This report proposes a redundancy factor to provide improved bridge system reliability using conventional component-based limit-state design. The redundancy factor is based on a system reliability assessment, and it provides a missing link between bridge component reliability and bridge system reliability. It is intended to provide more uniform bri
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Roosevelt Drive provides access to over 73,000 acres of the Beaverhead-Deerlodge National Forest and approximately 40,000 acres of Bureau of Land Management (BLM) lands, primarily in the Highland Mountains south of Butte. The corridor also serves numerous private residences and is highly used by permitted commercial timber, mining, and livestock gr
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The Federal Highway Administration’s (FHWA) GIS in Transportation program sponsored a peer exchange to bring together practitioners of Geographic Information System (GIS) applications to discuss and learn about how State Departments of Transportation (DOTs) and metropolitan planning organizations (MPOs) are leveraging GIS in their emergency managem
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United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2019-09-05
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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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The sinkhole associated with the Napoleonville salt dome in Assumption Parish, Louisiana, near Bayou Corne, threatened the stability of Highway 70–a state-maintained route. In order to mitigate any potential damaging effects to the highway and address issues of public safety, a program of monitoring, decision support, and research was implemented t
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This report highlights key recommendations and noteworthy practices identified from the Building out the 2.0 Bicycle Network peer exchange held in Washington DC on April 10-11, 2019. The peer exchange focused on traditional and emerging methods of bicycle planning analysis and implementation, with an emphasis on bicycle level of traffic stress (LTS
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This report summarizes work performed under contract #DTFH6117C0001 toward the development of PedPal, a prototype mobile (smartphone) app designed to assist pedestrians with disabilities when crossing the street at signalized intersections. PedPal interacts directly with the traffic signal system controlling the intersection to communicate both cro
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This Executive Overview highlights the contents of the reference manual developed for a FHWA/NHI training course on pavement preventive maintenance. Preventive maintenance, often summed up as "applying the right treatment to the right pavement at the right time," is becoming increasingly popular in highway agencies interested in overall pavement pr
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This handbook presents a methodology that will aid highway asset owners and maintenance personnel with determining what assets, beyond pavements and bridges, are most important to support their agencies' missions and goals. The methodology prioritizes asset classes and identifies data related to those assets that best support a performance-based ap
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2019-09-01
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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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United States. Department of Transportation. Federal Highway Administration. Office of Safety
2019-09-01
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In 2018, 36,560 people were killed in traffic crashes on the Nation’s roadways. In a concerted effort to reduce fatalities, most States have adopted a zero deaths vision or approach in their Strategic Highway Safety Plans (SHSPs). In addition, more than 40 communities have committed to Vision Zero, a strategy to eliminate traffic deaths and severe
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2019-09-01
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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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Corrosion of prestressing strands has required replacement of external post-tensioning tendons in several existing post-tensioned bridges. External tendons are commonly used in concrete box girder bridges constructed using the span-by-span or balanced cantilever methods. Currently in the US, external tendons are discretely bonded at anchorages and
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The Harbor Drive to Harbor Boulevard right-sizing project is an example of an at-grade freeway to boulevardright-sizing project that achieved economic development goals of recapturing additional land and revitalization. The project replaced the first limited access freeway in Portland, which had become less important since additional freeways were
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The Boston Central Artery/Tunnel Project, also known as the “Big Dig,” replaced the Interstate 93 viaduct in downtown Boston with a higher-capacity tunnel. On the surface, the project included a 1.5-mile-long park that is flanked by boulevards. The tunnel was created in response to traffic congestion and an inner city revitalization plan that sough
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The Central Freeway Project in San Francisco arose from public efforts to remove and rehabilitate a portion of the two-deck, 40- foot-high freeway to improve connectivity and livability in the Hayes Valley neighborhood. The freeway was a barrier separating the more upscale west side of the neighborhood from the lower income east side. Furthermore,
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The Federal Highway Administration (FHWA) and the Federal Transit Administration (FTA) define a transportation facility rightsizing project as one whose goal is to “match land use and transportation contexts appropriately on existing streets.” Rightsizing typically involves reducing the transportation facility footprint and repurposing the land mad
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Freight has a significant impact on the economy, on both the National and regional level. The transport of freight accounts for almost nine percent of the Gross Domestic Product in the U.S., which makes efficient freight and commercial truck travel essential to the country’s economic well-being. The freight system moves 55 million tons of goods wor
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The diesel repower/replacement project emission reductions calculator estimates emission reductions for repowering/replacing heavy-duty diesel vehicles (excluding transit vehicles) of a given model year with a newer diesel vehicle of a more recent model year. 1 Emission reductions are estimated by calculating the reduction in both running and start
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The on-road activity calculator is a tool that was designed to help calculate specific activity values for the diesel retrofit and repower/replacement tools based on aggregate activity data. Please use this tool if the following circumstance applies: You have more than one piece of activity data, none of which are specific to the desired vehicle ty
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