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There are two types of PT tendons—bonded or unbonded—depending on the timing of installing the duct, tensioning the strands, and filling the ductwith grout. Injected filler materials afford additional corrosion protection by providing physical barriers to water and air, i.e., oxygen and carbon dioxide.Cementitious grout can also be beneficial, providing a high-pH environment to form […]
In general, ridesourcing (also referred to as ridesharing) and taxi companies can be regulated by states, localities, or both. GAO’s review of state statutes and regulations found that 45 states and Washington, D.C., (states) require criminal background checks for prospective ridesourcing drivers, and 11 states require criminal background checks for prospective taxi drivers. Although fewer […]
In 2023 seat belt use in the United States ranged from 68.2 percent in the U.S. Virgin Islands to 98.4 percent in Hawaii. Twenty-seven States, the District of Columbia, Guam, Puerto Rico, and the Northern Mariana Islands achieved seat belt use rates of 90 percent or higher. These results are from probability-based observational surveys conducted […]
This report is a collaborative effort between the AAA Foundation for Traffic Safety, Johns Hopkins University, and the Institute of Transportation Engineers. This work’s objective is to produce a useful resource for communities that plan to deploy the Safe System approach in their transportation designs and services. This report presents information to equip stakeholders to […]
The term young driver refers to a person 15 to 20 years old operating a motor vehicle. People in this age group generally obtain their licenses for the first time and many are under graduated driver licensing (GDL) programs as they learn driving skills. In 2022 there were 2,034 young drivers who died in traffic […]
A past research effort initiated by the Federal Highway Administration (FHWA) found that the combined workload of guidance (i.e., selection ofthe vehicle path) and control (i.e., physical operation of the vehicle) in the vicinity of interchanges creates a particularly challenging environment formotorists (Katz et al. 2018). At interchange ramp locations, drivers use cues from the […]
A past research effort initiated by the Federal Highway Administration (FHWA) found that the combined workload of guidance (i.e., selection of the vehicle path) and control (i.e., physical operation of the vehicle) in the vicinity of interchanges creates a particularly challenging environment for motorists (Katz et al. 2018). At interchange ramp locations, drivers use cues […]
The National Highway Traffic Safety Administration considers a traffic crash to be speeding-related if any driver in the crash was charged with a speeding related offense or if a police officer indicated that racing, driving too fast for conditions, or exceeding the posted speed limit was a contributing factor in the crash. A speeding-related fatality […]
In 2022 there were 6,218 motorcyclists killed, 15 percent of all traffic fatalities. The number of motorcyclist fatalities in 2022 increased by 1 percent from 2021, from 6,143 to 6,218. Read the full fact guide here.
Advanced in-vehicle technology is becoming more commonplace in the U.S. passenger vehicle fleet. Under limited circumstances, driver support features such as adaptive cruise control (ACC), lane centering assist (LCA), and other forms of vehicle automation can now perform parts of the driving task. It follows that these features can change drivers’ roles, including adopting passive […]