Now showing items 3-22 of 97

    • Active and Adaptive Roadway Delineation Systems 

      Williams, Brian; 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. L.; Camden, M. C.; Hickman, J. 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 ...
    • 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; Hickman, Jeffrey; 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; 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, ...
    • An Assessment of Quiet Vehicles and Pedestrian and Bicyclist Safety 

      Alden, Andrew S. (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; Gibbons, Ronald B. (Virginia Tech. Virginia Tech Transportation Institute, 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; Connell, Caroline (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 ...
    • 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. (Virginia Tech. Virginia Tech Transportation Institute, 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. (Virginia Tech. Virginia Tech Transportation Institute, 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 ...
    • CMV Driver Health Outreach 

      Trimble, Tammy E.; Morgan, Justin F.; Hanowski, Richard J.; Blanco, Myra (Virginia Tech. Virginia Tech Transportation Institute, 2013-10)
      Many commercial motor vehicle (CMV) drivers struggle to maintain a healthy lifestyle against the demands of their job. While some previous CMV health programs have been developed, these programs have either not been widely ...
    • Color Camera 

      Meyer, Jason E.; Gibbons, Ronald B.; Connell, Caroline A. (National Surface Transportation Safety Center for Excellence (NSTSCE), 2017-02-28)
      Under the sponsorship of the National Surface Transportation Safety Center for Excellence (NSTSCE), a research team at the Virginia Tech Transportation Institute (VTTI) developed a color camera system that can collect ...
    • Commercial Motor Vehicle Crash Risk by Time of Day 

      Camden, Matthew C.; Soccolich, Susan A.; Hickman, Jeffrey S.; Rossi-Alvarez, Alexandria; Hanowski, Richard J. (National Surface Transportation Safety Center for Excellence, 2020-11-16)
      Despite a plethora of research examining commercial motor vehicle (CMV) crash risk as a function of time of day, there are few studies that have included objective measures of exposure. The purpose of this study was to use ...
    • Commercial Motor Vehicle Driver Risk Based on Age and Driving Experience 

      Dunn, Naomi; Soccolich, Susan; Hickman, Jeffrey (National Surface Transportation Safety Center for Excellence, 2020-04-17)
      The commercial motor vehicle (CMV) industry comprises a largely aging workforce, which adds to a widely held concern about a growing CMV driver shortage. As CMV drivers age and retire, there are fewer workers to step in ...
    • Commercial Motor Vehicle Driving Safety Website 

      Tidwell, Scott; Trimble, Tammy; Blanco, Myra (National Surface Transportation Safety Center for Excellence, 2016-08-06)
      This report documents the CMV Driving Safety website (http://cmvdrivingsafety.org/), which was created by the National Surface Transportation Safety Center for Excellence (NSTSCE) as an outreach effort to assist commercial ...
    • Commercial motor vehicle health and fatigue study: final report 

      Wiegand, Douglas M.; Hanowski, Richard J.; McDonald, Shelby E. (Virginia Tech. Virginia Tech Transportation Institute, 2009-02-11)
      Fatigue is a major risk factor in commercial motor vehicle operations, identified in naturalistic driving studies as a contributing factor in approximately 20 percent of safety-critical incidents. Understanding the nature ...
    • Commercial Motor Vehicle Operator Fatigue Detection Technology Catalog and Review 

      Mabry, J. Erin; Glenn, T. Laurel; Hickman, Jeffrey Scott (National Surface Transportation Safety Center for Excellence, 2019-02-21)
      According to the National Academies of Science, Engineering, and Medicine, fatigue plays a role in up to 20% of fatal commercial motor vehicle (CMV) crashes. Because fatigue is difficult to self-assess, the use of fatigue ...
    • Common Data Elements between the Large Truck Crash Causation Study Investigations and Commercially Available Onboard Monitoring Systems 

      Marburg, T. Laurel; Hickman, Jeffrey S.; Hanowski, Richard J. (2015-01-28)
      At the heart of traffic safety is the identification of factors that lead to crashes. With this knowledge, interventions can be developed to mitigate or prevent these factors from occurring in the future. Post hoc ...
    • Comparing Three Methods of Eye-Glance Transition Coding 

      McClafferty, Julie A.; Hankey, Jonathan M. (National Surface Transportation Safety Center for Excellence, 2016-09-30)
      In order for researchers to analyze driver glance behavior and compare their results to other studies, glance evaluation methodologies must be comparable in terms of how specific terms are defined. To this end, the ...