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 guideline describes procedures for selecting and obtaining representative samples and the laboratory mix design procedures for cold in-place recycling (CIR) using the indirect tensile strength (IDT) test.
Ground-penetrating radar (GPR) technology has been widely applied in ground subsurface investigations. The major development of GPR for pavement assessment originated in the early 1980s and since has become a well- established investigation technique for pavements. Analysis of GPR data provides much richer information on layer depths of pavement st
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Freight is fundamental to economic growth, however, the trucks that haul this freight are pollution intensive, emitting criteria pollutants and greenhouse gases at high rates. The increasing volume and time-sensitivity of freight demand over the past decade has encouraged carriers to take the fastest route, which is often not an eco-friendly route.
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The National Bridge Inventory bridge inspection system ranks the condition of bridge components on a scale of zero to nine. The resulting condition ratings represent an important element considered in deciding measures for bridge maintenance, repair, and rehabilitation. Thus, forecasting future condition ratings well is critical to reliable plannin
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Rural low-volume roads (LVRs) are an integral part of the highway system as they provide connectivity to rural areas. Low traffic volumes and the random and sporadic nature of crash occurrence over LVR networks pose challenges in using the conventional crash-based network screening methods. Therefore, the objective of this research project is to de
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Texas Department of Transportation (TxDOT) encounters a considerable and yet increasing number of claims and change orders every year that negatively affects project costs and schedules. Insufficient and inaccurate information about the subsurface condition is a critical factor contributing to these cost overruns and delays. The annual cost of chan
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Carnegie Mellon’s Remaking Cities Institute (RCI), supported by a challenge grant from CMU’s Traffic21 and the Mobility21 Urban Transportation Center, worked with communities in Allegheny County to address local mobility challenges and opportunities, specifically the role of new mobility options in addressing the challenges for residents with no or
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High-volume fly ash concrete (HVFAC) has improved durability and sustainability properties at a lower cost than conventional concrete, but its early-age properties like strength gain, setting time, and air entrainment can present challenges for application to concrete pavements. This research report helps with the implementation of HVFAC for paveme
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High Friction Surface Treatments (HFST) applications are used to reduce roadway crashes on risky locations and horizontal curves. Currently, Calcined Bauxite (CB) is the primary aggregate used for HFST in Missouri. Calcined Bauxite has very limited sources, which makes it more expensive than locally available aggregates. This research evaluated CB'
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The Covid-19 pandemic dramatically curtailed travel in the spring of 2020 and more moderately in the months that followed. Travel on public transport declined more and remains lower than on other travel modes, such as driving, biking, and walking. Although public transit operators have implemented various measures to reduce the risk of infection fo
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This project developed several models to obtain accurate estimates of annual average daily traffic (AADT) at non-coverage locations. The developed models include kriging, regression and point-based. The standard kriging approach is modified in this project to use a default value when its predicted value is over a user-specified threshold (referred
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This project expanded on the technology readiness of three non-destructive tools for potentially enhancing quality inspection, asset management, or forensic investigations in flexible pavements. These tools included mechanics-based models for base course, compaction monitoring system (CMS) for asphalt mixture process control, and ground penetrating
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The Missouri Department of Transportation (MoDOT) Maintenance Division uses different materials to reduce the negative impact of snow and ice on the friction performance of state travelways. These materials include abrasives (sand or cinders), rock salt (sodium chloride), and other chemical deicers that emerged in recent years. The use of chemicals
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A 2019 Department of Homeland Security report assessing the regional resiliency of Western Washington state to a Cascadia Subduction Zone earthquake predicted widespread and high levels of bridge damage. Because of this report, the state’s emergency response and recovery plan is heavily reliant on air transportation modes to provide resources to th
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Connected and autonomous vehicle (CAV) technologies provide solutions to the existing problems of the transportation systems. As widely known, CAVs can communicate with each other so that they can have coordinated accelerating or decelerating movements. In this manner, CAVs only need a smaller headway which will lead to a higher roadway capacity. F
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The overall objective of this project is to document highway runoff and constituent concentrations discharged from common highway-drainage conveyance structures in Connecticut from nine highway sites during two sequential two-year periods in order to fulfill Connecticut Department of Transportation's (CTDOT’s) Municipal Separate Storm Sewer Systems
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