This document is a technical summary of the Federal Highway Administration Long-Term Pavement Performance Program report, Analysis of the Study of Environmental Effects in the Absence of Heavy Loads (FHWA-HRT-16-084). The Long-Term Pavement Performance (LTPP) Program monitors the performance of pavements constructed using different materials that a
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This report summarizes the Federal Highway Administration (FHWA)’s one-year Bicycle-Pedestrian Count Technology Pilot Project. The purpose ofthe pilot project was to increase the organizational and technical capacity of Metropolitan Planning Organizations (MPOs) to establish and operateeffective bicycle and pedestrian count programs, and to provide
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Transportation plays a critical role in enhancing access to education, jobs, healthcare, recreation, leisure, and other activities. The United States Department of Transportation’s (USDOT’s) Accessible Transportation Technology Research Initiative (ATTRI) program leads the research, development, and implementation of transformative technologies, so
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This report is the third in a series of four human factors experiments to examine the effects of cooperative adaptive cruise control (CACC) on driver performance in a variety of situations. The experiment reported here was conducted in a driving simulator scenario in which the subject driver was embedded in a platoon of CACC-equipped vehicles. The
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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 user guide provides background information on safety performance functions (SPFs) and the need for calibration. It also serves as a companion “how-to” manual for The Calibrator software tool. Installation Note: The Calibrator was developed for Microsoft Excel versions 2007 and later, running on Windows Operating Systems with the SOLVER add-in
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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PDF
A Road Diet is generally described as removing or narrowing vehicle lanes from a roadway and reallocating the extra space for other uses or travel modes, such as parking, sidewalks, bicycle lanes, transit use, turn lanes, medians, or pedestrian refuge islands. Road Diets are a highly effective and relatively inexpensive safety countermeasure that h
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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PDF
A Road Diet repositions pavement markings to better meet the needs of all road users. A classic Road Diet converts a four-lane undivided roadway to a three-lane roadway, but there are many other reconfigurations being used by States and locals. For example, a Road Diet could convert the roadway space from five to three lanes, two to three lanes, or
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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PDF
Data can be a powerful tool for telling a story. Evaluating performance both before and after implementing a Road Diet is key to an agency successfully implementing its next Road Diet project. Data helps agencies choose the most appropriate projects to meet their needs, supports design decisions, helps garner public support, and provides a building
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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PDF
An ever-increasing number of transportation agencies are implementing Road Diets, which reallocate vehicle lanes for a number of uses, including accommodating pedestrians, bicyclists, and transit. Road Diets are also a means of traffic calming that can reduce speeding-related crashes and improve overall roadway safety. However, a common concern ass
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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2016-12-01
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PDF
A typical Road Diet converts two-way, four-lane roads to two travel-lanes with a center two-way left-turn lane (TWLTL). Although studies have shown that this conversion can reduce motor-vehicle crashes by 19 to 47 percent,1 emergency response personnel sometimes express concern that reducing the number of through lanes could increase emergency resp
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2016-12-01
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PDF
The Federal Highway Administration (FHWA) is responsible for assuring that adequate highway transportation data and systems performance information is available to support its functions and responsibilities, as well as those of the Administration and United States Congress. A biennial Conditions & Performance report of the future highway investment
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2016-12-01
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PDF
Traffic Volume Trends is a monthly report based on hourly traffic count data reported by the States. These data are collected at approximately 5,000 continuous traffic counting locations nationwide and are used to estimate the percent change in traffic for the current month compared with the same month in the previous year. Estimates are re-adjuste
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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2016-12-01
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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.
A basic part of travel demand model validation is running the model for a “base year” and comparing the outputs to observed data. Sensitivity testing and temporal validation are also critical components of any model validation effort. In this project, two model versions for each of two metropolitan areas were run twice each: 1) the more recent vers
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The Illinois Department of Transportation (IDOT) published the AASHTO Highway Safety Manual Illinois User Guide with Illinois Calibration Factor and Default Values in 2014. This book provides guidance on incorporating AASHTO Highway Safety Manual methods into Illinois roadway safety management practices. Also in 2014, IDOT published the Systemic Sa
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The South Carolina Department of Transportation (SCDOT) and the South Carolina Department of Public Safety (SCDPS) implemented the South Carolina Collision and Ticket Tracking System (SCCATTS), a long-term initiative to improve law enforcement data quality. SCCATTS supports decision making with quality data and efficient data sharing among stakehol
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United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2016-11-17
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PDF
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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The ETFOMM (Enhanced Transportation Flow Open Source Microscopic Model) Cloud Service (ECS) is a software product sponsored by the U.S. Department of Transportation in conjunction with the “Microscopic Traffic Simulation Models and Software—An Open Source Approach” project. ETFOMM’s primary components are the core microscopic traffic Simulation Eng
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