John Hennessy III,
P.E.
NATIONAL COOPERATIVE FREIGHT RESEARCH PROGRAM Current State of Knowledge of Urban Freight Flows and Their Impacts Introduction This section summarizes data on truck and van traffic and its impacts on metropolitan areas. First, a brief review of land use trends relevant to freight supply and demand in metropolitan areas provides some context. Second, the limited […]
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TRANSPORTATION RESEARCH BOARD: NCHRP IDEA Program Introduction This annual report presents a summary of progress on investigations conducted as part of the Innovations Deserving Exploratory Analysis (IDEA) program for the National Cooperative Highway Research Program (NCHRP). The NCHRP-IDEA program is jointly funded by the state highway agencies through membership in the American Association of State […]
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TRANSPORTATION RESEARCH BOARD
Report Dated June 2011
Regardless of what climate change mitigation strategies are adopted, the shorter-term effects of climate change mean that transportation policy makers, planners, and operators—across all modes—need to make changes to adapt to these effects. This E-Circular on adaptation, developed under the auspices of the TRB Special Task Force on Climate Change and Energy, is a companion to the TR News Special Edition issue of May–June 2010 on climate change mitigation.
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.
NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Chapter 1: Background Optimal performance of a bridge under normal service loads is essential for full and effective use by the motoring public. Problems that occur as a result of excessive deflections, deteriorating deck conditions, or fatigue cracking of steel girders or beams under normal operating service loads can cause […]
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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
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.
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