Small rotorcraft unmanned aerial systems have become increasingly common before, during, and after flooding disasters. A commonly used platform that retails for approximately $1,000 can perform six of the seven basic missions for flood events. The low cost of current UAS combined with the best practices that have emerged since their first introduct
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The purpose of this reference guide is to provide guidelines for load rating the nation’s highway tunnels to meet the regulatory requirements and to ensure consistency and uniformity of load rating those tunnels. This reference guide provides technical aspects for the load rating of tunnel structures that meets FHWA’s general load rating guidance a
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FHWA R&T Now is a news update of research, technology, and development from the U.S. Department of Transportation (USDOT), Federal Highway Administration (FHWA). The news update explores Exploratory Advanced Research (EAR), Infrastructure, Operations, Safety, Program Development, Recent Research Publications, Recent Periodicals, and About FHWA R&T
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This manual provides guidance on performing refined analysis of bridges. The manual describes “refined analysis” and the methods allowed by the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD). Guidance for the modeling of typical girder bridges at various levels of complexity are
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Performance-based and data-driven approaches are increasingly employed by transportation professionals to provide a strong foundation for making sound decisions and for optimizing investments. This study developed and evaluated one such method for identifying and ranking traffic bottlenecks. Bottleneck analysis tools currently available to the Virg
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In cold regions, such as Alaska, using studded tires is common among the public when driving in icy and snowy conditions. However, studded tires cause extensive wear to asphalt pavement, reducing pavement life. Almost 22 years have passed since the Alaska Legislature completed an analysis of the impact on Alaska’s roadways from studded tire use. Th
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This report compares network-level friction measurements obtained with a Sideway-force Coefficient Routine Investigation Machine (SCRIM) and traditional locked-wheel skid trailer (LWST). The report also describes the results of two “harmonization” experiments at the two national LWST testing calibration facilities and recommends equations for conve
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The Health in Transportation Working Group 2018 Annual Report provides an overview of the Working Group’s activities and accomplishments in 2018, summarizes other U.S. DOT health-related accomplishments, and documents its progress towards meeting the goals laid out in the 2017 Annual Report. The report also offers goals for the Working Group 2019.
Based on prior studies, a 1 percent increase to in-place density (or 1 percent decrease in air voids) achieved through improved compaction was estimated to improve the fatigue performance of asphalt pavements between 8 and 44 percent and improve rutting resistance by 7 to 66 percent. In addition, a 1 percent increase in in-place density was estimat
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This document provides information and a how-to process for State Departments of Transportation and Local Public Agencies to consider Bridge Bundling for all funding sources. Topics covered include defining successful bridge bundling projects and programs, goals and objectives, funding and financing, coalition building, risk assessment, work types,
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This case study focuses primarily upon how the Northeast Ohio Areawide Coordinating Agency (NOACA) integrates transportation asset management into the metropolitan planning process. The case study was produced by the Federal Highway Administration (FHWA) Transportation Asset Management Expert Task Group (TAM ETG) as an example of how asset manageme
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Pavement surface texture plays important roles in roadway safety and noise issues. More than 32,000 deaths and 2.3 million injuries occurred in more than 6 million vehicle crashes in the U.S. in 2014 (NHTSA 2016) and about 16 percent of those crashes took place on wet pavement (FHWA 2016). The two main causes of wet weather crashes are: 1) hydropla
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The Department of Transportation Appropriations Act, 2019, allows States and territories to repurpose certain funds originally earmarked for specific projects more than 10 years ago. This memorandum provides the implementing guidance for this provision.
The National Household Travel Survey (NHTS) is the source of the nation’s information about travel by US residents in all 50 States and the District of Columbia. This inventory of travel behavior includes trips made by all modes of travel (private vehicle, public transportation, pedestrian and cycling) and for all purposes (travel to work, school,
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Effective performance measurement provides benchmarking for transportation agencies to promote transparency, accountability, cost-effectiveness, and process improvement. Vaisala’s proprietary “Grip” measure provides an imputed measure of the condition of the road surface (Jensen et al., 2014). VTrans’ Average Distribution Deviation (ADD) measures c
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