Selecting Ramp Design Speeds, Vol. 1: Guide

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 …

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 …

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…