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.
This research examines the value of financing infrastructure improvements through bonding versus a program of pay-go improvements. Postponed construction becomes more costly in nominal terms because inflation raises the cost of construction over a longer period before construction begins. However, postponements can also create a variety of other si
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The Highway Division of the Iowa Department of Transportation (Iowa DOT) engages in research and development for two reasons: first, to find workable solutions to the many problems that require more than ordinary, routine investigation; and second, to identify and implement improved engineering and management practices. Detailed information on each
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The objective of this project was to create a book that encompasses the Iowa Highway Research Board’s (IHRB’s) history and funded projects from 2000 to 2024.
This guide equips public agencies with considerations to select, use, and evaluate cutting edges that deliver the best return on investment. Choosing the right cutting edge for snowplowing or blading gravel roadways is essential to maximize performance, reduce costs, and protect both roads and operators. The best blade depends on surface type, plow
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Air pollution from fugitive dust poses a significant health risk to the population in rural and arid regions. Conventional chloride-based suppressants offer temporary dust control, leading to soil contamination and infrastructure corrosion. This study proposes the synthesis of a starch-based powder that regenerates into a hydrogel for dust mitigati
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Pedestrian fatalities on high-speed, multi-lane roads in Texas, particularly in San Antonio, Houston, and Dallas, highlight an urgent need for focused interventions at midblock crossings. These sites often serve vulnerable populations and connect neighborhoods to transit, retail, and essential services, yet their safety challenges are magnified by
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The Alabama Department of Transportation (ALDOT) is currently using the Alabama Design and Analysis of Pavement Thickness (ADAPT) software for their structural pavement design process, which is based on the 1993 American Association of State Highway and Transportation Officials (AASHTO) Pavement Design Guide. In 2008, the American Association of St
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This document is a technical summary and supplement to the Florida International University report, A Framework for Field Inspection of In-Service FRP Reinforced/Strengthened Concrete Bridge Elements (FIU- 800014727), available at https://rosap.ntl.bts.gov/view/dot/73333. The document additionally offers technical findings beyond those provided in
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The primary objectives of the proposed study are listed below: (1) To identify the possible procedures and a list of candidate continuous friction measurement equipment (CFME) technologies to evaluate pavement friction at different test speeds and operational conditions. (2) To assess the feasibility and possible benefits from the list of candidate
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Pile foundations were often driven into intermediate geomaterials (IGM) to support heavy civil infrastructures like bridges due to shallow bedrock stratigraphy. Thus, the pile foundations of this region must rely on the resistance contributed from the IGM layers. However, IGM is a transitional geomaterial between soil and rock, that needs to be bet
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This report examines some of the economic and real estate impacts of Connecticut’s CTfastrak and Hartford Line transit systems through a multi-phase, data-driven study. Findings reveal evidence that proximity to transit stations is associated with increased property values, higher property tax revenues, reduced residential and commercial vacancies,
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Research was undertaken to determine the effectiveness of various speed warning technologies across a variety of critical speed-change contexts in order to provide guidance to support future installation and operation of such treatments in Michigan. The speed warning technologies evaluated in this research included dynamic speed feedback signs (DSF
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Departments of Transportation need measurement tools to (1) assess and track over time populations and geographies where mobility investments are needed, (2) assess what is driving the mobility needs of different populations and geographies so as to identify possible interventions, and (3) evaluate the impact of department investments on mobility.
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Roadside vegetation composition assessment is essential to maintain ecological stability, control invasive species, and to ensure the adoption of environmental regulations around construction zones. Traditional monitoring methods involving visual inspections are time-consuming, labor-intensive, and not scalable. Remote sensing offers a valuable alt
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Temporary bridges are systems designed for an expected service life of 5 years. In 2011, the California Department of Transportation issued a memo to designers advocating the use of design spectra corresponding to a return period of 100 years for temporary bridges. However, broad consensus on the most appropriate hazard level and design approach is
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This project investigated the use of evolving machine vision technologies to improve asset management procedures. Machine vision is technology that enables machines to “see” and interpret images, similar to how humans see and understand the world. It includes capturing an image, analyzing the image, and then completing and action or decision based
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MaineDOT has a family of transit plans that have been developed over the past five years through collaborative efforts with partners and stakeholders. These plans share similar themes, guidance, and recommendations and tie into the Department’s Long-Range Transportation Plan, which was completed in 2023. This report complements those plans, reviewi
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This study developed a data-driven geospatial tool to optimize emergency response strategies for vehicle crashes in Kansas. The tool analyzed more than a decade of crash data from the Kansas Department of Transportation (KDOT) and the Fatality Analysis Reporting System (FARS) to provide insight into T1 (crash to emergency medical services [EMS] not
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This study developed a data-driven geospatial tool to optimize emergency response strategies for vehicle crashes in Kansas. The tool analyzed more than a decade of crash data from the Kansas Department of Transportation (KDOT) and the Fatality Analysis Reporting System (FARS) to provide insight into T1 (crash to emergency medical services [EMS] not
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