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 Division of Aeronautics (DOA) has been working toward a robust Advanced Air Mobility (AAM) and Unmanned Aerial Systems (UAS) Program that could benefit both state agencies and commercial partners/operators. Over the past few years, the DOA office has been working with Utah Lawmakers to develop a regulatory framework. A Statewide Drone Registrat
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The Louisiana Department of Transportation and Development (DOTD) and other agencies continually identify techniques to reduce roadway maintenance and construction costs. One common approach to this task is the introduction of asphalt mixtures with a smaller nominal maximum aggregate size (NMAS) for utilization in roadways. Excessive stockpiles of
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The primary objective of Task 6 was to develop guidelines, recommendations, and a decision- making tool based on extensive laboratory performance evaluation of the selected sealers and coatings (Task 3, Chapter 3 in the Research Report [R1]) under both normal and accelerated weathering (QUV and QFOG exposure) followed by developing a rating system
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The late merge, or “zipper” merge, has become a common strategy to increase work zone capacity by encouraging drivers to stay in their lanes until they reach a defined merge area, where they alternately merge. While the zipper merge has been shown to provide improved operational performance, there is considerable variability in driver familiarity a
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Running red traffic signals is a major cause of traffic collisions and resulting injuries and fatalities. Despite extensive prior work on systems to reduce red light violations, they continue to be a major problem in practice, partly because existing systems suffer from the flaw of providing the same guidance to all drivers. As a result, some viola
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This study estimated and analyzed the travel-time reliability (TTR) and traffic-flow measures of effectiveness (MOE) for 74 directional corridors in the metro freeway network in Twin Cities, Minnesota, from January 2018 to December 2023, for both morning and afternoon peak periods. The network-wide trends for both TTR and MOE indicate that the traf
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The implementation of e-ticketing in Iowa has the potential to improve jobsite safety, save time, improve project documentation, and standardize data collection.
The western massasauga (Sistrurus tergeminus) and the timber rattlesnake (Crotalus horridus) are protected under Nebraska Statute 37-801-811 and listed as threatened species. These species occur in the right-of-way (ROW) along several roads in Jefferson, Gage, Pawnee, and Richardson Counties which necessitates the need for added Environmental Revie
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This research project summarizes various aspects of pedestrian crossings, focusing on rural roads in Minnesota. The project seeks to provide a comprehensive overview of pedestrian crossings for both pedestrians and drivers by examining Minnesota statutes, summarizing key features of pedestrian crossings, synthesizing findings from existing research
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With increasing trends and public requests for crosswalks, agencies are seeking resources on best practices and guidance for pedestrian crossings to improve safety, comfort, and consistency of the transportation network. This guidebook provides a comprehensive overview of rural pedestrian crossings for both pedestrians and drivers by examining Minn
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This report presents two major aspects related to the end-zone behavior of prestressed concrete bulb-tee girders: i) laboratory experiments and ii) full-scale finite element modeling. The first part of the report discusses the behavior of anchorage zones, also known as end zones, with discrete rebars and continuous meshes. To examine the implicatio
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This report examines the relationships between the characteristics of transit-oriented development (TOD) and (1) the use of transit and non-motorized modes (walking, cycling, scooting) and (2) local shopping behaviors and behavioral changes during and after the COVID-19 pandemic. The team gathered data from 341 respondents via an online survey and
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This report examines the relationships between the characteristics of transit-oriented development (TOD) and (1) the use of transit and non-motorized modes (walking, cycling, scooting) and (2) local shopping behaviors and behavioral changes during and after the COVID-19 pandemic. The team gathered data from 341 respondents via an online survey and
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Through this research, NJ TRANSIT sought to understand how women and members of the lesbian, gay, bisexual, transgender, queer plus community, sometimes referred to as sexual and gender minorities (SGMs) travel on NJ TRANSIT so the agency can provide better accommodations for all customers, regardless of sexual orientation or gender identity. The o
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Through this research, NJ TRANSIT sought to understand how women and members of the lesbian, gay, bisexual, transgender, queer plus community, sometimes referred to as sexual and gender minorities (SGMs) travel on NJ TRANSIT so the agency can provide better accommodations for all customers, regardless of sexual orientation or gender identity. The o
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This document presents a curated collection of vintage mid-20th-century advertisements from The Timken Company, a pioneering manufacturer of roller bearings for railroad applications. Compiled by Edwin R. Kraft in December 2024, the collection emphasizes Timken’s promotional campaign for “Roller Freight,” a term highlighting the adoption of roller
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This research addresses the application of high-strength reinforcing steel in Texas bridge construction. The project involved experimental and analytical work to evaluate the effectiveness of current design recommendations for high-strength reinforcing steel in various bridge structural components. These components include spliced beam, CIP-PCP dec
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The Minnesota Department of Transportation (MnDOT) recognizes the importance of subsurface drainage in pavements. Various studies have indicated that adequate drainage of pavement layers enhances performance of pavements in general. MnDOT thus uses various types of subsurface drainage in varying degrees of styles, frequency of use, and minor variat
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The late merge, or “zipper” merge, has become a common strategy to increase work zone capacity by encouraging drivers to stay in their lanes until they reach a defined merge area, where they alternately merge. While the zipper merge has been shown to provide improved operational performance, there is considerable variability in driver familiarity a
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