This report presents study findings related to corrosion resistance of 12 types of metallic reinforcing steel bars. The accelerated laboratory corrosion testing was performed using eight large-scale concrete slabs that simulated typical reinforced concrete bridge decks for about 18 mo by an accelerated corrosion testing protocol followed by a detai
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This report presents corrosion study findings related to corrosion resistance of eight types of metallic dowel bars. The accelerated laboratory corrosion testing was performed using seven small-scale concrete slabs that simulated typical concrete pavements for 452 d of a modified Southern Exposure followed by a detailed autopsy of the extracted bar
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This report presents the user guide for the Long-Term Pavement Performance (LTPP) Climate Tool. The climate data in the LTPP Climate Tool have been extracted from the National Aeronautics and Space Administration Modern-Era Retrospective Analysis for Research and Applications (MERRA) database. The LTPP Climate Tool was developed to provide convenie
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This design example, concrete pier cap strengthening, involves the addition of external post-tensioning bars to a concrete pier cap. The bridge is to be strengthened to carry HL-93 design live load. The existing bridge was designed for H-15 live load, and the previous widening was designed for HS-15 live load. This example is based on AASHTO LRFD B
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This research study devised two scenarios for application of multi-objective optimization to enhance calibration of performance models in the American Association of State Highway and Transportation Officials (AASHTO) AASHTOWare® Pavement ME Design software.(1) In the primary scenario, mean and standard deviation of prediction error are simultaneou
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2018-06-01
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This document is a technical summary of the Federal Highway Administration Long-Term Pavement Performance Program report Investigation of Increase in Roughness Due to Environmental Factors in Flexible Pavements Using Profile Data From Long-Term Pavement Performance Specific Pavement Studies 1 Experiment (FHWA-HRT-17-049).
Understanding how freight moves now and predicting how it might flow in the future are essential to transportation planning that meets the need for efficient, safe, and economical freight movement. The Federal Highway Administration (FHWA) Exploratory Advanced Research (EAR) Program is supporting freight transportation research that will develop to
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Every Day Counts (EDC) is a Federal Highway Administration program to advance a culture of innovation in the transportation community in partnership with public and private stakeholders. Through this State-based effort, FHWA coordinates rapid deployment of proven strategies and technologies to shorten the project delivery process, enhance roadway s
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2018-06-01
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Public Roads
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Public Roads is the quarterly magazine of the Federal Highway Administration (FHWA). Reading Public Roads is the easiest way to keep up-to-date on developments in federal highway policies, programs, and research and technology. More specifically, the magazine "covers" advances and innovations in highway/traffic research and technology, critical nat
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2018-06-01
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A Pedestrian Hybrid Beacon head consists of two red lenses above a single yellow lens. Unlike a traffic signal, the PHB rests in dark until a pedestrian activates it via push button or other form of detection. When activated, the beacon displays a sequence of flashing and solid lights that indicate the pedestrian walk interval and when it is safe f
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2018-06-01
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A pedestrian refuge island is a median with a refuge area that is intended to help protect pedestrians who are crossing a multilane road. This countermeasure is sometimes referred to as a crossing island, refuge island, or pedestrian island. The presence of a pedestrian refuge island at a midblock location or intersection allows pedestrians to focu
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2018-06-01
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RRFBs are pedestrian-actuated conspicuous enhancements used in combination with a pedestrian, school, or trail crossing warning sign to improve safety at uncontrolled, marked crosswalks. The device includes two rectangular-shaped yellow indications, each with an LED-array-based light source, that flash with high frequency when activated.
United States. Department of Transportation. Federal Highway Administration. Office of Safety
2018-06-01
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A typical Road Diet converts an existing four-lane, undivided roadway to two through lanes and a center, two-way left turn lane. This design allows left-turning drivers to exit the traffic stream while waiting for a gap to complete their turn and frees up space that can be reallocated to other uses.
United States. Department of Transportation. Federal Highway Administration. Office of Safety
2018-06-01
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Raised crosswalks are ramped speed tables spanning the entire width of the roadway, often placed at midblock crossing locations. The crosswalk is demarcated with paint and/or special paving materials. These crosswalks act as traffic-calming measures that allow the pedestrian to cross at grade with the sidewalk. In addition to their use on local and
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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2018-06-01
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Urban Congestion Report (UCR)
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The Urban Congestion Report (UCR) is produced on a quarterly basis and characterizes the most recent traffic congestion and reliability trends at the national and city level. Each quarterly UCR compares data from the most recent three months to the same three months in the previous year.
United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2018-05-31
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This digest shares the latest information from a range of Federal and non-Federal sources, addressing transportation and its relationship to the human environment. Through this information exchange, FHWA hopes to foster dialogue at all levels and continue to further the state of the practice on these important topics in support of safety; infrastru
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This Comprehensive Maintenance and Operations Plan (CMOP) describes the types and number of equipment to be operated and maintained for the proposed New York City (NYC) Connected Vehicle Pilot Deployment (CVPD) system. Its objective is to develop a plan for the operations and maintenance of in-vehicle, roadside, mobile device, center-related equipm
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This report summarizes the analysis methodology, results, and lessons learned from the deployment of the Enhanced Cross-Town Improvement Project (C-TIP) Drayage Optimization Proof of Concept Application. The system was deployed in the Los Angeles/Long Beach (California) area to five licensed motor carriers. The objective of the project was to provi
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We are pleased to provide updated guidance to help FHWA division offices implement key funds management principles. The attached guide summarizes current statutes, regulations, and policies for project funds management with a supplemental question and answer document. Also attached is a list of recommended documents that should be maintained by the
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