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 Federal Highway Administration currently requires pavement and bridge National Highway System assets to be managed through a formal plan at the statewide level regardless of ownership. The methods for Transportation Asset Management planning for pavements and bridges are relatively well defined and mature. To incorporate evolving technologies a
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The objective of this research is to identify potential energy harvesting technology for applications on roadways and bridges and conduct feasibility analysis and performance evaluation of selected technologies for large-scale and micro-scale energy generation. The research outcome provides recommendations for future implementation of energy harves
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This research advanced Geotechnical Asset Management (GAM) within DOTD. It describes the logic and software utilized to develop the DOTD retaining wall inventory and outlines a GAM path forward for the Department. The developed GAM GIS database provides geospatial locations, digital storage, digital rating applications, and visual interfaces for re
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The U.S. Geological Survey (USGS), in cooperation with the Colorado Department of Transportation, developed peak-, mean- and low-streamflow regional-regression equations for estimating various streamflow statistics for natural streamflow in central and western Colorado. At the completion of the streamgage selection process, a total of 418 streamgag
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Cracks weaken concrete and permit water and harmful chemical ingress into structures. Shrinkage also decreases the load-carrying capacity of bridges. This study investigates shrinkage cracking prevention of infrastructure concretes used in New Jersey. The 15 initial evaluation mixtures were first tested to evaluate their shrinkage behavior. Based o
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This project included collection of UHPC connection details utilized by other states and examination of those details for applicability to use with the OU J3 non-proprietary UHPC, examination of different fiber sources and the effect of those fibers on properties of the OU J3 UHPC mix, consultation on and monitoring of UHPC projects in Oklahoma, an
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The Louisiana Department of Transportation and Development (DOTD) District 05, which is in the northeastern corner of the state, spent 55,000 hours and over $1 million in 2016 attempting to maintain roadway edges along non-paved shoulders. Non-paved shoulders consist primarily of a soil and aggregate mixture, which is routinely disturbed and lost u
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Construction and concrete production procedures are time sensitive and fast paced. As such, it is crucial to monitor the strength of concrete in real-time. Existing concrete strength testing methods, such as traditional hydraulic compression method specified by ASTM C 39 and the maturity method specified by ASTM C 1074, can be inaccurate, labor int
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With the expected arrival of autonomous vehicles, and the ever-increasing levels of automation in today’s human driven vehicles, road safety is changing at a rapid pace. This project aimed to address the need for an efficient and rapid method of safety evaluation and countermeasure identification via traffic encounters, specifically traffic conflic
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The objective of this project was to develop a model to predict friction that could be applied at the network level to overcome some of the issues associated with friction measuring equipment. This project developed an instrument that can collect high-resolution surface profiles to determine macrotexture and microtexture under different conditions
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The development of Autonomous vehicles (AVs) has brought many opportunities but implementing AV-based public transportation services has numerous unforeseen issues. One primary research gap is that existing studies on AV transit systems consist of predictions and speculation without actual cases and data support. Another issue is that a measurement
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The project is to identify energy harvesting applications on roadways and bridges and conduct feasibility analysis and performance evaluation for large-scale and micro-scale energy generation. Solar energy harvesting can be achieved using different assets of roadway. The technical and economic feasibility of solar array in the right-of-way (ROW) wa
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During the lifecycle of a bridge, deterioration of the concrete deck originates from many sources, e.g., corrosion due to water infiltration in conjunction with chlorides from the use of de-icing salts. Such deterioration may be affected by any one of the following six actions relevant to a bridge from conception to demolition: design, construction
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The purpose of this research was to develop a simple alternative to flexural fatigue testing for ensuring the fatigue performance of Interlayer Mixture Designs (IMOs) in Wisconsin. The research approach involved producing 15 different mixtures and characterizing these mixtures using the CT index as determined from the ideal CT test, and characteriz
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The study aims to improve the longevity and performance of New Jersey transportation infrastructure by reducing the concrete shrinkage and cracking potential and limiting the ingress of water and other deleterious substances into the concrete. Innovative techniques and materials for preventing shrinkage were studied in New Jersey materials and cond
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The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation (ODOT), evaluated the effects of cold-weather chloride deicers (road deicing chemicals) on groundwater quality, with a focus on chloride, near the Siskiyou Pass in southwestern Oregon. The study covered the period during July 2018 through February 2021. Between
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This project analyzes the impact that idling and snowfall have on the fuel consumed by MnDOT’s snowplow fleet, with the underlying objective to determine and advise MnDOT on ways to reduce fuel usage of the fleet using vehicle telematics data. This is a significant problem to solve as fuel use reduction contributes to MnDOT’s sustainability goals o
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This research evaluated the effectiveness of different strategies like RAP and soil with additives like fly ash and cement as possible shoulder material solutions to reduce and hopefully eliminate the edge drop-off safety issues within the state. This research evaluated the application, performance, and cost-effective solutions of different alterna
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United States. Department of Transportation. National Highway Traffic Safety Administration
2023-01-01
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National Transportation Statistics (NTS)
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PDF
In 2020 there were 6,549 people 65 and older killed in traffic crashes in the United States, accounting for 17 percent of all traffic fatalities. From 2019 to 2020 there was a 10-percent decrease in the number of people 65 and older killed in traffic crashes.
The research objective of this project is to study the behavior of the curved full integral abutment bridge designed in Nebraska through field monitoring and numerical simulation to 1) understand and model the complex short-term and long-term behavior of curved integral abutment bridges, 2) evaluate if the details provided in Nebraska (pile embedme
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