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.
Federal legislation requires state departments of transportation to consider and apply inflation to the costs of transportation projects. However, there is no guidance on how inflation should be calculated. Previous research on this topic primarily focused on developing construction cost indexes. Previous methods of prediction included neural netwo
...
A 100-ft field implementation of the proposed solar snow fence was conducted In Glyndon, MN. The implementation process started with the manufacturing of solar stripe frames, U connection with steel posts, helical piling, electrical power harvest and storage, electrical use in snow melting, and monitoring of the solar snow fence systems. A 12-ft la
...
Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr
...
This guide was developed to help Minnesota local agencies better understand and compare Capital Improvement Planning (CIP) software tools. The guide summarizes key features, functionalities, and support offerings across several CIP-related solutions, based on vendor-provided information and publicly available materials. The Technical Advisory Panel
...
Currently, many paving agencies in the U.S. including the Missouri Department of Transportation (MoDOT) use the AASHTO T283 method (Tensile Strength Ratio (TSR) test) to determine the moisture damage susceptibility of asphalt mixtures. However, the TSR test has been shown to have a poor correlation with field results based on a review of literature
...
Currently, many paving agencies in the U.S. including the Missouri Department of Transportation (MoDOT) use the AASHTO T283 method (Tensile Strength Ratio (TSR) test) to determine the moisture damage susceptibility of asphalt mixtures. However, the TSR test has been shown to have a poor correlation with field results based on a review of literature
...
The rapid deployment of automated vehicles presents both opportunities and challenges, especially for first responders tasked with ensuring public safety during emergencies. This research project, led by the Texas A&M Transportation Institute, in partnership with the Texas A&M Engineering Extension, addressed critical needs and strategies for inter
...
Heavy-duty electric vehicles (HDEV) pose challenges to flexible pavements. This study evaluated four Illinois pavement structures to quantify HDEV impacts on pavements. Compounding factors included increases in load and acceleration, which escalated critical strains and reduced repetitions to failure. Various distresses were considered: bottom-up c
...
Texas Department of Transportation (TxDOT) Project 0-7037 was initiated to develop a model/tool that could help TxDOT and other transportation planners estimate and assess impacts of changes in freight traffic flow on the Texas Highway Freight Network more quickly than by conducting a full Statewide Analysis Model run. The goal was to produce a too
...
This report synthesizes speed safety camera elements, issues, best practices, and evidence-based results identified from a national and international review of jurisdictions employing speed safety cameras. Using these findings, this report provides recommendations to ODOT on changes and additions to the statewide speed safety camera program, as wel
...
The primary objective was to summarize best management practices that avoid and minimize impacts on aquatic resources through construction design standards. The study involved a literature review and discussions with experts to identify knowledge gaps regarding the effects of road and bridge construction on aquatic resources. We examined how other
...
This study focused on understanding the impact of transverse cracks on the residual capacity and load rating analysis of in-service precast prestressed concrete (PPC) deck beams. Two decommissioned (33 × 36 and 21 × 36) PPC deck beams were tested under four-point bending loads to assess the impact of transverse cracks on the structural performance
...
Conveyance channels are commonly used on highway construction projects to manage the flow of water through the project to downstream discharge points or stormwater detention practices. However, these channels can be at risk of erosion before stabilization due to high-velocity flows. A common erosion control practice in channels is a rock check dam,
...
UDOT faces significant challenges in manually inspecting roadside safety assets across its extensive roadway network, prompting the need for automated condition assessment solutions. This project leverages street-level image data to develop an AI-driven framework for assessing primary assets (guardrails, cable barriers, concrete barriers) and secon
...
The purpose of this report is to present the measured properties and comparison between concrete mixtures consisting of different available supplementary cementitious materials (SCMs) for the purpose of understanding which SCM provides the best chloride resistance for bridge decks in Utah. The concrete batches were created in the Utah Valley Univer
...
This study evaluates medium-duty vehicle operations and safety in Oregon to understand impact of e-commerce growth and logistics changes. The objectives were to analyze trends, assess safety risks, and provide policy recommendations. Data from the Oregon Department of Transportation (ODOT) Crash Data System, the Commercial Motor Vehicle crash datab
...
FHWA has recently released the new MUTCD, which includes requirements for maintaining minimum levels of retroreflectivity for pavement marking. Such regulatory compliance poses a challenge to agencies because conventional visual inspection methods are labor-intensive, and the results can be subjective. MassDOT has recently completed Phase 1 of this
...
The New England Transportation Consortium (NETC) is a research cooperative among the six New England transportation agencies: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Since its inception in 1990, NETC has been a Federal Highway Administration (FHWA) pooled fund supported by federal State Transportation and Researc
...
Outdoor advertising signs impact millions of travelers around the world every day. These signs are designed to attract driver attention, thus taking it away from the driving task. Driver inattention and distraction are two critical factors for road safety. Regulation of outdoor advertising signs must deal with changing technologies, including digit
...
Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve
...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.