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Development of the AASHTO Highway Safety Manual began from a TRB conference session and a workshop, both held in 1999, that identified the need for a traffic safety document analogous to the role of the Highway Capacity Manual for traffic operations. NCHRP Research Report 1140: Quantitative Safety Analyses for Highway Applications, from TRB’s National Cooperative Highway Research Program, describes […]
In recent years there has been a significant increase of the interest in additive manufacturing (AM; also frequently referred to as 3D printing), yet AM is largely unexplored within infrastructure projects. By harnessing the new capabilities of AM, researchers have managed to access unprecedented new design capabilities and operational flexibility (e.g., on-demand, tool-free production). This […]
Federal aid to disaster-damaged highways and bridges has been available since the 1930s. The U.S. Department of Transportation provides federal assistance for disaster-damaged federal-aid highways through the Emergency Relief (ER) Program administered by the Federal Highway Administration (FHWA). The program is funded by a permanent annual authorization of $100 million from the Highway Trust Fund […]
Strength loss in high plasticity clay soils is a common occurrence along roadways in western and central Alabama and has considerable impact on pavement distress and slope failures. Approximately $16 million was spent to repair slope failures in western and central Alabama between 2005 and 2015 with many of these failures occurring in areas with […]
In recent years, some localities have removed highways or built structures known as “highway caps” over sections of highways to repurpose the land for community or economic development. GAO identified 21 projects to remove or cap highways that received federal funding from fiscal years 2012 through 2021, the most current data available at the time […]