers thus are necessary precautions. But compliance is a problem. The answer from authorities tend to be disciplinary measures, leading to protests or strikes among the drivers, and an uncooperative climate. This paper offers an insight into 16 truck driversdaily practices and strategies towards the European regulation 651, based on a longish ethnographical field study in a Danish haulage company. The results points to six reasons why the regulations might be violated. The first is that driving time is respected, but resting time is not, which in effect means that the drivers experience the restraining part of the regulation, but not the protection from exploration that it also contains. The second reason is that the regulation seems to be designed to long distance driving, and has some short-comings when applied to short distance drivers. The third reason is that the regulation deprives the drivers of means to control their tiredness. The fourth reason is that the regulation limits room for planning ahead generally, because a truck driver's work is unpredictable and independent, but the regulation is action-defining and inflexible. Thus the regulations provoke violations because they counteract with the reality of truck driverswork conditions. The fifth reason is that the regulation counteracts with a general independency ideal among truck drivers. The last reason is that the drivers and their employers share an interest in long work hours.