Checklist #14 in series created to guide local highway maintenance and inspection staff in the use of innovative pavement preventive maintenance processes. The series is provided through the joint efforts of the Pavement Preservation Program of the Federal Highway Administration (FHWA) and the Foundation for Pavement Preservation (FP2).
This TechBrief summarizes the results of a study on curling and warping in jointed concrete pavement (JCP). Profile measurements, following quality assurance plans developed under the study, were collected in all U.S. climate zones, diurnal periods, and seasons of the year to obtain sufficient data to fully characterize slab curvatures. Both functi
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This HSIP manual describes the overall Highway Safety Improvement Program and provides a roadway safety management process which focuses on results by emphasizing a data-driven, strategic approach to improving highway safety through infrastructure-related improvements. Current laws and regulations, new and emerging technologies, and noteworthy prac
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This publication is a reference manual designed to provide "how to" information to assist transportation professionals in taking actions to integrate these activities. It identifies and describes opportunities at various levels of decisionmaking - statewide, regional, corridor, and project - and the benefits of these approaches. It also highlights
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This document describes the components necessary for successful Strategic Highway Safety Plan (SHSP) implementation. It features discussions on the four fundamental elements (leadership, collaboration, communication, and data collection and analysis) and the four steps for successful implementation (emphasis area action plans; linkage to existing p
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This document supports the Strategic Highway Safety Plan Implementation Process Model (IPM). It features case studies derived from the experiences of States that were used as models during the development of the IPM. Each case study describes a noteworthy practice actually used by the State, the results achieved, and key accomplishments. Users can
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2010-01-01
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Mini-roundabouts are a type of roundabout characterized by a small diameter and traversable islands (central island and splitter islands). Mini-roundabouts offer most of the benefits of regular roundabouts with the added benefit of a smaller footprint. As with roundabouts, mini-roundabouts are a type of intersection rather than merely a traffic cal
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United States. Department of Transportation. Federal Highway Administration. Office of Asset Management
2010-01-01
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Determining an appropriate set of performance measures to use for managing the nation's highway network is a vital component of the work to preserve our existing transportation infrastructure. Recent research, such as National Cooperative Research Program (NCHRP) Project 20-74 describing an asset management framework for the Interstate Highway Syst
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Intelligent compaction (IC) is a construction method relatively new to the USA that uses modern vibratory rollers equipped IC components and technologies. Though used for decades in the rest of the world, the IC technology is less mature for its application in the asphalt compaction than its counter part for the soils and subbase compaction. Under
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The following case study showcases a successful and effective low-cost countermeasure that measurably improved safety at three signalized intersections in Michigan. The treatment included converting the permissive left-turn mode to permissive/protected phasing.
The FHWA believes that spread footings on soils are underutilized because designers encounter one or more of the following obstacles: (a) limited knowledge of AASHTO/FHWA technical references that pertain to spread footings on soils to support bridges; (b) limited knowledge of adequate performance data for spread footings; (c) unrealistic tolerable
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