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.
Understanding the travel behavior of pedestrians and cyclists on Louisiana’s roadways is critical to evaluating safety outcomes relative to rates of exposure; identifying appropriate, context-sensitive complete streets infrastructure interventions; and understanding overall statewide and location specific transportation trends. Better understanding
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This project is a multi-disciplinary investigation into the use of alternative media for biofiltration systems in Minnesota. Over the last thirty years, the Minnesota Department of Transportation (MnDOT) has implemented biofilters along roadways as a stormwater control measure. These systems must be able to infiltrate and treat the first inch of ra
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The Strategic Highway Investment Formula for Tomorrow (SHIFT) program research team evaluated the program’s 2018 safety component and developed a new methodology to rank the safety needs of 2020 projects. For the current year, the research team suggests replacing the SHIFT 2018 formulas (based on three naive crash measures) with a new metric, Exces
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This project designs a conceptual framework to harness and mature wireless technology to improve transportation safety, with a focus on frontal collision warning/collision avoidance (CW/CA) systems. The framework identifies components of the technology and its capabilities, and how these components can be integrated to improve transportation safety
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Using recycled asphalt pavements (RAP) and recycled asphalt shingles (RAS) blended with virgin binder for new road pavements is an environmentally friendly way to recycle the used asphalt. In this project, researchers studied a correlation between the molecular structure of asphalt binders of conventional hot mix asphalt mixtures (HMA) containing r
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Iron-enhanced ditch checks in roadside swales were developed specifically for capturing dissolved phosphorus and dissolved metals from roadway runoff in both urban and agricultural environments. One iron-enhanced ditch check constructed along CR 15 (formerly TH 5) in Stillwater, Minnesota, was monitored during 40 storm events from 2016 to 2018. The
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This project developed a performance-based specification for automated distress data collections systems based on analysis of data provided by the Texas Department of Transportation (TxDOT), analysis of data collected under this research study, and discussions with three experienced providers of distress data collection. The research team also assi
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The final product of this research is an enhanced Mobile Application platform that receives travel time information, parking information and transit/shuttle schedule information in real time for the Routes 1 (from I-295 to Garden State Parkway) and 18 (from New Jersey Turnpike to Rutgers University – Piscataway, NJ) corridors, specific to certain d
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Kentucky’s inventory of historic steel truss bridges is declining rapidly. There are more than 150 historic truss bridges in the Kentucky Transportation Cabinet’s (KYTC) bridge inventory. Most of these bridges require maintenance to avoid replacement. However, prioritizing the rehabilitation of these bridges based on their historic importance is ch
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This technical report examined the Strategic Highway Safety Plan (SHSP) and Highway Safety Plan (HSP) documents of Louisiana to conduct a crosswalk analysis and determine where highway safety strategies in both plans overlap, co-exist, duplicate, or intersect. Targets, approaches, and strategies between the two planning documents were comparatively
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Long-span bridges support a large amount of traffic every day. Even when an earthquake strikes, a long-span bridge often still has many vehicles present due to the low predictability of earthquake events. To study the seismic performance of bridge and traffic systems, a new full-response prediction methodology for the coupled bridge-traffic interac
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Accurate estimation of pre-stress losses is one of the important issues for the design of precast, pre-stressed concrete bridge girders. While this subject has been long studied by many researchers, studies on pre-stress losses in cold climates are minimal. In the present research, long-term pre-stress loss due to concrete creep was studied based o
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Inadequate grouting is associated with corrosion of post-tensioning steel in grouted tendons used in construction applications. A nondestructive method capable of revealing grout deficiencies of external tendons was developed under concurrent Florida Department of Transportation (FDOT) Project BDV25-977-24. The method uses impedance and magnetic me
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Pedestrian fatalities and injuries represent a growing percentage of all traffic fatalities and injuries. This project used a multifaceted approach to improving compliance to the Minnesota crosswalk law in Saint Paul, Minnesota, including: (1) education, (2) measurement, (3) enforcement efforts, (4) social norming, and (5) engineering treatment. Th
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The National Center for Asphalt Technology (NCAT) Test Track is a pavement proving ground that was originally constructed from 1998-2000. This 1.7-mile oval track is a unique accelerated pavement testing facility that utilizes full-scale pavement construction of test sections and highway-speed, heavy trafficking to provide analysis of asphalt pavem
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The Institute for Trade and Transportation Studies (ITTS) serves as a regional organization of state departments of transportation in the Southeast. The ITTS provides research data and expert opinions to its members concerning the effects of commercial freight movements on domestic and international activities, with reference to infrastructure and
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Welded steel girder bridges can contain details that can high welding and service stresses and are termed constraint-induced fractures (CIF). The Kentucky Transportation Cabinet has steel bridges with weld details known to cause CIFs whose girders have experienced fracture events. The Cabinet’s bridge inventory was reviewed and additional candidate
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This project, Phase 2 Slope Vulnerability Assessments, is a continuation of the Phase 1 project previously conducted by WSB and MnDOT to determine the risk of slope failure along state highways. The Phase 2 study area includes 32 counties located in districts 4, 6, 7, 8, and Metro. This reports outlines the methods and results of this project inclu
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Child pedestrians are some of the most vulnerable users of our transportation systems, and they deserve particular attention when we consider traffic safety. Part 1 of this report identifies locations in urban areas where child pedestrians are at particular risk for fatal collisions with vehicles. We do so by examining 30 years of crash data for si
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