John Hennessy III,
P.E.
NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM
Cable barriers are longitudinal roadside devices used to contain and/or redirect errant vehicles that depart the roadways. These barriers gradually redirect or arrest an impacting vehicle by stretching of the cables, minimizing forces on the vehicle and its occupants. While cable barriers have been used on U.S. highways for more than 60 years, their use has been on the rise and is expected to increase in the future.
TRANSPORTATION RESEARCH BOARD
TCRP Project H-41 addresses the need for new measures of the environmental benefits of transit investments. The objective of this research is to present, evaluate, and demonstrate criteria, metrics, and methods for assessing and comparing the environmental performance of major transit investments. For purposes of this research, the following definitions are used:
TRANSPORTATION RESEARCH BOARD
This report presents guidelines for providing access to rapid transit stations, describes a station access planning process, and provides a high-level station access planning tool. The guidelines, process, and planning tool are based on a detailed review of available literature and transit agency practices, as well as case studies conducted during the course of the research.
TRANSPORTATION RESEARCH BOARD
Presidential Executive Order 12898, “Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations,” directs federal agencies to identify and address the disproportionately high and adverse human health or environmental effects of their programs, policies, and activities on minority and low-income populations.
FEDERAL HIGHWAY ADMINISTRATION
The main goal of this project was to use Long-Term Pavement Performance (LTPP) Specific Pavement Study (SPS) experiment data to assess the impact of different design, construction, and rehabilitation features on pavement response and performance for specific site conditions. The analysis sought to identify which features could help achieve the best short-term and long-term performance and to evaluate the effectiveness of common maintenance practices used for flexible and rigid pavements.
TRANSPORTATION RESEARCH BOARD
The U.S. transportation system serves hundreds of millions of travelers and handles millions of tons of freight each day to help ensure the efficient movement of people and goods in support of personal goals and domestic and international commerce. A well-functioning transportation system is essential for business travel and tourism, yet no national data have been collected on long-distance, intercity passenger travel by surface transportation modes since 1995.
TRANSPORTATION RESEARCH BOARD
Transportation planners and traffic engineers are faced nowadays with immense modeling challenges arising from several emerging policy, planning, and engineering developments. Hence, interest has grown in applying traffic analysis tools capable of analyzing travel activities and dynamic network performance for a corridor or region over peak hours or even extended daily hours.
TRANSPORTATION RESEARCH BOARD
How does the transportation community develop solutions and approaches that will minimize or eliminate the impact of climate change? To many, this question is a paramount one as the nation builds, rebuilds, operates, and maintains its transportation infrastructure.
TRANSPORTATION RESEARCH BOARD
Durability is a problem for today’s bridges. Bridge components break down. Soils become unstable. Bridge decks deteriorate, often unnoticed. Replacing bridges can be costly, time-consuming, and disruptive to traffic. And the cycle repeats as bridges age. Innovative methods have been developed for designing and constructing new bridges, repairing existing bridges, stabilizing bridge foundations, and nondestructively testing bridges; but they are not routinely used. Today’s innovations, however, can become tomorrow’s standards.
TRANSPORTATION RESEARCH BOARD
North America’s rural landscape is dotted with isolated settlements, villages, and small towns that are typically located on rural roads where the general speed limit is 55 to 60 mph (90 to 100 km/h). Motorists are expected to slow down as they pass through these settlement areas, reducing their operating speed to 30 or 40 mph (50 or 65 km/h) in sections of road known as transition zones…There is clearly a need for better and more information concerning rural high-to-low speed transitions. This synthesis report is a preliminary step in that direction.
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