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.
External confinement of concrete columns by means of carbon fiber reinforced polymer (CFRP) wraps has proven to be an efficient technique for structural retrofitting and strengthening. This report presents an experimental investigation that was conducted to assess the residual compressive strength of CFRP wrapped 1/6-scale concrete columns using st
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This project seeks to investigate how RFID sensors can detect black ice remotely to reduce the number of accidents caused by this thin layer of ice when it is not visible. Black ice, sometimes called clear ice, is a thin coating of ice that is visually transparent and often hard for drivers to identify. The detection of this thin layer of ice is di
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The predominate bridge rail and approach guardrail transition (AGT) systems used among the New England states include details for 2-bar, 3-bar and 4-bar designs which were developed and tested under previous crash test standards (i.e., AASHTO GSBR PL2 and NCHRP Report 350). These basic designs are currently being implemented among various participa
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The predominate bridge rail and approach guardrail transition (AGT) systems used among the New England states include details for 2-bar, 3-bar and 4-bar designs which were developed and tested under previous crash test standards (i.e., AASHTO GSBR PL2 and NCHRP Report 350). These basic designs are currently being implemented among various participa
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There has been general trend to shift the location of warehouses and distribution facilities away from consumer markets (logistics sprawl) in Southern California. This shift has a negative impact on cost and the environment because freight vehicles have to travel longer to reach their destinations. However, during the last decade, this trend has no
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Future transportation system is expected to be in a hybrid form instead of the basic road-vehicle-passenger relationship that is still very common in most transportation systems. That is to say, future transportation will cover additional scenarios and different types of vehicles with partial or full automation. A very representative example is the
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California policy is incentivizing rapid adoption of zero emission electric vehicles for light duty and freight applications. In this project, we explored how locating charging facilities at California’s highway rest stops, might impact electricity demand, grid operation, and integration of renewables like solar and wind into California’s energy mi
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Studies of rail transit safety typically focus on collisions involving rail vehicles and other road users. Nonetheless, the introduction of new rail transit into a metropolitan area may result in changes to the design and use of streets and intersections that influence the safety of other road users. This study conducts a before-after analysis of t
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This white paper provides a high-level study of unmanned aircraft systems' flight operations that may benefit from the application of blockchain concepts.
Improving winter maintenance is a goal of most transportation agencies including the Nebraska Department of Transportation (NDOT). One approach is to develop a decision support system to aid in the winter maintenance recommendations. Iteris has developed a maintenance decision support system (MDSS) and has teamed up with NDOT to provide winter weat
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With nationwide declines in public transportation ridership, transit may be falling behind in its ability to help cities deal with congestion. Increasing real-estate values are causing the economic displacement of low-income populations, those most closely associated with transit ridership. A plethora of new mobility options are providing alternati
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STRIDE Project ID: STRIDE B2. Project Title: Evaluation of Work Zone Mobility by Utilizing Naturalistic Driving Study Data. Project Grant Period: August 16, 2018 – August 15, 2019The original SHRP 2 data that was utilized in this study cannot be uploaded to the repository The SHRP 2 data is only available through a Data Use License, and can only be
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The United States has witnessed several natural disasters in recent memory. Natural disasters such as hurricanes, wildfires, and floods not only cause extensive monetary damages but also lead to spatiotemporal displacement of affected residents. Often, in these scenarios, governments at various levels – state/regional/local – grapple with how to ef
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Consumer Product Safety Commission. Office of Hazard Identification and Reduction
2020-04-08
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Use of micromobility products, including electric scooters, electric bicycles, and self-balancing scooters, has increased in recent years with advancements in battery technology and the advent of commercial ride-sharing services. Consumer Product Safety Commission (CPSC) staff have identified potential mechanical, electrical, and human factors haza
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This data supports the findings from a multi-institutional effort for analyzing and improving freeway travel time reliability. The final report, " Freeway Management for Optimal Reliability" is linked in this repository.The Data zip file contains outputs from GTsim software and a R script to analyze the outputs.
This project used results of a national survey to collect life expectancies of bridge activities and the durations of construction to do those activities. The national survey also showed the current use of contractors, in-house staff and combinations to execute those activities. In addition, the national survey provided input from 11 agencies on pr
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In this report, the detailed processes and methodologies required for implementation of the evaluation framework for the proposed Freight Project Prioritization Decision Support System are discussed. Research reports and guidelines at the federal level are referenced for the development of the methodologies. The evaluation framework produced a stan
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The National Pollutant Discharge Elimination System General Permit No. 2 requires the Iowa Department of Transportation (DOT) to develop a stormwater pollution prevention plan for all construction activities that are covered by the permit. The Stormwater Pollution Prevention Plan includes the design, installation, and maintenance of erosion and sed
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Due to the relatively high cement content and low water-to-cement ratio (w/c) used, bridge deck concrete is prone to premature cracking. Internal curing has been found to greatly reduce the chance of premature cracking as well as concrete deterioration. This research project was intended to develop internally cured bridge deck concrete based on a l
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The main objectives of this project were to review the available balanced-mix design (BMD) methodologies, understand the I-FIT and Hamburg Wheel Tracking Test (HWTT) test methods using INDOT asphalt mixtures, and to explore the application of these tests to both a BMD approach and as performance-related Quality Control (QC) and Quality Acceptance (
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