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.
Connected vehicles (CVs) are equipped with advanced technologies that allow them to communicate with infrastructure, other vehicles, and external systems. Meanwhile, transportation agencies maintain networks of road weather information systems (RWIS) that monitor weather and pavement surface conditions and communicate these conditions to agency per
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Studies by the Federal Highway Administration show that American Indians have higher rates of pedestrian injury and death per capita than any other population group in the United States. The Minnesota Department of Transportation (MnDOT) has identified Native Americans as one of six priority populations in Minnesota that face disproportionate risks
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Asphalt concrete pavement surrounding utility structure covers is prone to settlement, cracking, breaking up over time, and potholing, and these distresses are particularly common in wet-freeze climates (e.g., Minnesota). Several factors contribute to their formation, including design requirements, collar material type and cut shape, construction p
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Thin fiber reinforced concrete (FRC) pavements and overlays can be economical for low- and moderate-traffic volume roads. Due to insufficient concrete cover thickness, thin concrete pavements or overlays cannot accommodate dowel bars that are typically used in conventional thick concrete pavements. The critical distress for such applications is the
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Massachusetts is home to millions of trees located not only in forests but also along streets and roadways in urban, suburban, and rural environments. The people living in these communities rely on street trees to provide necessary ecosystem services, such as shading and cooling, or stormwater mitigation. MassDOT has developed a comprehensive capit
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Recently, speed management practices have shifted away from an historical focus on the 85th percentile speed toward a safe systems approach that is focused on promoting safer speeds in all roadway environments through a combination of thoughtful, equitable, context-appropriate roadway design, appropriate speed-limit setting, targeted education, out
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Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c
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Across the United States, aging roadway infrastructure has led state departments of transportation (DOTs) to increase their focus on pavement rehabilitation projects. These projects upgrade existing infrastructure to meet the needs of current levels of vehicle use. On interstate rehabilitation projects, maintenance of traffic (MOT) is an especially
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To reduce the environmental impact of transportation, Departments of Transportation (DOTs) are incorporating cold-recycling technologies such as Full-Depth Reclamation (FDR) as an alternative for pavement rehabilitation. One of the limitations hindering the deployment of FDR is the limited information available on the material properties of these m
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Stormwater treatment practices, often referred to as stormwater best management practices (BMPs), require a substantial commitment to maintenance, including regular inspections and assessments. Existing regulations require governmental units to develop a systematic approach for ongoing inspection and maintenance to ensure that they are achieving th
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To reduce highway fatalities after dark, the U.S. Federal Highway Administration (FHWA) issued new requirements for pavement marking “retroreflectivity” (the measure to which pavement markings reflect headlamp light back to its source). This standard has been incorporated into the Minnesota Manual on Uniform Traffic Control Devices (MN MUTCD) and a
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Traditionally, the Missouri Department of Transportation (MoDOT) has performed bridge load ratings using a method called load factor rating (LFR). With changes to bridge design and heavier vehicles traveling Missouri’s highways, MoDOT is working to adopt an updated system called load and resistance factor rating (LRFR). The primary goal of this stu
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This report examines the evolving landscape of technician training in Illinois’ transit industry, with a particular focus on electric vehicle (EV) technology. The report aims to identify the current challenges, explore collaborative training initiatives between community colleges and transit agencies, and provide actionable recommendations to the I
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Poor structural properties and nutrient profiles of disturbed soils often require supplemental organic matter for promoting better vegetation establishment. Compost and compost-related products, when added to soils, have proven to enhance plant growth and improve infiltration of rainwater, thereby mitigating soil erosion and excess nutrient release
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The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics to research Complete Streets best practices and assess New Jersey’s existing Complete Streets activities. The Complete Streets concept is comprised of approaches to planning, designing, and operating roadways and rights-of-way with all road users in mind, making the t
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The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics to research Complete Streets best practices and assess New Jersey’s existing Complete Streets activities. The Complete Streets concept is comprised of approaches to planning, designing, and operating roadways and rights-of-way with all road users in mind, making the t
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The overarching objective of this project is to identify settlement criteria for embankments and retaining walls and develop a systematic soil improvement design tool to facilitate the method selection and construction time and cost estimation. There is a consensus that the post-construction settlement has profound impacts on the service conditions
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Iowa State University. Institute for Transportation
2024-06-01
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The main purpose of the proposed research is to develop a mix design procedure for high RAM mixtures with both rejuvenators and fractionated RAM materials for Iowa DOT and local public agencies by thoroughly understanding complex interactions between fractionated RAM and rejuvenators. Main objectives of this research are to: 1) examine the effects
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The goal of this project was to develop, investigate, and implement optimized concrete mixtures to be used in closure pour connections between precast elements in side-by-side accelerated bridge construction (ABC) superstructure systems. This project involves the use of innovative materials and mixture proportions that are intended to provide high
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Urban transportation systems face challenges in providing connectivity, particularly for the first and last miles of commuters' journeys. Micromobility services, exemplified by e-scooters, have emerged as potential solutions to bridge this gap and enhance the efficiency and accessibility of public transit. As transit ridership demonstrates declinin
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