Uncovering the Spillover Effect from Posted Speed Limit Changes: A Tool to Examine Potential Safety Concerns
This research employed a systematic exploration of the literature and spatial analysis to uncover speed-related crashes on roadways adjacent to Interstate highways with newly increased posted speed limits.
April 2024 Technical Report | Report Summary
Roadside Assistance Providers Fatally Struck by Vehicles at the Roadside: Incidence and Characteristics
Roadside assistance providers risk their own safety to help stranded motorists. This report examines crashes in which roadside assistance providers were struck and killed by vehicles, to inform efforts to protect them.
January 2024 Technical Report | Report Summary
A Safe System Guide for Transportation: Sharing this Approach to Lead Your Community to Action
This document presents recommendations for framing Safe System interventions to facilitate public acceptance and support.
November 2023 Technical Report | Report Summary
A Multi-Site Examination for the Impact of Changes in Posted Speed Limit on Traffic Safety
This study examined the effects of posted speed limit changes on traffic safety by conducting before-and-after assessments using crash and speed data from multiple sites.
July 2023 Research Brief
Protecting Roadside Workers: Field Evaluation of Flares, Cones, and Tow Truck Light Patterns
This report documents a study with three aims: evaluate the effectiveness of flares or cones in combination with two different tow truck lighting systems; survey workers regarding use of flares and cones; and document available and potential countermeasures.
January 2023 Technical Report | Report Summary
Protecting Roadside Workers: Field Evaluation of a Vehicle-Mounted Variable Message Sign and Examination of Worker Perceptions and Use of Countermeasures
This project assesses the effectiveness of a vehicle-mounted variable message sign in promoting safer behaviors in passing motorists. The study also examined workers’ perceptions and adoption or use of different countermeasures.
January 2023 Technical Report | Report Summary
Traffic Fatalities on Urban Roads and Streets in Relation to Speed Limits and Speeding, United States, 2010–2019
This research brief examines characteristics of traffic fatalities on urban roads and streets in relation to various factors, with an emphasis on the speed limits present at crash locations, as well as the role of speeding.
July 2022 Research Brief
Improving Roadside Responder Crash Data: Outcomes from an Expert Roundtable Discussion
This brief highlights a roundtable discussion that sought to identify ways to improve data about the safety of incident response and emergency services personnel working on the side of the road. Recommendations are made based on information provided by the panel of experts.
December 2021 Research Brief
Impact of Speeds on Drivers and Vehicles – Results from Crash Tests
This study examines how vehicle crashworthiness and occupant protection degrade as impact speeds increase. The results and implications in this report provide valuable information for those who advocate for safety considerations when setting maximum posted speed limits.
January 2021 Technical Report | Report Summary
Review of Current Practices for Setting Posted Speed Limits
The aim of this study is to investigate the current practice of how speed limits are set across the country and to understand how the process impacts the traffic environment and drivers’ behaviors.
April 2019 Research Brief