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 objectives of this study were to evaluate the performance of stormwater best management practices (BMPs) used for stormwater quantity and quality control. Three field sites were tested to quantify hydraulic conductivity, infiltration, and solids removal efficiency. Removal efficiencies ranged from 12% to 35% of infiltrated runoff for VFS rangin
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This report summarizes results of a project that was completed to determine the benefits and drawbacks of using tack coat in micro-surfacing applications and identify the tack coat application rate that will result in the optimum interface bond strength and better performance for micro-surfacing applications using different tack coat materials. The
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Micromobility (defined as shared bikes, e-bikes and e-scooters) represent a significant opportunity to replace short distance trips made by personally owned vehicles (POVs) and provide first-and last-mile solutions for underserved public transit riders. This research develops a methodology for estimating the upper bound number of short-distance POV
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This study explores the challenges and opportunities that aviation market changes present for existing transportation governance structures and institutions. In particular, we examine the capacity of existing planning institutions–largely siloed in separate air and surface transport planning domains—to address the megaregional dynamics associated w
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ITD Research Report RP 175 developed an algorithm for determining a Gyratory Stability (GS) for asphalt mixtures based on the Servopac gyratory compactor. The GS describes the ability of asphalt mixtures to resist rutting, and it can be determined during the mix design stage using the gyratory compaction data. This study developed a modified algori
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Increasing the density of asphalt concrete materials is expected to result in significant economic and environmental benefits by increasing asphalt mix strength and reducing cracking and rutting. In addition, reduced air-void content is expected to reduce permeability and moisture-induced pavement damage. Reduced permeability is also expected to re
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California has many aggressive climate policies, primarily aimed at individual sectors. This study explores untapped policy opportunities for interactions between sectors, specifically between the transportation and the electricity grid. As electric vehicles become more prevalent, their impact on the electricity grid is directly related to the aggr
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Past research and planning has highlighted the existence of pedestrian injury disparities throughout the US and some local agencies have performed cursory analysis in Oregon. However, no statewide analysis of pedestrian injuries in Oregon has been completed to see how these injury outcomes differ by race and income. This report aims to help better
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KDOT extensively utilizes mechanically stabilized earth (MSE) walls, typically with coarse aggregate backfill. Previous projects K-TRAN: KSU-15-6 and K-TRAN: KU-15-5 tested the aggregate material from MSE walls under construction. KU identified that several of the clean aggregate samples contained some fines, likely from crushing of the aggregate,
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Accelerated Bridge Construction (ABC) in seismic regions is currently a research focal point. ABC is bridge construction that uses innovative planning, design, materials, and construction methods in a safe and cost-effective manner to reduce the onsite construction time that occurs when building new bridges or replacing and rehabilitating existing
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Reduced traffic volumes resulting from COVID-19, along with the strain on enforcement during the pandemic, are thought to have produced higher speeds and more aggressive driving. Understanding the magnitude of speeding and other driver behaviors requires measurement and contrast. This project quantifies reductions in volume and the resulting differ
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Reclaimed stabilized base (RSB) is a common technique utilized to rehabilitate roadways. RSB involves reclaiming the base material and adding a stabilizing agent to increase the strength and durability of the base/subbase structure. This technique involves pulverizing some of the existing pavement along with a portion of the underlying base materia
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Seasonal freeze-thaw weakening has a significant effect on pavement foundation performance. The seasonal freeze-thaw cycles cause extensive damage to the pavement from frost-related problems such as frost heave, frost boils, thaw weakening, total rutting, and degradation of mechanical properties. Changes in temperature of pavement foundation geomat
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Bridge-type overhead truss sign structures (OHTSS) are widely used over active highways across the United States. An OHTSS is comprised of a 3D truss and two support frames at each end. The structures are usually made of steel or aluminum. Many state DOTs use their own types of connections that are not documented in specifications. Since 2015, the
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The Institute of Transportation Engineers (ITE) released the Trip Generation (TG) 10th edition in 2017, which significantly updated its database, and some of its trip generation rates were substantially lower than those of earlier editions. This study aims to investigate the applicability of the TG 10th edition in various Virginia contexts and to r
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More and more city planners are taking into consideration smart mobility solutions to address transportation needs and central to smart transportation systems is access to real-time data. For example, self-driving cars offer independence for seniors and people with disabilities, greater road safety, cost savings through ride sharing, increased prod
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While ownership and purchase of all vehicles approach gender parity, to date electric vehicles (EV) are being purchased by far more men than women. Prior analysis from California finds no reason in the available data why this difference persists. This report extends that analysis across 12 other U.S. states with varying, but generally less supporti
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A spatial optimization model was developed for deploying, over the next two decades, hydrogen refueling stations for heavy-duty zero-emission hydrogen vehicles. The model assigns trips to vehicles by applying a routing algorithm to travel demand data derived from another model—the California Statewide Travel Demand Model (developed by the Californi
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Multimodal transportation systems (e.g., walking, cycling, automobile, public transit, etc.) are effective in increasing people’s travel flexibility, reducing congestion, and improving safety. Therefore, it is critical to understand what factors would affect people’s mode choices. With advanced technology, such as connected and automated vehicles,
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