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.
Diesel has been used widely as an asphalt cleaning agent due to its effectiveness for many years. However, its negative impact on health and the environment calls for more sustainable and safe alternatives. Asphalt Release Agents (ARAs) are products for preventing or mitigating undesirable adhesion of HMA to the asphalt equipment, and Asphalt Clean
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The New Jersey Department of Transportation Bureau of Safety, Bicycle & Pedestrian Programs (BSBPP) engaged Cambridge Systematics (CS) to assist with the development of the current Highway Safety Improvement Program Implementation Plan, which was a necessary document that BSBPP had to develop after not meeting their Federal safety performance measu
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As the portable weight-in-motion (WIM) technology has been successfully explored and practically used to collect site-specific traffic data in Texas Department of Transportation Research Project 0-6940 Develop System to Render Mechanistic-Empirical Traffic Data for Pavement Design, this standardized guideline was developed to aid users understand m
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On-road measurements of four pollutants (PM2.5, PM10, NO2, and O3) were continuously recorded by three U.S. EPA-certified FEM air pollution monitoring devices installed inside a vehicle traveling repeatedly on the same route in a near-road community. Spatio-temporal on-road air quality data were aggregated and compared to data collected at two fixe
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The U.S. Department of Transportation (DOT) is leading a Safety Data Initiative (SDI), to enhance the analysis and visualization that informs safety policy decisions. Populus was selected to perform analysis and assess the quality of leveraging GPS trip trace data from micromobility operators such as Lime, Bird, and Superpedestrian (LINK), to serve
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In this review of seismic bearings, a compendium of public domain resources provides off-the-shelf, state-of-the-art bearing types, manufacturers, researchers, and load-deformation response data. Performance of two select seismic bearings, one generally available and one proprietary, is then assessed using finite element modeling and simulation. Th
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The Hartford Line, a heavy rail commuter line connecting New Haven, Hartford, CT, and Springfield, MA, with stations built and/or planned for in eleven Connecticut municipalities, received final funding approval in 2012 and opened for service in June 2018. This new commuter service may be encouraging additional transit-oriented development (TOD) al
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This study evaluated the impacts of speed limit increases that occurred following the enactment of Michigan Public Acts 445 and 447 of 2016. Between May and June of 2017, the maximum speed limits were increased from 70 to 75 mph on 614 miles of rural, limited access freeways. During the same period, the speed limits were increased from 55 mph to 65
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CTfastrak, a bus rapid transit service connecting four municipalities (Hartford, West Hartford, Newington, and New Britain) in Central Connecticut (CT), opened for service in March 2015. This new service may be encouraging transit-oriented development (TOD) along the busway and these potential impacts of CTfastrak are expected to affect property va
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The research team derived local calibration factors for models for urban freeway segments with 4–10 lanes and assessed the applicability of the 10-lane urban freeway model to freeway segments with 12 lanes. To accomplish this objective, the researchers assembled a database of about 2,400 urban freeway segments and over 80,000 crashes from the years
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This research identified that few studies on the application of the 3D STM to drilled shaft footings subjected to biaxial loading have been conducted. However, many biaxial load cases are considered when designing in-practice drilled shaft footings. While this project has added some refinements, most of the design recommendations proposed by Projec
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The purpose of this experimental feature was to test the effectiveness of an insulated conventional embankment with reduced Air Convection Embankment (ACE) shoulder top-widths with varying top widths over a section of the Dalton Highway being realigned at MP 219 over thaw-unstable ice-rich permafrost in the foundation soils. This experimental featu
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Hot dipped galvanized steel rebar (HDGR) is an alternative to plain carbon steel often considered for concrete reinforcement. The zinc rich layer serves as a sacrificial coating protecting the underlying carbon steel. While there is information reporting benefits from increased chloride threshold and reduced corrosion rates, there is also uncertain
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This project sought to develop a coordinated and consistent multi-state approach to the setting of policies, laws, and regulations within the New England region to support the seamless operation of ADS-equipped vehicles across the New England states.
Phased construction is a common technique utilized to allow bridges to remain partially open to traffic throughout the construction process. The segment of the bridge deck that is constructed second cures under the effect of traffic-induced vibration transmitted from the adjacent bridge-deck segment, which is open to traffic. However, subjecting br
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Applying flood coats (thin epoxy overlays and healer sealers) improves bridge deck condition and extends service life. The current Michigan Department of Transportation (MDOT) policy is to maintain a total curing period comprising 28 days of wet and dry curing before applying a flood coat on bridge decks with new concrete for patches and repairs. C
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The objective of this project is to assist Colorado Department of Transportation (CDOT) in the identification of regionally sourced agricultural co- or by-product deicer additives that will enhance corrosion protection and provide added deicing performance and longevity to road surfaces. A literature review provides a summary of agriculturally deri
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Burro-vehicle collisions (BVCs) have the potential to cause motorist fatalities, injuries, and property damage. The Lake Pleasant area north of Phoenix, Arizona, has reported high BVC rates on highways within and around the Lake Pleasant Herd Management Area (LPHMA). Although interactions between wildlife and highways and specifications for wildlif
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Kentucky’s 14,000+ bridges are key nodes within the state’s surface transportation network. They facilitate the movement of freight, commercial vehicles, and personal vehicles alike. Historically, the Kentucky Transportation Cabinet (KYTC) has prioritized bridge maintenance projects using sufficiency ratings. These ratings are based on three factor
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Risk management is integral to highway project development. Managing risk entails identifying uncertainties which could influence project activities, understanding how they can be mitigated or eliminated, and monitoring risk during project development. Many state transportation agencies have introduced methods for identifying risks, determining whe
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