A substantial fraction of automotive collisions occur at intersections. Statistics collected by the Federal Highway Administration (FHWA) show that more than 2.8 million intersection-related crashes occur in the United States each year, with such crashes constituting more than 44 percent of all reported crashes [12]. In addition, there is a desire to increase throughput at intersections by redu...

Impact echo (IE) is capable of locating subsurface defects in concrete slabs from the vibrational response slab to a mechanical impact. For an intact (“good” condition), frequency spectrum IE dominated by single peak corresponding slab’s “thickness resonance frequency,” whereas presence (“fair” or “poor” conditions) could manifest various ways such as multiple distinct peaks at frequencies high...

An experimental expert system was developed by the Texas Transportation Institute to assist users in selecting computerized software packages currently being supported by the FHWA. This system was designed to Investigate potential expert systems applications In transportation engineering. This study was performed to serve three basic purposes: to test the feasiblllty of developing a small-scale...

This projects develops the environment for using the ATMIS simulation software developed under previous PATH projects (MOUs 39, 84 and 170) for real-time traffk simulation and scenario analysis with feedback from the real urban network. DYNASMART simulation model was developed during the MOU-39 research, and was augmented with a graphical user-interface and display during the MOU-84 research. H...

control freeway traffic in the United States, particularly in California. It is recognized that ramp metering can directly control the flow into the freeway (demand) and the average density immediately downstream, which indirectly affects the traffic upstream. After drivers enter the freeway, their collective behaviors are not controlled, which determines the traffic flow pattern. In addition, ...

The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Indiana Department of Transportation of the Federal Highway Administration at the time of publication. The report does not constitute a standard, specification, or regulation. ...

The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data herein. The contents do not necessarily reflect the official views or policies of the Indiana Department of Transportation or the Federal Highway Administration at the time of publication. This report does not constitute a standard, specification or regulation. Adequate f...

The National Center for Asphalt Technology (NCAT) has undertaken a wide range of hot mix asphalt (HMA) related research projects. These projects have been funded by various agencies such as the National Cooperative Highway Research Program (NCHRP) of the Transportation Research Board, the Federal Highway Administration (FHWA), the Alabama Department of Transportation, the South Carolina Departm...

ITE JOURNAL / JUNE 2006 INTRODUCTION Throughout the United States, awareness of the critical linkages between transportation and land use is growing. State and regional transportation agencies are realizing that local jurisdictions’ land use decisions can help minimize infrastructure investment needs while improving safety, mobility and accessibility for their customers, the traveling public. L...