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.
Although Vehicle-to-Pedestrian (V2P) communication can significantly improve pedestrian safety at a signalized intersection, this safety is hindered when pedestrians do not carry hand-held devices (e.g., Dedicated short-range communication (DSRC) and 5G enabled cell phone) to communicate with connected vehicles nearby. To overcome this limitation,
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This project is focused on enhancing road weather management during wildfires, flash floods, and other extreme weather through data collection, sharing, and public dissemination technologies. Three areas of focus include research and practical findings regarding best practices in roadway operations, a curated data catalog relevant to roadway manage
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Pavement markings serve an important role on the highway and must be visible in day, night, and wet conditions. Pavement markings placed in grooved pavement are receiving considerable interest due to their potential for greater durability by providing protection from plow blades used during winter maintenance. Raised pavement markers (RPMs) are als
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Tee Bridges The most common type of bridge on South Dakota local roads is a precast prestressed double-tee (DT) girder bridge. More than 700 DT bridges are currently in-service in South Dakota. Structural detailing, aging, traffic volume, and environmental conditions affect structural performance, integrity, and capacity of DT bridges. When a bridg
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This project builds an open-source, socio-transportation analytic (STAT) toolbox for public transit system planning in an effort to integrate social media and general transit feed specification (GTFS) data for transit agencies in evaluating and enhancing the performance of public transit systems. This toolbox is novel and essential to transit agenc
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Currently, the Idaho Transportation Department (ITD) does not have an inventory of MSE walls, or procedures for their inspection and assessment. To initiate a process for compiling such information, this study collected information about MSE walls in Idaho, and assembled the material for use as a preliminary database. After considering many attribu
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This project investigated large streams of truck Global Positioning System (GPS) data for statewide freight modeling and planning applications in Arkansas. Approximately 5% of the trucks represented movements entirely within state boundaries with average trip lengths of 30 miles and durations of 1 hour; 22% represented in and outbound movements wit
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Transportation professionals measure traffic signal system to improve efficiency and reliability of roadway network. Traffic signal performance measurement and visualization provide insights as operational tools to help traffic management center get more benefits from infrastructure investment. The primary objective of the research is to identify a
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This study characterizes the effects of traffic-related criteria air pollutants (particulate matter [PM]₂.₅, PM₁₀, ozone [O₃], nitrogen dioxide [NO₂]) on children with asthma living in near-road communities. The authors utilized portable air quality monitors to characterize air pollutants in near-road schools and conducted a concurrently panel-base
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The present study investigated primarily the appropriate stone-sizing of on-grade riprap aprons, and more specifically whether the current INDOT design policy may be overly conservative especially within the context of smaller culverts. In the study, laboratory experiments were performed with two pipe diameters, D = 4.25 in (0.35 ft) and 5.75 in (0
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This focus of this study commissioned by the Idaho Transportation Department Freight Office is on developing freight data that allows for a detailed understanding freight movement within and through the state and an improved understanding of the key freight supply-chains supporting the state’s economy. Choices regarding infrastructure improvements
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Federal track safety regulations require railroads to inspect all tracks in operation as often as twice weekly. Railroad companies deploy expensive and relatively slow methods using human inspectors and expensive automated inspection vehicles to inspect and monitor their rail tracks. The current practices are not only expensive and decrease rail pr
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It is critically important to predict the corrosivity of fill materials in mechanically-stabilized earth (MSE) walls which can cause corrosion of steel reinforcement and lead to structural failure. A common way of assessing the corrosivity of fill materials is to analyze readily soluble constituents such as chloride and sulfate. In this study, fill
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This study looked at factors related to freight trip generation in Washington, DC and urban environments. The study presents a comprehensive review of literature and practices regarding loading zones at different US cities; collected commercial vehicle parking occupancy data through video-monitoring at 20 different buildings in the District of Colu
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The Arizona Department of Transportation (ADOT) Research Center hosted a peer exchange in Phoenix, Arizona, on April 9 and 10, 2019. The peer exchange was aimed at identifying exemplary practices for engaging internal DOT stakeholders throughout the entire research process. Representatives from Iowa DOT, Mississippi DOT, Montana DOT, North Carolina
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Using regular concrete or mortar to repair potholes in concrete bridge decks is typically infeasible in cold weather due to extended set and curing times. However, several commercially available rapid-set repair materials can be used at temperatures near or below freezing. This study evaluated five such materials to assess their properties and dete
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California’s Freeway Service Patrol (FSP) is a congestion mitigation program managed in partnership with metropolitan planning organizations (MPOs), CHP and Caltrans on California’s urban freeways. The program utilizes a fleet of roving tow and service trucks designed to reduce traffic congestion by efficiently getting disabled vehicles running aga
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As the price of liquid asphalt continuously climbs, methods are being sought to decrease material costs, which will also have less impact on ecological systems without compromising material or pavement performance. The use of recycled materials is one method that can replace a percentage of their virgin counterparts, thus reducing the negative impa
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This report presents the field implementation results of three directional rumble strip (DRS) patterns designed to deter wrong-way (WW) freeway entries. Southbound off-ramps at Exits 208 and 284 on I-65 in Alabama were selected for implementation because they were ranked as high-risk locations by a network screening tool developed by Auburn Univers
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In this project the researchers studied a correlation between molecular structure and corresponding compositional analysis of asphalt binders of conventional hot mix asphalt (HMA) mixtures as well as mixtures containing reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) with their cracking potential at intermediate temperature.
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