This study set out to examine the following diverse questions regarding cooperative adaptive cruise control (CACC) use: - Does CACC reduce driver workload relative to manual gap control? - Does CACC increase the probability of driver distraction relative to manual gap control? - Does CACC result in reduced driver arousal relative to manual gap cont
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This study is the second in a series of four experiments exploring human factors issues associated with the introduction of cooperative adaptive cruise control (CACC). Specifically, this study explored drivers’ abilities to merge into a stream of continuously moving vehicles in a dedicated lane. Participants were asked to complete one of three diff
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The wide use of grouts and grout-like materials in the construction industry is seen in applications such as joint sealing, structural repair, and connections in prefabricated bridge elements (PBEs). Currently, different types of grouts are available (e.g., epoxy-based, cementitious-based, etc.). The selection of the most appropriate grout type is
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The production use of precast concrete pavement (PCP) has come a long way over the last 15 years. The technology is gaining wider acceptance in the U.S. for rapid repair and rehabilitation of concrete pavements as well as for heavily trafficked asphalt concrete pavements and intersections. Several U.S. highway agencies have implemented the PCP tech
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The production use of precast concrete pavement (PCP) has come a long way over the last 15 years. The technology is gaining wider acceptance in the U.S. for rapid repair and rehabilitation of concrete pavements as well as for heavily trafficked asphalt concrete pavements and intersections. Several U.S. highway agencies, including Caltrans, Illinois
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United States. Federal Highway Administration. Office of Asset Management, Pavements and Construction
2016-12-01
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Congress established the Accelerated Implementation and Deployment of Pavement Technologies (AID-PT) program in 2012 under the Moving Ahead for Progress in the 21st Century Act (MAP-21). In 2015, Congress continued the program in the Fixing America’s Surface Transportation (FAST) Act, with funding available through fiscal year 2020. The program’s p
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This Manual explains the relevant issues related to fatigue and fracture in steel bridges, including analysis, design, evaluation, repair, and retrofit. Chapter 1 provides an introduction to fatigue and fracture, as well as an introduction to the Reference Manual. Chapter 2 begins with a discussion of cracking in steel structures, including crack b
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This report focuses on a review of issues related to nighttime visibility and assessment of how the Federal Highway Administration (FHWA) Office of Safety’s three safety program areas—roadway departure safety, intersection safety, and pedestrian and bicycle safety—address concerns for nighttime visibility, as well as a review of fatality data and a
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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FHWA published the Systemic Safety Project Selection Tool (Systemic Tool) in 2013 and, given the condition of the practice at that time, most discussion and examples were based on rural applications and were located along a system with strong supporting data for crashes and road system characteristics. Since publication of the original Systemic Saf
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2016-12-01
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This summary report focuses on some of the key findings that resulted from the investigation of the deck of the bridge selected for participation in the Long-Term Bridge Performance (LTBP) Program pilot study located in New Jersey (“New Jersey pilot bridge”). Constructed and opened to traffic in 1969, the bridge has a multigirder steel superstructu
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This document provides guidance on Ground Modification Methods, and also serves as the reference manual for FHWA NHI courses No. 132034, 132034A, and 132034B on Ground Modification Methods. The purpose of this manual is to introduce available ground modification methods and applications to design generalists, design specialists, construction engine
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This document provides guidance on Ground Modification Methods, and also serves as the reference manual for FHWA NHI courses No. 132034, 132034A, and 132034B on Ground Modification Methods. The purpose of this manual is to introduce available ground modification methods and applications to design generalists, design specialists, construction engine
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In order to transform a traffic incident management (TIM) program or project from a stand-alone effort to a sustainable core function of an agency, the establishment of a solid business case is necessary. The purpose of this document is to support TIM agencies and partner agencies in the development of a strong business case for their TIM programs,
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The purpose of this primer is to assist transportation planners in effectively using archived operations data for developing, analyzing, and evaluating transportation plans and programs. This primer raises planners' awareness of the opportunities afforded through archived operations data and provides guidance on how to take advantage of that data t
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Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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The Federal Highway Administration’s (FHWA) Safety Compass newsletter aims to increase highway safety awareness and to provide resources to the highway safety community to help save lives. The newsletter is published three times a year, and includes articles on safety-focused offerings from FHWA, other DOT modes; our State, Local, and Tribal partne
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This report summarizes the independent assessment of the effectiveness and lessons learned from roadside motor carrier compliance systems including assessment of the Smart Roadside Initiative (SRI) Prototype and other SRI-like technologies. The locations selected for the assessment were Grass Lake, Michigan; West Friendship, Maryland; Lyon and Simp
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The bump at the end of the bridge has long been studied for highways and railways, yet experts from across the transportation industry continue to identify it as one of the most prevalent substructure factors affecting bridge performance. Often, rideability is a subjective measurement used by transportation departments to define the presence of a b
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