Category: TRB

Driving trucks and buses is a physically demanding occupation that carries one of the highest injury rates of major occupational categories in the United States. Drivers often work in postures that increase risk of low back pain and other musculoskelet…

Water infiltration is a common problem in tunnels. Such infiltration accelerates the deterioration of the structure and elements within and creates hazards in the form of icicles and slippery roadways. The severity of water infiltration often reflects …

Designing extended sections of highway based on the road design speed is relatively straightforward. However, when applied to interchange ramps where high-speed facilities meet low-speed facilities and drivers are expected to accelerate or decelerate o…

Design speed is used to determine all pertinent highway features to obtain a balanced design. Over an extended length of highway, it is desirable to select a uniform design speed. The TRB National Cooperative Highway Research Program’s NCHRP Web-Only D…

In recent years, supplies of high-quality, freshly produced coal ash have declined due to increasing environmental controls and shutdowns of coal-fired powerplants in the United States and elsewhere. While supply has decreased, demand for coal ash for …

Per- and polyfluoroalkyl substances (PFAS) are a class of more than 6,000 contaminants of emerging concern that can harm both ecosystems and human health. These anthropogenic compounds contain carbon–fluorine bonds that make them stable and persistent …

Transportation networks are comprised of infrastructure, institutions, and individuals in diverse roles. When networks are disrupted, relationships between these roles can determine the cost, duration, and extent of impact for the entire system. Coordi…