The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Oversize and overweight (OSOW) trucks are an integral part of traffic movement throughout the state of Kansas and the United States as a whole, along with the freight they haul. The unique dimensions (length, width, height, and weight) of these loads makes the movement of them more challenging, and less safe for all on the road. With key east-west
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Non-structural overlays such as ultra-thin bonded wearing course (UTBWC), chip seals, and micro-surfacing are commonly applied as a preventive maintenance method to extend the service life of a pavement. They are generally placed over flexible substrates, which include flexible pavements that have received bituminous interventions on bituminous upp
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Certain blends of very fine sands, silts, and clays are producing pile rebound during driving. Two major high rebound items were evaluated during this research: the possibility of using new pile movement techniques during driving to validate or check pile driving analyzer (PDA) deflections and the evaluation of cyclic triaxial test data to determin
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This study was driven by the need to improve consistency in the methods and approach that local agencies use to address crosswalks. This study focuses on the question of how a crosswalk should be enhanced with additional countermeasures, if any, once the decision is made to mark it. During the research portion of this project, it was found that the
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Pedestrian-Activated Crossing (PAC) systems have been shown to have a generally positive impact on driver yield rates. However, there has been insufficient research on the effect PAC treatments have on pedestrian crash rates, and there is little guidance as to when and where each treatment should be used. This study estimates the effects of PACs on
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Load rating is the process of determining the safe load-carrying capacity of a bridge; however, when plans and details are insufficient to determine the overall capacity of the structure, alternative methods must be used to infer what the live load capacity is. Two viable methods allowed by the AASHTO Manual for Bridge Evaluation are the commonly u
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Spray on rejuvenators, designed to penetrate into the asphalt pavement to a certain depth, can be applied to hot mix asphalt (HMA) pavement surfaces, serving as a cost-effective method intended to reverse the effects of aging. Rejuvenators strengthen the HMA material at the surface to resist the detrimental effects of exposure to sun, water, and ai
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The Indiana Department of Transportation (INDOT) Central Hot Mix Asphalt (HMA) Acceptance Lab was opened on March 29, 2018 at the Office of Materials Management (OMM) facility in Indianapolis. The state-of-the-art lab conducts acceptance testing on HMA samples from INDOT’s Crawfordsville and Greenfield districts, as well as testing of appeals sampl
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Road traffic crashes are a leading cause of death in the United States. In Kentucky, per capita crash rates and crash-related fatalities have outpaced the national average for over a decade. Wanting to explain why the U.S. Southeast sees higher crash rates than other regions, researchers have argued the region’s unique socioeconomic conditions prov
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In 2009, the American Association of State Highway and Transportation Officials (AASHTO) published the Manual for Assessing Safety Hardware (MASH), which supersedes the previous crash test and evaluation guidelines. A MASH implementation agreement was jointly developed and adopted by the Federal Highway Administration and AASHTO. It establishes imp
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Adjacent box beam bridges are economical bridge systems for accelerated bridge construction. The box beams are constructed at precast plants and are traditionally connected by a shear key filled with grout. This system is typically used for short spans with low clearance restrictions. However, due to the grout deteriorating and debonding from the p
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In support of VTrans, this report summarizes potential changes in population, employment, and household income that are forecast from various sources and identifies potential transportation implications. Statewide, Virginia’s population is forecast to grow 24% to 33% from 2017-2045, with four regions clustered along the I-95 corridor (roughly the p
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Due to the success of the Missouri Department ot Transportation (MoDOT) 2017 Intelligent Compaction (IC) and Infrared Scanning (IR) projects that demonstrated quality control improvements on 13 field projects, MoDOT established a plan that included further IC and Paver-mounted Thermal Profile Systems (PMTPS) projects in 2018-2019 with a goal of ful
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Utah’s intermountain valleys along the western edge of the Wasatch Front contain widespread deposits of loose, saturated, cohesionless soils that are susceptible to liquefaction during major, nearby earthquakes. Liquefaction can induce ground deformations that can be very damaging to buildings, roadways, bridges, pipelines, buried structures, etc.
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The Indiana Department of Transportation (INDOT) is tasked with the stewardship of billions of dollars’ worth of publicinvested highway infrastructure. Not only does INDOT continually seek design and operational policies that foster cost effective project delivery and procurement, they also seek opportunities for revenue generation. Due to populati
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In 2007, the American Association of State Highway and Transportation Officials published a new policy requiring the application of the Load and Resistance Factor Design (LRFD) methodology for pile foundations. The Alabama Department of Transportation (ALDOT) currently uses LRFD, however, the LRFD resistance factor used is not based on reliability
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The Kansas Department of Transportation (KDOT) developed an automated permitting system called the Kansas Truck Routing and Intelligent Permitting System (K-TRIPS) to issue permits for all OSOW trucks. Using four years of data from K-TRIPS (2014‒2017), the research team developed a series of heat maps using ArcGIS to help visualize the routes OSOW
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This project aims to develop a demand-driven approach for shared mobility operations with machine learning and math programming methods. The objective of this approach is to incorporate economic, environment and equity impacts over an entire operational cycle. Both ride-hailing systems (e.g. Lyft) and ride-pooling systems (e.g. UberPool) will be in
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This project included four distinct but related exploratory studies of data sources that could improve roadway safety analysis. The first effort evaluated passively gathered crowdsourced bicyclist activity data from StreetLight Data and found promising correlations (R2 of 62% and 69% for monthly weekday and weekend daily averages) when the StreetLi
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