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 research sought to evaluate the broad impacts that automated and connected vehicle technologies can have on both the motor carrier and rail industries. Since the development and adoption of these technologies are likely to be gradual, three phases were posited and analyzed. Depending on the degree of autonomy that is available, the motor carri
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Infrastructure risk due to fire has been well documented. In particular, bridges in the urban environment are susceptible due to low overhead clearances on overpasses, existing simple spans with no redundancy, due to low overhead clearances on overpasses, existing simple spans with no redundancy, narrow lane widths and general alignment congestion.
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Delamination or debonding between asphalt layers is a persistent problem often encountered when analyzing pavement cores taken from Missouri’s roadways. Delaminated asphalt layers are suspected to be the primary cause of premature pavement deterioration that dramatically decreases the pavement’s service life. After a thorough review, the Missouri D
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According to the National Complete Streets Coalition: "A Complete Streets approach integrates people and place in the planning, design, construction, operation, and maintenance of our transportation networks. This helps to ensure streets are safe for people of all ages and abilities, balance the needs of different modes, and support local land uses
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This project implemented additional features into MnPAVE-Rigid, leading to a new version of MnDOT’s rigid pavement design software. The database of American Association of State Highway Transportation Officers (AASHTO) mechanistic-empirical (M-E) pavement design projects was expanded to account for additional design inputs. A new codebase using the
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This research presents an extensive study on the design and characterization of asphalt mixtures used in road pavements. Both mixture volumetrics and physical properties obtained from several laboratory tests were considered in optimizing the mixture design. The research was divided into two phases. Phase 1 included the design and detailed analysis
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This report presents the results of a study of the statistical significance of continuous lighting and/or clearing and grubbing of roadway corridors as measures taken to reduce moose-vehicle collisions. Individual analyses and a combined regression analysis were conducted to investigate moose-vehicle collision rates, given several combinations of v
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Traffic congestion is a major challenge for high-density and high-growth areas—wasting fuel, increasing vehicle emissions, and delaying the movement of passengers and freight. The problem is compounded by the gap between the cost of needed transportation projects and existing funding sources and levels that are remaining static at best. The concept
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Numerous agencies use Open Graded Friction Course (OGFC) mixtures as the final riding surface on their roadways because of the many benefits such as: reduced hydroplaning, reduced splash and spray, reduced headlight glare, improved visibility, reduced accidents, reduced noise, and surface friction properties. However, there have been some indicatio
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Since 2012, MDOT has been modernizing its highway design processes by using 3-D modeling in road construction. In this study, researchers developed plans for leveraging the benefits of 3-D and 4-D modeling in bridge design projects. This technology will allow designers to visualize bridge designs at all stages, from planning through construction. A
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Many bridges are exposed to snow and ice during the winter. As snow and ice accumulate over the bridge’s concrete deck, deicing salts are usually spread on the bridge deck to remove and dissolve the snow and ice. Deicing salts form a chloride solution that penetrate through the concrete and cause corrosion in reinforcing steel and deterioration in
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Dowel bars are the current preferred method for providing load transfer for jointed plain concrete pavements (JPCP). For proper load transfer to occur, the dowels must be placed properly, i.e., in the middle of the slab, horizontal to the grade, and in the direction of traffic flow. This project evaluated JPCP performance with relation to dowel bar
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The current TDOT MS4 permit requires TDOT to identify and catalog all post-construction Stormwater Control Measures (SCMs) in the Right of Way (ROW). However, it's not clear what highway drainage structures and vegetated landscaping (e.g. swales) really constitute a beneficial SCM and which are simply a stormwater conveyance. Most swales/ditches we
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Since 1983, TDOT has absorbed approximately 3,500 miles of former county roads into its system. The composition and structural capacity of a large portion of these road ways is unknown, except for new overlays that have been constructed since that time. The objective of this study is to utilize ground penetrating radar (GPR)technology to determine
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Many rural towns and cities throughout Nebraska have experienced consistent population decline over the past 50 years, and the highway system once built to accommodate hoped-for growth is not serving the population as well as it could. These towns and cities would benefit from implementing a road diet conversion on their main highways. Since suppor
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On May 23, 2018, C2SMART at the New York University Tandon School of Engineering and two of its collaborating partners, the Infrastructure Monitoring and Evaluation (RIME) Group at Rutgers University and the International Center for Enterprise Preparedness (INTERCEP), also at NYU, held a meeting to establish a dialogue with multiple stakeholders to
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This technical assistance report investigated the existing state of practice across the nation for placing safety campaign messages on dynamic message signs (DMS) and reviewed relevant studies that documented any evidence of effectiveness in influencing driver behavior and providing a public safety benefit. The number of state transportation agenci
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Recent federal legislation and the Federal Highway Administration (FHWA) have directed state transportation agencies to identify potential vulnerabilities associated with extreme weather events and climate change, develop a risk-based asset management plan, and incorporate findings into transportation planning, design, and maintenance practices. Th
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Reflective cracking in asphalt overlays placed over jointed concrete pavement has been a concern of the Virginia Department of Transportation (VDOT) for years. Although there are many techniques to delay crack propagation through an asphalt overlay, they may require specialized equipment, unique mix designs, or other specific mixture additives. The
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This research provides a synthesis of the state-of-the-art practices in quality management for highway construction projects delivered by the alternative delivery methods, especially design–build. A design–build project delivery system is a significant change from the traditional design–bid–build system. A large number of roles and responsibilities
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