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.
The objective of this planning-level study is to analyze a range of observed and anticipated conflicts among road users; define stakeholder-identified gaps in data and guidance for Complete Streets implementation with respect to the integration of freight activities; and develop planning, policy, and design recommendations to mitigate safety and op
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This research examines the safety challenges faced by Transportation Maintenance Technicians (TMTs) at the Alabama Department of Transportation (ALDOT). By analyzing extensive injury data from 2009 to 2024, along with insights from surveys and interactions with ALDOT personnel, this effort highlights significant trends and relationships among injur
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Accurate estimation of daily and annual aircraft operations at airports is vital for various objectives, including airport planning, funding allocation, and aviation forecasts. However, obtaining precise operational data from airports without control towers has been challenging. In 2018, the Florida Department of Transportation (FDOT) published an
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Coastal flood data and maps were developed using an ADvanced CIRCulation (ADCIRC) hydrodynamic model with resolution as fine as 30 m on the coastline. Annual exceedance probability (AEP) still water levels caused by storm surges were taken from the United States Army Corps of Engineers (USACE) South Atlantic Coastal Study’s (SACS) publicly availabl
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Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o
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Mobility hubs (MHs) can facilitate seamless transitions between various transportation modes, such as transit, ridehailing, and micromobility, enhancing multimodal travel and delivering socioeconomic benefits. To inform mobility hub planning and development in Florida cities and beyond, this project develops a multi-criteria, GIS-based MH site sele
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The majority of bridges in Texas are constructed with girders as simple spans. A simple-span deck requires expansion joints, which are sources of maintenance and durability issues. To avoid this, continuous decks, known as “poor boy joints” in Texas Department of Transportation (TxDOT) bridges, are an attractive option. These details are commonly k
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The service life of steel bridge coatings in Florida is occasionally shorter than the intended design life, resulting in the need for increased maintenance painting. This project examined the value of warranty terms potentially included in painting contracts to improve the quality and durability of steel bridge coatings. The research found that the
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This study evaluates the effectiveness of in-vehicle safety countermeasures in reducing injury risk for TMA (Truck-Mounted Attenuator) truck occupants during collisions. With increasing incidents involving TMAs in work zones, understanding the protective impact of advanced safety features has become crucial. A review of historical TMA crash reports
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This study evaluates the effectiveness of in-vehicle safety countermeasures in reducing injury risk for TMA (Truck-Mounted Attenuator) truck occupants during collisions. With increasing incidents involving TMAs in work zones, understanding the protective impact of advanced safety features has become crucial. A review of historical TMA crash reports
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Existing network criticality assessments, often biased towards heavily used highways in populous areas by incorporating traffic and sociodemographic attributes, can lead to an underestimation of the vital role of rural infrastructure. Consequently, rural highways, particularly low-volume roads, often receive less consideration despite their critica
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Non-motorized volumes at different locations in a transportation network are important data for understanding safety and travel needs for people who bike and walk. In Georgia, however, there are limited data about non-motorized volumes in transportation systems given, and in general, these modes volumes are difficult to predict due to high variabil
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The main objective of this research was to explore the optimized selection of superabsorbent polymer (SAP) products as internal curing materials in concrete and to examine the effects of the use of eight selected SAPs on properties that affect concrete performance, including shrinkage, hydration, permeability, and strength. Experimental results dem
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WYDOT maintains a vast network consisting of Interstate, NHS and non-NHS roads. The existing infrastructure needs continues maintenance to keep in good condition and safe for users. To achieve this, WYDOT needs a considerable amount of funding every year and anticipates the demand for future maintenance through performance models. This future maint
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In coordination with the American Trucking Association (ATA) and American Transportation Research Institute (ATRI), this project aims to address truck parking issues with short- and long-term solutions. The short-term solution is to identify what truck parking exists, how it is managed, and what and where Variable Message Signage (VMS) exists for t
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E-bike lending libraries are emerging as a potential tool to promote sustainable transportation, reduce greenhouse gas emissions, and enhance mobility equity across communities in the United States. By offering residents the opportunity to borrow e-bikes for periods ranging from a couple of hours to several months, these programs help address barri
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Nearly 30% of roads in the U.S. are unpaved, significantly impacting rural connectivity with Nebraska alone having approximately 75% unpaved roads. This study systematically evaluates local materials to improve gravel road performance, reduce maintenance frequency, and decrease financial burdens on counties. Survey responses revealed that nearly 70
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Transit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies o
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Post-construction roadside soils often suffer from compaction, low fertility, and poor structure, challenging vegetation establishment and stormwater management. This study evaluates the effectiveness of organic amendments (OAs) and proprietary amendments as alternatives to traditional methods. The study involves greenhouse experiments (pot and mes
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