Asphalt concrete is a complex material that consists of aggregates, asphalt, and air voids. Aggregates are held together by asphalt and form a skeleton to support the weight of vehicles. The stiffer the asphalt, the tighter the aggregates are held together and the heavier the load a pavement is able to handle. Certain aggregate structures have stro
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This report presents a synthesis of research findings on the safety effects of speed, speed limits, enforcement, and engineering measures to manage speed. The report is the update of research on speed and speed control that was originally published in 1963 and updated in 1970 by the Highway Users Federation for Safety and Mobility as a chapter in "
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The number of motor vehicles available to a household has a major impact on the travel behavior of the members of the household. As a result, many metropolitan planning organizations have incorporated models of household vehicle availability or automobile; Prepared in cooperation with Federal Transit Administration, Washington, DC. and Environmenta
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This research explored the feasibility of modeling crash counts at intersections with use of available exposure measures. The basic purpose of "exposure" is to serve as a size factor to allow comparison of crash counts among populations of different sizes. In the context of highway crash studies, at first glance, vehicle miles of travel (VMT) appea
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The HPC (High Performance Concrete) definition presented here identifies a set of concrete performance characteristics sufficient to estimate long-term concrete durability and strength for highway structures. Standard laboratory tests, specimen preparation;Also pub. as ACI High Performance Concrete Committee, Farmington Hills, MI. report. no. SR-4.
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The purpose of this manual is to provide instruction on the use of the computer program DRIVEN. This manual details the installation procedure, provides narration for each user input and output screen, discusses the engineering background used in the analytical development of the program, presents example problems, and finally provides a detailed d
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The purpose of the Commercial Vehicle Information Systems and Networks Model Deployment Initiative (CVISN MDI) is to demonstrate the technical and institutional feasibility, costs, and benefits of the primary Intelligent Transportation Systems (ITS) user services for commercial vehicle operations (CVO) and to encourage further deployment of these s
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This document assembles best practices and presents practical advice on how to acquire the software components of Intelligent Transportation Systems (ITS). The intended audience is the “customers”--project leaders, technical contract managers, decision makers, and consultants--who are responsible for one or more ITS systems. The document presents a
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The purpose of the Commercial Vehicle Information Systems and Networks Model Deployment Initiative (CVISN MDI) is to demonstrate the technical and institutional feasibility, costs, and benefits of the primary Intelligent Transportation Systems (ITS) user services for commercial vehicle operations (CVO) and to encourage further deployment of these s
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In April 1996, a proposal for the NY/NJ/CT metropolitan area was submitted by the Transportation Operations Coordinating Committee (TRANSCOM), in partnership with the New York State Department of Transportation (NYSDOT) and Lockheed Martin Federal Systems (LMFS), in response U.S. DOT’s ITS Model Deployment Initiative (MDI). After the proposal was s
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This document assembles best practices and presents practical advice on how to acquire the software components of Intelligent Transportation Systems (ITS). The intended audience is the “customers”--project leaders, technical contract managers, decision makers, and consultants--who are responsible for one or more ITS systems. The document presents a
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This document has been produced to provide senior transportation managers of state and local departments of transportation with practical guidance for deploying Intelligent Transportation Systems (ITS) consistent with the National ITS Architecture. The purpose of this document is to show specific ways in which the National ITS Architecture can be u
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The Rural Public Transportation Technologies: User Needs and Applications study was conducted as part of the U.S. Department of Transportation’s (DOT) overall Rural Intelligent Transportation System (ITS) Program. The study examined the opportunities and challenges of planning and deploying advanced public transportation systems (APTS) technologies
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This evaluation addresses technical challenges of developing advanced traveler information systems (ATIS) in rural environments, institutional benefits and issues, usefulness of the information to the traveling public, effectiveness of various media in disseminating information to the public, and the overall impact of the information on traveler be
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The Rural Public Transportation Technologies: User Needs and Applications study was conducted as part of the U.S. Department of Transportation's (DOT) overall Rural Intelligent Transportation System (ITS) Program. The study examined the opportunities and challenges of planning and deploying advanced public transportation systems (APTS) technologies
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This document presents best practices and practical advice on how to acquire the software components of Intelligent Transportation Systems (ITS). The executive summary briefly describes the themes and activities developed during the project development.
Long-Term Pavement Performance (LTPP) data are the foundation for new pavement designs for years to come. As such, data collected at LTPP test sites need to be as accurate and complete as possible. For the collection of truck weight data, this requires direct calibration of weigh-in-motion (WIM) scales at LTPP test sites. The purpose of this TechBr
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The accuracy and reliability of traffic load estimates are key to determining a pavement's life expectancy. To better understand the variability of traffic loading rates and its effect on the accuracy of the Long Term Pavement Performance (LTPP) program's loading estimates, LTPP recently completed an analysis studying the effect of varying truck lo
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United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
1998-07-01
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There is a need for a generalized water and sediment-routing computer model for solving complicated river engineering problems with limited data and resources. This program should have the following capabilities: to compute hydraulic parameters for open channels with fixed as well as alluvial boundaries; to compute water surface profiles for subcri
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