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.
Truck traffic is an important input for pavement design and analysis. Proper characterization of traffic patterns contributes to the design of reliable and cost-effective pavement structures. Axle load spectra obtained from the Long-Term Pavement Performance (LTPP) database, together with local Annual Average Daily Traffic (AADT) data from Tennesse
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The Virginia Department of Transportation (VDOT) implemented balanced mix design (BMD) performance testing for asphalt mixture design and production in the 2024 paving season. The BMD approach seeks to achieve asphalt mixtures that have properties to resist both cracking and rutting distresses and to increase durability. This implementation of BMD
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Speed-related crashes remain a critical concern for Texas, identified as one of the seven key emphasis areas in the Texas Strategic Highway Safety Plan (SHSP) for 2018–2022. Traditional crash risk models often overlook essential real-time factors such as operating speed, traffic variability, and weather, limiting their effectiveness. To address thi
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The plastics industry has been actively exploring new end-market opportunities for the more than 35 million tons of waste plastics generated annually. The use of recycled WP in asphalt presents an opportunity to improve pavement performance while reducing the growing amount of WP being landfilled or released into the environment. However, the use o
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This study evaluated the “Fully Softened Shear Strength (FSSS)” of soils in Nebraska based on a revised Cone Penetration Test(CPT) method. FSSS is a unique strength condition that soils show substantially reduced strength during rainy seasons, eventually causing failure of slopes and other structures. The revised CPT was adapted to inject water at
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This study developed and evaluated a 34-in.-tall Nebraska Department of Transportation (NDOT) thrie-beam approach guardrail transition (AGT) with an increased span between the concrete buttress end and the first transition post. The objective was to accommodate a wide range of common obstructions near bridge ends, including abutments, wing walls, d
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Electric vehicle fires present unique challenges for roadway incident management due to lithium-ion battery thermal runaway characteristics that can result in extended suppression durations, toxic emissions, and reignition risks. This study assessed the prevalence and operational impacts of electric vehicle fires through analysis of vehicle fire in
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This study addresses the persistent challenge of delivering cost-effective, high-quality on-demand transit in low-density communities. Traditional microtransit services often struggle in such areas due to high fixed costs and limited opportunities to consolidate trips, while community partnerships with transportation network companies (TNCs) like U
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This study developed a new approach to establish baseline load ratings for bridges in Kansas without plans using data from the National Bridge Inventory (NBI). The approach is comprised of linear regression models to estimate load ratings for bridges with a condition rating of 8 or higher and adjustment factors to lower the estimated load rating to
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Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and
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This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri
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This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri
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Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and
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This study sought to determine whether a change in motor vehicle access to a commercial property had a measurable impact on year-to-year changes in the number of customers visiting or in the volume of customer transactions, while controlling for other influences.
The purpose of this study was to examine the effect of different kinds of curb extensions in Washington, D.C. on both driver yielding behavior and on pedestrian crossing satisfaction. To explore these questions, we used a mixed methods approach of surveying pedestrians crossing the roads from 47 curb extensions and video data recording of driver yi
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This project evaluated practical strategies for improving the cracking resistance of asphalt surface mixtures in Alabama while ensuring adequate resistance to rutting. The study focused on Superpave surface mixtures commonly used by the Alabama Department of Transportation (ALDOT) and examined three types of adjustments: binder content and grade, a
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This study introduces a low-cost, scalable framework for monitoring and assessing the condition of paved trail infrastructure to enhance accessibility for all users, particularly those with limited mobility. The research utilizes a custom-built "Data Bike" with GPS and accelerometers embedded with high-resolution cameras to collect multimodal data
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This project examined truck parking capacity, demand, and utilization patterns along I-80 in Nebraska. The objectives were to (1) document the capacity of public and private truck parking facilities along I-80, (2) analyze spatial and temporal trends in parking demand, (3) develop models to predict occupancy at parking facilities, (4) identify clus
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The primary objective of this research was to evaluate the effectiveness of newly proposed methods (iCCL, UTFO, and WRI) for the low-temperature performance grading of asphalt binders by comparing them against the conventional Bending Beam Rheometer (BBR) test. Ultimately, this study aimed to determine whether these alternative methods can provide
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The objectives of this study were to synthesize BMD implementation and related research in the southeastern U.S. region on essential topics within the BMD framework through a comprehensive review of ongoing and completed studies on BMD procedures. The research team also conducted a two-round survey of current BMD practices to document the implement
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