United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2010-12-01
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The FHWA Office of Planning and the Federal Transit Authority’s (FTA) Office of Planning and Environment regularly publishes the Transportation Planning Update Newsletter which highlights important transportation planning activities occurring within both agencies and with our stakeholders and partners. The newsletter assists FHWA and FTA planning s
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2010-12-01
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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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This report documents the second part of the FHWA research study involving analysis of the microscopic impacts of adverse weather on traffic flow, but is a third phase of the research effort on the impacts of weather on traffic flow. The first phase of FHWA research involved macroscopic analysis, which focused on the impacts of adverse weather on a
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Compaction is the process of reducing the volume of hot-mix asphalt (HMA) by the application of external forces. As a result of compaction, the volume of air voids decreases, aggregate interlock increases, and interparticle friction increases. The quality of field compaction of HMA is one of the most important elements influencing asphalt pavement
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Through the U.S. Department of Transportation’s (USDOT) SafeTrip-21 initiative, the USDOT is testing a variety of technologies in a number of locations in California as well as along the I-95 corridor on the east coast. This document presents the evaluation findings, resulting primarily from in-person interviews the Evaluation Team conducted with i
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Through the U.S. Department of Transportation’s (USDOT) SafeTrip-21 initiative, the USDOT is testing a variety of technologies in a number of locations in California as well as along the I-95 corridor on the east coast. This document presents the evaluation findings, resulting primarily from in-person interviews the Evaluation Team conducted with i
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The project objective was to perform research and develop usable tools that can assist transportation and air quality modelers in preparing project-level emission analyses that take advantage of the capabilities of the MOVES model. In this project, the consulting team developed several sets of MOVES files detailing operating mode profiles (which ar
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This report provides an overview of freight transportation, focusing on the volume and value of freight shipments, the extent of the freight network, industry employment and productivity patterns, and related safety, energy use, and environmental effects. Economic and social characteristics of the United States also are provided as background infor
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The use of modular bridge deck components has the potential to produce higher quality, more durable bridge decks; however, the required connections have often proved lacking, resulting in less than desirable overall system performance. Advanced cementitious composite materials whose mechanical and durability properties far exceed those of conventio
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The Volpe Center Acoustics Facility, in support of the Federal Highway Administration,investigated the influence of temperature on tire/pavement noise in order to provide guidance on correcting for temperature variations in measured sound levels. Several traffic noise and vehicle pass-by data sets with broad variation in both pavement and air tempe
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The objective of this study was to investigate the relative daytime and nighttime visibility of three crosswalk marking patterns: transverse lines, continental, and bar pairs. In general, this study collected information on the distance from the crosswalk at which the participant verbally indicated its presence. The 78 participants were about evenl
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2010-11-01
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On a monthly basis, each State is required to report to the Federal Highway Administration (FHWA), the amount of gallons taxed by that state. This data is analyzed and compiled by FHWA staff. The data on the amount of on-highway fuel use for each State is then used to attribute federal revenue to each State. Yearly, the FHWA, Office of Policy, prov
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2010-11-01
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This TechBrief describes probabilistic optimization for profit (Prob.O.Prof 2.0), a Microsoft Excel® spreadsheet-based software program developed to assist both pavement construction contractors and highway agencies. Contractors using Prob.O.Prof 2.0 can set target construction quality levels to optimize project quality, and highway agencies using
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United States. Federal Highway Administration. Office of Research, Development, and Technology
2010-11-01
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This TechBrief highlights the results of a research program that developed finite element analysis modeling techniques applicable to ultra-high performance concrete (UHPC) structural components.
The U.S. Department of Transportation IntelliDrive initiative seeks to improve transportation safety and mobility while reducing the environmental impact of surface transportation through the use of networked wireless communication among vehicles, roadway infrastructure, and travelers' personal communication devices.This report summarizes the findi
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2010-11-01
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This document is a technical summary of the unpublished Federal Highway Administration (FHWA) report Behavior of Field-Cast Ultra-High Performance Concrete Bridge Deck Connections Under Cyclic and Static Structural Loading, which is available through the National Technical Information Service (NTIS), www.ntis.gov. The TechBrief highlights the resul
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United States. Federal Highway Administration. Office of Research, Development, and Technology
2010-11-01
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This document is a technical summary of the Federal Highway Administration (FHWA) report, LTPP Computed Parameter: Dynamic Modulus, FHWA-HRT-10-035. The primary objective of this project was to develop estimates of the dynamic modulus, |E*|, of hot-mix asphalt (HMA) layers on Long-Term Pavement Performance (LTPP) program test sections following the
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United States. Federal Highway Administration. Office of Research, Development, and Technology
2010-11-01
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Developed as part of pooled fund study TPF-5(013), the Long-Term Pavement Performance (LTPP) Performance Forecast produces freeze/thaw performance predictions for both rigid and flexible pavements. These predictions are based on regression models using data available from approximately 800 in-service test sections in the LTPP database. These sectio
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