Now showing items 1-20 of 121

    • 100-car reanalysis: summary of primary and secondary driver characteristics 

      McClafferty, Julie A.; Hankey, Jonathan M. (National Surface Transportation Safety Center for Excellence, 2010-08-27)
      This project's goal was to build a complete trip file inventory for the 100-Car data set... Data points collected for each file include Driver ID (with new IDs created as new secondary drivers were found), Ambient Lighting, ...
    • 4U Lighting – Cooperative Headlighting 

      Palmer, Matthew; Tsuda, Hiroshi; Williams, Brian M.; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2019-10-31)
      The purpose of this project was to evaluate the effectiveness of an alternative cooperative headlighting method, dubbed 4U Lighting. A human-subjects study was conducted in which 12 participants 65 or older observed ...
    • Active and Adaptive Roadway Delineation Systems 

      Williams, Brian M.; Gibbons, Ronald B.; Flintsch, Alejandra Medina (National Surface Transportation Safety Center for Excellence, 2017-10-13)
      Heavy fog presents a significant safety hazard to drivers by reducing their ability to see the roadway and other vehicles. Even so, drivers often fail to adjust their speed to account for the reduced visibility, resulting ...
    • Alcohol and Drug Testing: Informational Guidelines for Occupational Drivers 

      Glenn, T. Laurel; Camden, Matthew C.; Hickman, Jeffrey S. (National Surface Transportation Safety Center for Excellence, 2020-09-04)
      The Omnibus Transportation Employee Testing Act of 1991 requires all Department of Transportation (DOT) agencies to conduct drug and alcohol testing of safety-sensitive transportation employees, which includes commercial ...
    • Alcohol Intoxication Checklist: A Naturalistic Approach 

      Wotring, Brian; Antin, Jonathan F.; Smith, Ryan C. (National Surface Transportation Safety Center for Excellence, 2021-07-16)
      This effort sought to determine the prevalence of particular visual and behavioral indicators for alcohol intoxication using data collected in the Strategic Highway Research Program 2 Naturalistic Driving Study (SHRP 2 ...
    • Analysis of Car Cut-ins Between Trucks Based on Existing Naturalistic Driving Data 

      Sarkar, Abhijit; Engström, Johan; Hanowski, Richard J. (National Surface Transportation Safety Center for Excellence, 2022-03-21)
      For successful operation of cooperative adaptive cruise control, the participating vehicles follow certain operational criteria. For truck platooning, the participating trucks are required to maintain a minimum inter-vehicular ...
    • Analysis of Run-off-road Safety-critical Events in Virginia 

      Turturici, Marissa; Noble, Alexandria M.; Klauer, Charlie (National Surface Transportation Safety Center for Excellence, 2021-05-27)
      Run-off-road (ROR) crashes account for a large proportion of fatalities on U.S. roadways. ROR crashes usually involve a single vehicle and occur when the vehicle departs the roadway and then strikes an object. The research ...
    • Analyzing Intersection Gap Acceptance Behavior with Naturalistic Driving Data 

      Li, Yingfeng (Eric); Hao, Haiyan; Gibbons, Ronald B.; Medina, Alejandra (National Surface Transportation Safety Center for Excellence, 2022-09-14)
      Safety at unsignalized intersections continues to be a major concern for transportation agencies and roadway users. To improve intersection safety, this project conducted a comprehensive study of gap acceptance behaviors ...
    • Application of Proximity Sensors to In-vehicle Data Acquisition Systems 

      Krothapalli, Ujwal; Stowe, Loren; Doerzaph, Zachary R.; Petersen, Andy (National Surface Transportation Safety Center for Excellence, 2018-05-02)
      Naturalistic driving studies rely on human data reductionists to manually review and annotate driving behaviors. This work is time-consuming, and algorithms that could scan and categorize video data could make the data ...
    • Applying the Crash Trifecta Approach to SHRP 2 Data 

      Dunn, Naomi J.; Hickman, Jeffrey S.; Soccolich, Susan A.; Hanowski, Richard J. (National Surface Transportation Safety Center for Excellence, 2018-04-06)
      The crash trifecta model does not consider crash genesis as a simple unitary element, but rather as a convergence of three separate, converging elements: (1) unsafe pre-incident behavior or maneuver; (2) transient driver ...
    • Assessing the Safety Impact of Roadway Improvements Using Naturalistic Driving Data--Feasibility Study 

      Li, Yingfeng; Medina, Alejandra; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2017-10-19)
      This project explored the feasibility of using Second Strategic Highway Research Program (SHRP 2) data, including the Roadway Information Database (RID), to evaluate the effectiveness of roadway safety improvements where ...
    • The Assessment of Alternative Overhead Sign Lighting 

      Williams, Brian M.; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2020-07-22)
      This report evaluates an alternative method for lighting highway signs that takes advantage of their retroreflective properties. This method uses a single luminaire mounted some distance upstream of the sign, with a focused, ...
    • The Assessment of New Roadway Lighting in Rain and Fog 

      Williams, Brian; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2022-10-27)
      This study sought to determine if different types of roadway lighting performed differently in rain or fog. The performance of the lighting was determined by participants’ ability to detect different objects along the ...
    • An Assessment of Quiet Vehicles and Pedestrian and Bicyclist Safety 

      Alden, Andrew S. (National Surface Transportation Safety Center for Excellence, 2014-07-28)
      The primary intent of this report is to provide a comprehensive and concise overview of the apparent safety issues presented to pedestrians and pedalcyclists by the operation of quiet vehicles on roadways. The report ...
    • Assessment of the impact of color contrast in the detection and recognition of objects in a road environment: final report 

      Terry, Travis N.; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2011-12-16)
      With the development of new light sources, options for the color and spectral output of a luminaire are wider than for traditional light sources. This can impact visibility as the spectral output of a light source may have ...
    • Bicycle Visibility: Conspicuity of Bicycle Headlamps, Tail Lamps, and Retroreflective Garments in Nighttime Roadway Environments 

      Bhagavathula, Rajaram; Gibbons, Ronald B.; Williams, Brian M.; Connell, Caroline A. (National Surface Transportation Safety Center for Excellence, 2020-07-21)
      Cyclist deaths are overrepresented among traffic fatalities, and increasing cyclist conspicuity to drivers could potentially reduce cyclist deaths, particularly at night. This report describes an experiment with various ...
    • Camera-based Feature Identification for EasyMile Operation 

      Sarkar, Abhijit; Sundharam, Vaibhav; Manke, Aditi; Grove, Kevin (National Surface Transportation Safety Center for Excellence, 2022-11-15)
      The EasyMile deployment studied in this work included cameras that captured the 360 degrees of roadway environment around the vehicle. We developed a scene perception algorithm using computer vision technology to track ...
    • A Case Study Approach to Understand Heavy Truck Safety-critical Events in Work Zones 

      Dunn, Naomi; Soccolich, Susan; Hickman, Jeffrey S. (National Surface Transportation Safety Center for Excellence, 2022-08)
      Large trucks are overrepresented in work zone crashes. Data from the Federal Motor Carrier Safety Administration’s Large Truck and Bus Crash Facts show that, in 2017, 30% of work zone fatal crashes and 12% of work zone ...
    • Case Study on the Impact of Treating Sleep Apnea in Commercial Motor Vehicle Drivers: Sleep Apnea Programs from Two Leading U.S. Carriers and Focus Group Findings 

      Mabry, J. Erin; Baker, Stephanie Ann; Hickman, Jeffrey S.; Hanowski, Richard J. (National Surface Transportation Safety Center for Excellence, 2012-09-28)
      Approximately one in four commercial motor vehicle (CMV) drivers in the U.S. are estimated to possess mild or higher levels of obstructive sleep apnea (OSA), the most common sleep-breathing disorder that is associated with ...
    • Case Study on Worksite Health and Wellness Program for Commercial Motor Vehicle Drivers 

      Mabry, J. Erin; Hickman, Jeffrey S.; Hanowski, Richard J. (National Surface Transportation Safety Center for Excellence, 2013-10)
      Due to the elevated prevalence of overweight and obesity in the transportation industry and the risks that accompany obesity, a health and wellness (H&W) program at a leading trucking organization was initiated to reduce ...