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.
Stormwater conveyance networks contribute to stream degradation and instability either through direct discharges of sediment or by eroding gullies downslope of pipe outlets. To limit erosion downslope of pipe outlets, current regulations require the 10-yr, 24-hr peak velocity discharged to a vegetated area to be less than the downslope soils’ permi
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Increasing the usage of sustainable travel modes requires changes in both environmental and psychological dimensions. A knowledge gap exists concerning the mechanism via which various factors interact to shape travel decision. Gaining such knowledge requires our ability to examine people’s behavioral adjustment in reaction to environmental and psyc
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The ODOT Office of Hydraulic Engineering initiated this research project to investigate the reasons for incomplete filling of the annulus voids and to develop a solution to address the problem.
Reclaimed Asphalt Pavement (RAP) has been extensively studied for potential use as a recycled material in infrastructure construction. There is consensus that utilization of RAP provides environmental and economic benefits for most projects. However, impacts to engineering performance are less known, due to the highly variable nature of RAP sources
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HB 21-1303, the “Buy Clean Colorado Act” requires contractors to submit EPDs for asphalt and asphalt mixtures, cement and concrete mixtures, and steel installed on CDOT projects. Ultimately, the bill instructs CDOT to establish greenhouse gas (GHG) emission limits for these materials, and contractors on CDOT construction projects will need to compl
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The purpose of this reference guide is to provide local agency staff a resource on four intelligent warning devices (active warning signs) that includes a general explanation on the use of the sign and their effectiveness, recommended installation protocols, alternative countermeasures to consider and maintenance considerations. With this guide, ag
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This Tool serves as a guide to assist agencies in understanding their options and determining which pavement marking material may be considered for a new surface or when replacing existing markings with a different material. That said, no one size fits all. Engineers should use their engineering judgment and seek expert advice when necessary.
There are three commonly used culvert types in Minnesota: concrete, corrugated steel pipe (CSP) and plastic. The latter is relatively newer. Therefore, Minnesota local agencies requested more insight on how to select a culvert type. A literature search was conducted, and although there are several technical resources, most of them focused on design
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The primary objective of this study was to assess the challenges and opportunities associated with the provision of appropriate infrastructure to support electric vehicle (EV) operations and electrification across Indiana. A secondary objective of this study was to develop a strategic plan for the Indiana Department of Transportation (INDOT) that 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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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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Concrete overlays have proven to be an effective maintenance treatment as they slow de-icing chemical and water penetration into the original deck surface. Typically, due to vibration, structural flexibility, and a weak bond between the concrete overlay and deck concrete (potentially because of poor construction), de-bonding develops at the boundar
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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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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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The New Jersey Department of Transportation (NJDOT) researched the predictive safety analysis tools available in the market and how they are being used by State Departments of Transportation (DOT). These tools have proliferated since the American Association of State Highway and Transportation Officials (AASHTO) released the Highway Safety Manual (
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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 goal of the predictive safety tool research is to help New Jersey meet its safety targets and reduce transportation fatalities and serious injuries on all public roads, including non-State-owned roads. The use of predictive safety tools can help reach that goal by expanding the data and capability of the NJDOT to conduct safety analyses that pr
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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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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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