For years, traffic engineers have used traffic simulation software to develop, model, and test signal timing plans. However, before timing plans can be implemented in the field, they must be fine-tuned in an actual traffic controller operating under actual intersection conditions. Testing a signal timing plan in the field can cause minor or even major traffic disruption, creating delay and frus...

For the past five years, the Georgia Tech Research Partnership has been developing a research-grade motor vehicle emissions model within a geographic information system (GIS) framework. The model has been developed under a cooperative agreement with the US Environmental Protection Agency (USEPA) and the Federal Highway Administration (FHWA), and has involved the direct funding and in-kind contr...

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Traffic Safety Administration, in the interest of information exchange. The opinions, findings, and conclusions expressed in this publication are those of the authors and not necessarily those of the Department of Transportation or the National Highway Traffic Safety Administration. The United States Government assumes no liability for its contents or use thereof. If trade names, manufacturers'...

Highlights of GAO-09-36, a report to congressional requesters As highway congestion continues to be a problem in many areas, states are looking to construct or expand highway projects. When a state department of transportation (DOT) receives federal funding for highway projects from the Federal Highway Administration (FHWA), the projects must comply with the National Environmental Policy Act (N...

usually staggered to separate the two crossings as shown in Figure 2. Staggered crossings are designed to force pedestrians to face the upcoming traffic and to avoid the confusion that pedestrians may see the further pedestrian signal indication when they are supposed to follow the first-stage signal. Staggered crossings are implemented widely in the United Kingdom and Japan and are recommended...

I n September 1975, the Federal Highway Administration (FHWA) and the Urban Mass Transportation Administration (UMTA) of the U.S. Department of Transportation issued joint regulations that required urban traffic planners and managers to make more efficient use of existing facilities for the purpose of expanding service and thereby avoiding increasing capital investment. 1 This federal program, ...

Full-scale and accelerated pavement testing (FS/APT) began as early as 1909 with a test track in Detroit, as identified by Metcalf in NCHRP Synthesis of Highway Practice 235: Application of Full-Scale Accelerated Pavement Testing (1). Various other facilities have been developed and used worldwide to pursue this activity, defined in NCHRP Synthesis 235 as " the controlled application of a proto...

An annual investment of $92 billion for highways and bridges, between 2004 and 2009, is necessary to maintain the physical condition and performance characteristics of the system. An annual investment of $125.6 billion for highways and bridges is necessary to improve the physical condition and performance characteristics of the system over 20 years. An annual capital investment of $19 billion i...

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