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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.

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Showing 2181 - 2200 of 36114 results
  • Evaluation of Coefficient Related to Runoff from Roadway Projects
    Evaluation of Coefficient Related to Runoff from Roadway Projects
    Guo, Qizhong (George) ;
    Miskewitz, Robert
    2023-03-01 | PDF
    New Jersey Department of Transportation (NJDOT) is required to quantify and mitigate the stormwater impacts of certain roadway projects. Acceptable runoff calculation methods include the Natural Resources Conservation Service Method and the Rational Method. Existing coefficients are often insufficient for representing land treatments utilized in ro ...
  • MultiCity Study of an Engineering and Outreach Program to Increase Driver Yielding at Signalized and Unsignalized Crosswalks
    Multi-City Study of an Engineering and Outreach Program to Increase Driver Yielding at Signalized and Unsignalized Crosswalks
    Morris, N L ;
    Craig, C M
    2023-03-01 | PDF
    Pedestrian deaths are at a 30-year high nationally, accounting for 16% of total deaths in 2018 and far exceeding the previous decade of 12%, a trend mirrored in Minnesota. Previous research found an increase in local and citywide yielding at unsignalized crosswalks following an engineering and high-visibility enforcement program in Saint Paul, Minn ...
  • District Highway Maintenance Research OnCall ROC 202309 Task 1 Evaluation of New Methods for Improving Crack Sealing Process Fact Sheet
    District Highway Maintenance Research On-Call (ROC) 2023–09. Task 1, Evaluation of New Methods for Improving Crack Sealing Process [Fact Sheet]
    Nazzal, Munir D
    2023-03-01 | PDF
    Although crack sealing is one of the common tasks that maintenance crews at ODOT county garages frequently conduct, it can often be challenging as it is weather-dependent, slow-paced, and labor intensive. In addition, frequent breakdowns of equipment can cause significant downtimes. Crack sealing maintenance crews are also exposed to many hazards i ...
  • The 2021 National Survey of the Use of Booster Seats
    The 2021 National Survey of the Use of Booster Seats
    Boyle, Lacey L
    2023-03-01 | PDF
    This technical report presents results from the 2021 National Survey of the Use of Booster Seats (NSUBS), the only probability-based nationwide child restraint use survey in the United States that observes restraint use and interviews an adult occupant to collect age, gender, height, weight, race, ethnicity, and other data. NHTSA’s National Center ...
  • Engineered Log Jam Monitoring Along NH Route 16 in Errol New Hampshire
    Engineered Log Jam Monitoring Along NH Route 16 in Errol, New Hampshire
    Ballestero, Thomas P. ;
    Ballestero, Joel C
    2023-03-01 | PDF
    Many roads and highways exist close to streams that exhibit lateral instability (bank erosion). Conventional practices are to armor such locations, and these solutions are expensive, do not provide ecosystem value, and result in high mitigation fees. Natural channel design structures, such as engineered log jams, offer a greener, less expensive alt ...
  • Design and Evaluation of Transition for TxDOT MASH Test Level 4 TL4 Guardrail System
    Design and Evaluation of Transition for TxDOT MASH Test Level 4 (TL-4) Guardrail System
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2023-03-01 | PDF
    Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) compliant guardrail transition system (hereafter referred to as Transition) that enables transitioning and terminating the ends of the Texas Department of Transportation MASH TL-4 guardrail system with MA ...
  • Parametric Analysis of Telecommuting Effects on Transportation Tax Revenues
    Parametric Analysis of Telecommuting Effects on Transportation Tax Revenues
    Shokouhian, Mehdi ;
    Schonfeld, Paul
    2023-02-28 | PDF
    This study explores the effects of increases in online activities (such as telecommuting and online shopping) as well as shifts toward electric vehicles on transportation revenues for the District of Columbia (DC). The analysis is based on (1) a review of the literature and state of practice regarding online activities, trends in vehicle fleet mix, ...
  • Postfire Damage Inspection of Concrete Structures Phase II
    Post-fire Damage Inspection of Concrete Structures – Phase II
    Viglas, James ;
    Vitalis, Thomas
    2023-02-28 | PDF
    In general, tunnels are designed with an abundance of safety regarding structural integrity, however, there can be uncertainty related to structural performance after a fire event. The residual condition of a tunnel after a fire is dependent on fire intensity and duration. The goal of this study is to correlate visual and material characteristics o ...
  • OffSystem Public Roads Annual Average Daily Traffic AADT Estimation Study
    Off-System Public Roads Annual Average Daily Traffic (AADT) Estimation Study
    Hylton, Peter ;
    Miller, Bryce C
    2023-02-28 | PDF
    This report describes a process to estimate AADT on non-Federal-Aid public roads (collectively called “off-system” roads) in Idaho. This will provide additional data for ITD and regional and local transportation agencies to conduct analysis, and it will meet new federal requirements for estimating AADT on all public roads. The report includes a rev ...
  • Testing and Analysis of the Effects of Contamination of Friction Pendulum Bearings
    Testing and Analysis of the Effects of Contamination of Friction Pendulum Bearings
    Alvarado, Rolando Grijalva ;
    Ryan, Keri L.
    2023-02-17 | PDF
    Field contamination of friction pendulum system (FPS) isolation bearings (water, ice, dirt and other debris) has been observed in several Alaskan bridges during routine bridge inspections. Characterization testing was performed on four FPS bearings in clean/dry conditions as well as wet, frozen and soil-filled. Three of the four were double pendulu ...
  • Testing and Analysis of the Effects of Infiltrated Water and Ice on Friction Pendulum Bearings
    Testing and Analysis of the Effects of Infiltrated Water and Ice on Friction Pendulum Bearings
    Alvarado, Rolando Grijalva ;
    Ryan, Keri L.
    2023-02-17 | PDF
    Field contamination of friction pendulum system (FPS) isolation bearings (water, ice, dirt and other debris) has been observed in several Alaskan bridges during routine bridge inspections. Characterization testing was performed on four FPS bearings in clean/dry conditions as well as wet, frozen and soil-filled. Three of the four were double pendulu ...
  • Options for the Future of State Funding for Transit Operations in California Informing the Future of the Transportation Development Act
    Options for the Future of State Funding for Transit Operations in California [Informing the Future of the Transportation Development Act]
    Gahbauer, John ;
    Matute, Juan
    2023-02-15 | PDF
    What transit will look like in the future depends on how it is funded now. Funding can lead planning (Taylor, 2000), especially in setting the agenda for agencies to follow. How transit is funded, therefore, is at least as important as the level at which transit is funded. This brief focuses on the Transportation Development Act (TDA) because of it ...
  • Enhancing the Strategic Prioritization Process with Socioeconomic Geospatial Analysis
    Enhancing the Strategic Prioritization Process with Socioeconomic Geospatial Analysis
    Davis, Joy ;
    Coupet, Jason
    2023-02-15 | PDF
    This project is designed to provide the North Carolina Department of Transportation (NCDOT) with implementation-ready tools for incorporating data-driven socioeconomic measures into the Strategic Transportation Investments (STI) prioritization process for pedestrian, bicycle, and transit projects. This research will equip NCDOT with the tools neede ...
  • Shrinkage and Temperature Forces in Frame Piers Summary
    Shrinkage and Temperature Forces in Frame Piers [Summary]
    Shafei, Behrouz
    ORCID ICON IMG
    2023-02-01 | PDF
    Appropriate design strategies for frame piers can ensure their satisfactory performance against shrinkage and temperature effects while maintaining their construction cost advantages.
  • The Potential for RideMatching in Disadvantaged Communities
    The Potential for Ride-Matching in Disadvantaged Communities
    Giuliano, Genevieve ;
    Boarnet, Marlon
    2023-02-01 | PDF
    The mobility constraints for low-income households are well known. Limited or no access to a private vehicle and often poor quality transit access result in shorter trips, slower travel speeds, and overall less travel. New mobility services that fill the gap between vehicle ownership and transit can potentially provide better mobility options for t ...
  • Developing a Culvert Inspection Manual and Estimating Culverts Deterioration Curve Inspection Frequency and Service Life for UDOT
    Developing a Culvert Inspection Manual and Estimating Culverts’ Deterioration Curve, Inspection Frequency and Service Life for UDOT
    Mohammadi, Pouria ;
    Sherafat, Behnam
    2023-02-01 | PDF
    Culverts are among the most important assets of state transportation departments. As culvert inspection and maintenance are critical to the safe operation of transportation infrastructure systems and preventing injuries, human life losses, and heavy financial losses, they should be inspected and maintained regularly. Several state DOTs and the Amer ...
  • Shrinkage and Temperature Forces in Frame Piers
    Shrinkage and Temperature Forces in Frame Piers
    Shafei, Behrouz ;
    Nelson, Al
    2023-02-01 | PDF
    Shrinkage and temperature forces are known to have short- and long-term effects on both the superstructures and substructures of bridges. In the substructure, such effects are more pronounced if frame piers are used, given their volumetric change is often restrained. The main objective of this research was to investigate the forces developed in fra ...
  • Improved Incident Response through Coordinated Interoperable Communications Project Capsule
    Improved Incident Response through Coordinated, Interoperable Communications [Project Capsule]
    Moomen, Milhan
    ORCID ICON IMG
    2023-02-01 | PDF
    The objectives of this study are to: (1) carry out an operational needs assessment and a performance evaluation of the state’s TIM; (2) perform a functional analysis of the Mutualink system; and (3) carry out a benefit cost analysis of integrating Mutualink into the state’s TMC.
  • Minimum Intersection Illumination Tech Summary
    Minimum Intersection Illumination [Tech Summary]
    Hassan, Hany
    ORCID ICON IMG
    2023-02-01 | PDF
    The primary objective of this project is to examine whether Louisiana has a traffic safety problem due to lack of lighting at its intersections, particularly at roundabouts and stop-controlled intersections, at rural and suburban areas. Underlying this objective, this research aims to undertake a nationwide survey of state DOTs to document lessons ...
  • Asphalt RealTime Smoothness ARTS for Asphalt Paving
    Asphalt Real-Time Smoothness (ARTS) for Asphalt Paving
    Chang, George K ;
    Merritt, Dave
    2023-02-01 | PDF
    Real-Time Smoothness (RTS) measures pavement surface profiles during paving using sensors mounted on the back of a paver. The Federal Highway Administration (FHWA) has supported implementing RTS technology for concrete pavements through the SHRP2 Solutions program since 2014. Its study indicated that RTS technology's real-time diagnosis allows chan ...
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