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.
The road history projects undertaken by the Virginia Transportation Research Council establish the feasibility of studies of early road networks and their use in the environmental review process. These projects, by gathering and publishing the early road orders of the vast parent counties and other significant areas, also lay the foundation for add
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This study calibrated the predictive models for conventional intersections in the Highway Safety Manual (HSM) second edition draft to account for local conditions in Virginia. The calibration ensures that predictions made with the HSM safety performance functions accurately reflect the crash experience, driver population, and environmental characte
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“Major transit stop”: how these three words are defined determines what can be built where, throughout much of California. In order to address housing supply constraints, the state legislature has enacted a number of laws that streamline approval and remove zoning constraints in areas close to high-quality transit. But what, exactly, is a “major tr
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A novel Hardware-in-the-loop Simulation tool was constructed to show how modifications to signal timings would improve coordinated corridor performance. A total of 15 unique microsimulation models were developed and run three times each to test three case studies of bi-direction bandwidth optimization, cycle length sensitivity, and leading pedestri
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The research goal of this project is to better understand the potential implications of a household e-commerce delivery fee. A survey was developed to study the factors that impact potential revenue and its equity implications.
Montana’s timber bridge inventory includes over 600 state and county owned bridges, many more than 80 years old and showing visible deterioration. Traditional girder repair methods, such as steel hangers and timber or steel sister girders, are heavy, labor-intensive, and often lack well-documented performance verification. Fiber-reinforced polymer
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This study evaluated how Missouri’s annual letting calendar could be structured to improve competition and lower award costs while remaining feasible under existing policies and delivery practices. Historical bid outcomes were used to estimate monthly “performance curves” that related workload share to observed price behavior. A genetic algorithm t
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Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T
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Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T
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The project aimed to evaluate the impact of four strategies designed to improve the durability of FC-5 mixtures: employing a 9.5-mm nominal maximum aggregate size (NMAS) gradation; using a high polymer (HP) modified binder in the mixture; assessing the effectiveness of a 12.5-mm stone matrix asphalt (SMA); and exploring an alternative friction cour
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The main objective of this research was to identify and quantify the factors that influence resistivity measurements in concrete samples, comparing field- and laboratory-fabricated specimens (per AASHTO T 358 and AASHTO TP 119).
The research aimed to evaluate how screw anchors actually perform in real FDOT conditions, understand why the current ACI design approach is conservative, and develop improved FDOT design guidelines that safely allow screw anchors to be used more widely, without unnecessary restrictions.
This study evaluated how Missouri’s annual letting calendar could be structured to improve competition and lower award costs while remaining feasible under existing policies and delivery practices. Historical bid outcomes were used to estimate monthly “performance curves” that related workload share to observed price behavior. A genetic algorithm t
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The project aimed to develop data sources, standards, and actionable guidance that FDOT can use to strengthen arterial TSM&O implementation statewide. This included reviewing the literature, evaluating existing software tools, identifying best practices from other departments of transportation, and creating recommendations tailored to Florida’s dis
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The primary objective of the research was to help FDOT successfully implement and optimize the AASHTOWare BrM software by recalibrating its essential analytical models—such as deterioration, risk, cost, and data translation tools—so the software can more accurately forecast bridge performance, support decision-making, and satisfy federal requiremen
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The objective of the research was to identify what further research is needed to use larger FRP bars in waterline pile cap footings, develop material acceptance criteria and design specifications for No. 11 glass FRP bars, and create design examples to help implement these bars in practice. Additionally, the study provided recommendations for futur
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The objective of this project was to determine appropriate screening thresholds for tests that assess concrete durability in extremely aggressive chloride and sulfate environments. Specifically, the research aimed to recommend threshold values for bulk and surface resistivity tests (based on AASHTO TP 119 and T 358) for chloride durability, and for
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Successful transportation safety messages are only effective if travelers can comprehend the notices. However, one method of safety messaging, text-only messages, can be challenging for non-native English speakers and slow-reading populations, such as older adults. The addition of graphics can potentially improve message comprehension, but their ef
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The primary objective of this study was to investigate the feasibility of using lignin, an environmentally friendly biopolymer, for sustainable protection of Kansas roadsides against wind and rainfall erosion during the critical stage of construction that occurs prior to the emergence of a vegetative cover. Results from laboratory-scale experiments
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This study delivers a Michigan-specific mechanistic-empirical framework for rehabilitation pavement design by locally calibrating PMED V2.6 across all major MDOT rehabilitation fixes, including asphalt over asphalt/concrete/rubblized concrete/crushed asphalt, and concrete over asphalt/concrete. Using 14 field projects, FWD, GPR, LWD, and field core
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