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.
A methodology to predict each stage of camber and displacements in composite prestressed concrete and steel bridge superstructures from inception to end of service life including a prediction of rebound in deck replacement projects is presented. The methodology invokes the use of multiple creep curves and allows the proper simulation of various con
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The goal of this research project is to improve the operational efficiency of shared-ride mobility-on-demand services (SRMoDS). SRMoDS ranging from UberPool to micro-transit have the potential to provide travelers mobility benefits that are comparable to existing ride-hailing services without shared rides such as UberX, but at a lower cost and with
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Pavement preservation is a strategy of maintaining a pavement’s functional condition at relatively low cost. By extending pavement life and enhancing pavement performance, preservation practices provide and maintain serviceable roadways in a cost-effective manner. To help with the pavement preservation decision-making process, the South Dakota Depa
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Unmanned aircraft systems (UAS) technology is proving to enhance State Department of Transportation (DOT) practices as an innovative and inexpensive solution that improves safety and accessibility, reduces cost, streamlines processes, improves workforce utilization, and accelerates several transportation operations activities. A few studies have be
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Snowplow trucks serve a crucial role in winter maintenance activities by removing, loading and disposing snow. An effective performance monitoring and analysis process can assist transportation agencies in effectively managing the snowplow trucks and maintaining normal functioning of roadways. Previous literature suggests that most snowplow truck p
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In the near future, ride-sharing vehicles are expected to serve a significant fraction of the transportation demands in cities and urban areas. In the past two decades, there has been an increased occurrence of highly infectious diseases like COVID-19 in the world. The simultaneous increase in ride-sharing penetration in the cities and the occurren
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Currently, asphalt mixtures are design using volumetric concepts to determine optimum asphalt content levels with no means of verifying mixture performance prior to field production and placement. A new design methodology called Balanced Mixture Design (BMD) promotes the use of evaluating and design asphalt mixture using rutting and fatigue crackin
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The project investigated the ability of Cellular Vehicle-to-Everything (CV2X) and Dedicated Short-Range Communication (DSRC) communication systems to accurately send and receive data between vehicles which have lost their line-of-sight due to occluding obstacles. A propagation model to predict received radio power is developed using WinProp. The po
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For the market introduction of electric vehicles to be successful first-time adopters need to make continual purchases of the vehicles. Discontinuance, the act of abandoning a new technology after once being an adopter, has implications for market growth and could prevent electric vehicles ever reaching 100% market share. In December 2019 we resurv
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Transportation and traffic safety is a primary concern among the Rural, Isolated, Tribal, or Indigenous (RITI) communities in the U.S. Although emerging technologies (e.g., connected and autonomous vehicles, drones) have been developed and tested in addressing traffic safety issues, they are often not widely shared in RITI communities for various r
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The fundamentals of rutting behavior for thin full-depth flexible pavements (i.e., asphalt thickness less than 12 inches) are investigated in this study. The scope incorporates an experimental study using full-scale Accelerated Pavement Tests (APTs) to monitor the evolution of each pavement structural layer's transverse profiles. The findings were
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Road traffic noise pollutes the living environment and has adverse effects on public health. It may be reduced at its source by a quiet pavement surface. This study investigated the relationship between design parameters of porous asphalt mixtures placed at the pavement surface and the pavement acoustic performance. A mechanistic-empirical model wa
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Real-time updating of traffic state and traffic flow parameters is important for effective real-time traffic control. Because of its simplicity, the Cell Transmission Model (CTM) has been widely used as the underlying traffic flow model based on which traffic state estimation algorithms were designed. A prominent feature of CTM is that for any give
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In highway construction, the nuclear density gauge (NDG) is the industry standard for measuring soil density and moisture. They are widely used at state transportation agencies, however, because of their reliance on radiation, NDGs are expensive to maintain and have unique storage requirements. Operators must also earn specialized certifications an
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The objective of this research effort was to evaluate two driver training programs by examining young driver performance and eye movements in a driving simulator. Training program content was assessed and potential hazards were selected across both programs for inclusion in the simulator drives. These were implemented as potential hazards that did
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This report provides a framework for experimental load rating of bridges via inclusion of low-cost dynamic sensors and dynamic tests. Currently 25% of the bridges in Nebraska are posted for live load. According to the National Bridge Inventory (NBI) in 2012, 93% of all postings in the US were based analytical load ratings, 7% were posted using fiel
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Despite the documented vulnerability of coastal bridges in recent tsunami events, no formal guidance exists to date for the tsunami design of such structures. To contribute to the development of such guidelines, this report presents the results of a numerical investigation into tsunami-induced loads on bridges. Following extensive validation of an
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The availability and quality of pedestrian infrastructure play key roles in enabling access to transit. Many transit operators face challenges in facilitating this access, however, because they lack land use authority and encounter other institutional and programmatic impediments to effecting changes in the pedestrian environment. This report ident
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Autonomous truck-mounted attenuators (ATMAs) promise transformative changes in mobile work zone operations by eliminating the need for a worker to operate an impact protection vehicle. The goal of this project was to pilot a demonstration of the ATMA technology, conduct an evaluation and assessment of the operational and safety functions of ATMA ve
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