An official website of the United States government.
Here's how you know
The .gov means it's official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser's address (or "location") bar.
This site is also protected by an SSL (Secure Sockets Layer) certificate that's been signed by the U.S. government. The https:// means all transmitted data is encrypted — in other words, any information or browsing history that you provide is transmitted securely.
More than 2,100 people were struck and killed while stranded or working on the roadside in 2019–2023. Included among them were drivers and passengers who exited disabled vehicles, as well as roadside assistance providers, law enforcement officers, firefighters, emergency medical services providers, and “Good Samaritans” attempting to help them. Slow Down, Move Over (SDMO) laws […]
Crash reports are the primary source of data for identifying crash types, involved persons and vehicles, contributing factors, and crash patterns and trends. Researchers and policy makers depend on crash report data to identify problems, select and evaluate countermeasures, and analyze the effectiveness of safety measures and policies designed to reduce motor vehicle crash frequency […]
Understanding how to effectively influence electric vehicle (EV) charging behavior is critical for managing electricity grids powered by high levels of variable renewable generation. We present results from a large-scale natural field experiment conducted in the United Kingdom, involving approximately 110,000 EV customers and 60% of the country’s public charging infrastructure. Within this network, we […]
State transportation agencies have many tools available with which to maintain pavements proactively. These include tools such as pavement management systems to track roadway conditions and life cycle cost analysis tools. NCHRP Synthesis 623: Wintertime Pavement Maintenance Practices, from TRB’s National Cooperative Highway Research Program, documents the current state DOT practices for the reactive pavement […]
Advanced vehicle technologies have the potential to improve safety and convenience for drivers; however, to realize these benefits, it is important that drivers use the systems appropriately. Past research has documented gaps in drivers’ understanding of how new technology works and when it should be used. It follows that the interplay between a driver’s knowledge, […]
WASHINGTON, D.C. – Barbara Rooney, Governor’s Representative (GR) and Director of the California Office of Traffic Safety (CA OTS), was elected to serve as Chair of the Governors Highway Safety Association (GHSA) Executive Board at the organization’s 2022 Annual Meeting last week in Louisville, Ky. Rooney will serve a one-year term for GHSA, the national nonprofit […]
At zero cost, covid-free, and practically zero carbon, BTR #4 brings transportation engineers, planners, & policymakers together globally by removing the burden of travel, the cost of registration, & greenhouse gases associated with transport & accommodation. We welcome researchers and practitioners from diverse disciplines, & are delighted to include those unable to obtain visas or […]
Drivers are considered to be alcohol-impaired when their blood alcohol concentrations (BACs) are .08 grams per deciliter (g/dL) or higher. Thus, any fatal crash involving a driver with a BAC of .08 g/dL or higher is considered to be an alcohol-impaired-driving crash, and fatalities occurring in those crashes are considered to be alcohol-impaired-driving fatalities. The […]
This article dissects the issues impacting federal guidelines for investment in charging stations, including where electric vehicle chargers should be placed to meet the needs of all communities, not just affluent drivers traveling on the busiest roadways. StreetLight’s EV infrastructure planning metrics address those issues, spanning the identification of gaps in the current EV charging station network, predictive tools […]
Impaired driving continues to be a significant source of injury, death, and financial burden on society. Alcohol-impaired driving alone accounts for one-third of traffic deaths. Unlike alcohol, however, the prevalence of non-alcohol drugs among drivers remains relatively unknown. With the legalization of marijuana, emergence of the opioid epidemic, and results from National Roadside Surveys, it […]
