Research & Evaluation
Behavioral Research
Behaviors and Attitudes
NHTSA studies behaviors and attitudes in highway safety, focusing on drivers, passengers, pedestrians, and motorcyclists. We identify and measure behaviors involved in crashes or associated with injuries, and develop and refine countermeasures to deter unsafe behaviors and promote safe alternatives.
Our recently published reports and research notes are listed chronologically below. To the right are additional resources including Traffic Techs.
| Title | |
|---|---|
Estimated Contribution of Peak-Hours Non-Commercial Vehicle Traffic to Fatality Rates, Research Note, Traffic Safety FactsThis Traffic Safety Facts Research Note explores the relationship between the decline in vehicle miles traveled (VMT) associated with the COVID-19 pandemic and the increased fatality rate observed for 2020. It hypothesizes that the fatality rate relative to previous years is due in part to a decrease in peak-hours (i.e. 6–9 a.m., 3–6 p.m.) non-commercial vehicle traffic – that is, a decrease in commuting. To draw comparisons with 2020 the author use the most recent National Household Travel Survey, Fatality Analysis Reporting System, and FHWA VMT data to estimate separate peak and non-peak, non-commercial vehicle fatality rates for 2017. The estimated peak-hours non-commercial vehicle fatality rate for 2017 was .5 per 100m VMT, while the non-peak hours non-commercial fatality rate was 1.27 per 100m VMT. Excluding peak-hours non-commercial vehicle traffic, 2017 had an overall fatality rate of 1.48 per 100m VMT. The fatality rate for 2020 was 1.34 per 100m VMT. The author therefore conclude that decreased peak-hours non-commercial vehicle traffic associated with the COVID-19 pandemic, stay-at-home orders, and increases in remote working contributed to 2020’s increased fatality rate relative to previous years. |
DOT HS 813 340 |
Understanding and Using New Pedestrian and Bicycle FacilitiesResearch has explored the benefits of innovative pedestrian and bicycle facilities, but it is unclear how pedestrians and bicyclists learn to properly use them. This report provides information on new pedestrian and bicycle treatments and (1) the behavior and knowledge of pedestrians, bicyclists, and drivers traversing through, on, and around the new facilities, and (2) law enforcement activity around the facilities. A systematic literature review as well as a review of current practices in outreach was conducted. |
DOT HS 813 317 |
Safety in Numbers: A Literature ReviewIn pedestrian and bicyclist safety, Jacobsen’s 2003 “Safety in Numbers” (SIN) theory posits an inverse relationship between the extent of walking and bicycling and the probability of motorist collisions. This literature review summarizes SIN research, identifying implications of the work chronologically, developing the SIN concept and subsequent work testing and expanding the theory. It considers study fields and areas of practice including engineering, planning and land use, sociology, psychology, education, public health, enforcement, human factors, and others. This breadth was especially important due to wide audience who may apply this review results to their future practice. These include State Highway Safety Offices, national organizations interested in the SIN topic, constituents from the FHWA, planners, engineers, educators, advocacy groups, policymakers, State DOTs, metropolitan planning organizations, and roadway users -- motorists, pedestrians, bicyclists -- and law enforcement. |
DOT HS 813 279 |
Risk Factors for Young Drivers in Fatal and Non-Fatal Crashes: Supplementary ReportThis is supplementary report accompanies the report titled, Risk Factors for Young Drivers in Fatal and Non-Fatal Crashes. |
DOT HS 813 303B |
Risk Factors for Young Drivers in Fatal and Non-Fatal CrashesThis report analyzed data from young drivers 16 to 20 years old from the Fatality Analysis Reporting System (FARS) years 2013 to 2017, and from the second Strategic Highway Research Program’s Naturalistic Driving Study (SHRP2 NDS). The data permitted a comparison of trends between age and amount of driving experience for a similar range of variables. Although young driver risk appeared to decline with increasing age, young drivers were at higher risk than 35-year-olds for most factors. Some situations were particularly risky for young drivers relative to 35-year-old and relative to other kinds of situations. The results from this study may be useful for developing graduated driver licensing as well as driver education content. |
DOT HS 813 303A |
Synthesis of Studies That Relate Amount of Enforcement to Magnitude Of Safety Outcomes - Technical AppendixThis is the Technical Appendix for the Synthesis of Studies That Relate Amount of Enforcement to Magnitude Of Safety Outcomes report, DOT HS 812 712-A. |
DOT HS 813 274-B |
Synthesis of Studies That Relate Amount of Enforcement to Magnitude Of Safety OutcomesThe National Cooperative Research and Evaluation Program (NCREP) identifies and funds research and evaluation projects that improve and expand State highway safety countermeasures. One such topic is measuring the impact of various amounts of traffic enforcement on changes in safety outcomes. The project team identified 80 relevant studies for inclusion in the synthesis. Current literature only supported findings related to occupant protection enforcement. No relationship between levels of enforcement and safety outcomes could be identified for distracted driving, alcohol-impaired driving, speeding, or aggressive driving. However, for all targeted behaviors, the enforcement campaigns evaluated were effective in improving safety outcomes even though the combination of these evaluations could not provide sufficient evidence to establish a relationship between the level of resources used and the magnitude of the safety improvement. |
DOT HS 813 274-A |
Research on Older Adults’ Mobility: 2021 Summary ReportThis report summarizes a meeting to spotlight research on older adults’ mobility held in January 2021– dubbed ROAM, Research on Older Adult Mobility – provided a forum to share news of completed research, report on the progress of ongoing studies, and highlight priorities for future work. Participants included medical professionals, occupational therapists, State DMV officials, mobility service provider specialists, automated driving system/advanced driver assistance system experts, and other academic and private sector research professionals. The meeting supported equity in traffic safety as it addressed disparities faced by older adults. |
DOT HS 813 317 |
Visual Scanning Training for Older DriversThis study examined the effectiveness of a visual scanning training program administered by an occupational therapist as an intervention to improve visual scanning performance of healthy older drivers. Participants included 89 licensed drivers age 70 and older. The training program consisted of four, 1-hour sessions. Participants completed three on-road evaluations: pre-intervention, immediately post-intervention, and 3 months post-intervention. During the evaluations a camera recorded driver face video to support later analyses of the frequency, duration, and direction of eye glances away from the forward line of sight. Analyses of driving data showed no significant differences between intervention and control groups on driving or glance measures. |
DOT HS 813 295 |
Estimating Motorcycle Miles Travelled from State Vehicle Inspection RecordsThis report summarizes a study that examined motorcycle miles traveled as indicated by odometer readings taken from vehicle inspection records. Estimating vehicle exposure is difficult for any type of vehicle, and motorcycles are no exception. Motorcycle vehicle miles traveled (VMT) is based on traffic counts of sampled roadways supplemented with traffic modeling. This study sought to improve understanding by examining motorcycle odometer readings as measures of VMT in Hawaii, North Carolina, and Virginia. Results showed mean annual mileage per motorcycle was consistent year-to-year, and motorcycles were ridden about 2,000 miles each year. |
DOT HS 813 288 |