The primary objective of this research was to identify significant environmental (i.e., weather) variables that may contribute to snow and ice buildup on LED traffic signal lenses. If a subset of variables can be identified that may predict the potential occurrence of snow and/or ice buildup on L
Testing describes a series of processes and procedures developed in the information technology community to verify and validate system performance. While some of the terms used in testing may be unfamiliar to transportation professionals, the core concepts and processes are not technically comple
This tenth edition of Freight Facts and Figures was developed collaboratively by the Federal Highway Administration and the Bureau of Transportation Statistics. It provides a snapshot of the volume and value of freight flows in the United States, the physical network over which freight moves, the
This guidebook examines traffic incident management practices that are implemented by transportation management centers on managed lanes. The document examines the unique operating environment of managed lanes from an incident management perspective. The roles of the transportation management cen
Ramp metering is a strategy used to regulate the volume of vehicles entering a freeway at a given time thereby seeking optimal freeway operations. Access to the freeway is controlled using a traffic signal that is powered by an algorithm that uses real-time system traffic data to determine the ra
