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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 161 - 180 of 36841 results
  • Seismic Avalanche Detection for the Turnagain Arm Transportation Corridor
    Seismic Avalanche Detection for the Turnagain Arm Transportation Corridor
    Lynch, Richard
    2026-05-01 | PDF
    Three inexpensive ultra-low-noise MEMS accelerometers were deployed along the Turnagain Arm corridor near Girdwood, Alaska, to evaluate automated seismic avalanche detection. Over 145 days of monitoring, 400 seismic events were recorded including two confirmed avalanches on the same evening (one detected seismically, one confirmed by sensor burial) ...
  • Investigation on Mix Design of Recycled Asphalt Pavement RAP Materials
    Investigation on Mix Design of Recycled Asphalt Pavement (RAP) Materials
    Le, Jia-Liang ;
    Marasteanu, Mihai
    2026-05-01 | PDF
    Recycled asphalt pavement (RAP) is widely used in asphalt mixture production because it reduces material cost, conserves natural resources, and improves sustainability in pavement construction. However, increasing RAP content can also introduce compactability issues and weak cracking resistance. For this reason, a better understanding of RAP materi ...
  • Wet Pond Modeling for Contaminant Retention and Maintenance
    Wet Pond Modeling for Contaminant Retention and Maintenance
    Herb, William ;
    Natarajan, Poornima
    2026-05-01 | PDF
    We have found that many ponds are stratified at 0.3m (1ft) depth, often resulting in a bottom region of low dissolved oxygen water and thereby causing the pond to release phosphorus trapped in the bottom sediments back into the water column. It is critical to maintain treatment capacity to reduce pollution to downstream priority waters. This resear ...
  • Alternative Deicer Performance Characterization Know Before the Snow Addendum
    Alternative Deicer Performance Characterization: Know Before the Snow (Addendum)
    Druschel, Stephen J.
    2026-05-01 | PDF
    MnDOT has been using alternative deicers (potassium chloride, magnesium chloride, and calcium chloride) to melt road way ice at temperatures colder than sodium chloride can melt it alone. Using alternative deicers in brine form has been a way to leverage treatment techniques at temperatures below 15° F. However, these alternative deicers have not y ...
  • Solution to Interfacial Delamination of NMDOTs Asphalt Pavements
    Solution to Interfacial Delamination of NMDOT's Asphalt Pavements
    Alam, Muhammad Tasnim ;
    Tarefder, Rafi
    2026-05-01 | PDF
    This study investigated interfacial delamination in NMDOT's asphalt pavements and developed improved methods for evaluating and improving bonding between asphalt layers. Laboratory testing evaluated four tack coat types: trackless tack, SS-1H, SS-1HP, and CSS-1H. Direct shear tests were used to measure interface shear strength under different tack ...
  • Investigation of Unbraced Pile Height in Fully Encased Pile Bents of Bridge Structures
    Investigation of Unbraced Pile Height in Fully Encased Pile Bents of Bridge Structures
    Dahlberg, Justin ;
    Liu, Zhengyu
    2026-05-01 | PDF
    This study investigated the structural performance of fully encased steel H-piles used in bridge foundations, with a specific focus on the effects of unbraced pile height resulting from scour conditions. While concrete encasement is widely used to protect piles, its structural contribution is often excluded from axial capacity calculations in curre ...
  • Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events Phase II
    Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events: Phase II
    Salahat, Fahed H. ;
    Jones, Christopher A.
    2026-05-01 | PDF
    Reinforced concrete (RC) barriers are often used as railings to protect bridge piers against vehicular collision force (VCF). RC barriers absorb collision energy and/or redirect vehicles. According to bridge design specifications of the American Association of State Highway and Transportation Officials (AASHTO), barriers used to protect bridge pier ...
  • Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life Technical Summary
    Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life [Technical Summary]
    Al Shboul, Khalid W. ;
    Rasheed, Hayder A.
    2026-05-01 | PDF
    Low-cost cantilevered and butterfly sign support structures are commonly used because they more effectively reduce the probability of vehicle collision compared to overhead sign structures. Over time, the span of cantilevered support structures has increased as safety concerns have caused the upright component of the structures to be installed furt ...
  • Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events Phase II Technical Summary
    Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events: Phase II [Technical Summary]
    Salahat, Fahed H. ;
    Jones, Christopher A.
    2026-05-01 | PDF
    The primary objective of this research was to assess the performance of sub-standard RC barriers as protection for bridge piers against VCF and quantify their reduction of the equivalent static force (ESF) that piers must resist according to AASHTO specifications. This report describes current procedures to determine the transverse static capacity ...
  • Iowa Pavement Preservation Guide Tech Transfer Summary
    Iowa Pavement Preservation Guide [Tech Transfer Summary]
    Smadi, Omar
    ORCID ICON IMG
    2026-05-01 | PDF
    The overarching aim of this research was to enhance the understanding of pavement preservation effectiveness in Iowa by (1) quantifying the performance of commonly used preservation techniques across different metrics and (2) evaluating the costs and benefits of those techniques. Building on the data-driven decision-making approach developed in Pha ...
  • Iowa Pavement Preservation Guide
    Iowa Pavement Preservation Guide
    Smadi, Omar ;
    Sassani, Alireza
    2026-05-01 | PDF
    Pavement preservation is an essential component of highway asset management, enabling transportation agencies to maintain roadway performance and extend pavement service life while efficiently allocating limited maintenance resources. This study was conducted in collaboration with the Iowa Department of Transportation (Iowa DOT) to evaluate the eff ...
  • Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles
    Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles
    Inoue, Danilo ;
    Prozzi, Jorge
    2026-05-01 | PDF
    Overweight (OW) vehicles contribute to pavement and bridge deterioration, creating additional maintenance needs that may exceed the revenues generated through existing permit fees. This study developed a methodology for periodically updating Texas OW permit fees to reflect evolving traffic patterns, vehicle configurations, and infrastructure costs. ...
  • Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Wang, Liming ;
    Gregor, Brian
    2026-05-01 | PDF
    This project upgraded the land use module for the VisionEval framework to enhance the evaluation of integrated transportation and land use policies and their impacts. The project developed a new strategic land use model utilizing NHTS and Smart Location Database data from 2011 and 2019, applying advanced statistical and machine learning methods to ...
  • Efficient Methods for Determining Seismic Site Class for Alabama Bridges
    Efficient Methods for Determining Seismic Site Class for Alabama Bridges
    McLeod, Joshua ;
    Okafor, Chukwuma
    2026-05-01 | PDF
    Shear wave velocity (VS) profiles are critical inputs for seismic design of bridges because they influence the amplitude and frequency content of predicted ground motions. Site class, determined using the time-averaged shear wave velocity of the upper 30 meters (100 feet) of a site (VS30), is used in the AASHTO Guide Specifications for LRFD Seismic ...
  • New Technologies for Detecting and Mapping Passages Beneath Missouri Highways
    New Technologies for Detecting and Mapping Passages Beneath Missouri Highways
    Ducey, Luke ;
    Capes, Andrew
    2026-05-01 | PDF
    The Missouri Department of Transportation (MoDOT) commissioned WSP USA Inc., in collaboration with the Missouri University of Science and Technology (Missouri S&T), to evaluate advanced, nonintrusive geophysical and remote sensing technologies for detecting and mapping subsurface passages beneath Missouri highways. Subsurface features such as karst ...
  • MDOT State Study 324 Assessing the Effectiveness of Blue Lights on Work Zone Safety
    MDOT State Study 324: Assessing the Effectiveness of Blue Lights on Work Zone Safety
    Wang, Jun ;
    Howard, Isaac L.
    2026-04-28 | PDF
    This project investigated the effectiveness of blue lights in work zones following the enactment of Mississippi's "Blue Light Law". The methodology combined a systematic literature review, a nationwide survey, and field data analysis. The literature review indicated a lack of standardized guidance. The survey findings showed that practitioners perc ...
  • Safety Effectiveness of NonFreeway Sinusoidal Shoulder Corrugations
    Safety Effectiveness of Non-Freeway Sinusoidal Shoulder Corrugations
    Gates, Timothy J. ;
    Bahrami, Vahid
    2026-04-24 | PDF
    Sinusoidal rumble strips were designed to alleviate noise concerns by reducing roadside noise for residents, while maintaining adequate levels of in-vehicle noise and vibration. However, while research has shown that traditional rumble strip designs are effective towards reducing lane departure crashes, the safety performance of the sinusoidal rumb ...
  • Development of Accurate and Reliable Annual Average Daily Traffic Factoring Methods
    Development of Accurate and Reliable Annual Average Daily Traffic Factoring Methods
    Zhao, Li ;
    Madarshahian, Mahyar
    2026-04-15 | PDF
    Accurate estimation of Annual Average Daily Traffic (AADT) is essential for the Nebraska Department of Transportation (NDOT)to support planning, design, safety evaluation, asset management, and federal reporting requirements. Because continuous traffic monitoring is not feasible at every roadway location, NDOT relies on short-term traffic counts th ...
  • Pavement Markings Retroreflectivity Enhancing Traffic Safety Project Capsule
    Pavement Markings Retroreflectivity: Enhancing Traffic Safety [Project Capsule]
    Dwyer, Carmine E. ;
    Codjoe, Julius
    2026-04-13 | PDF
    The objectives of the project are to: 1. Develop cost-efficient recommendations for maintaining marking retroreflectivity at or above minimum levels on Louisiana state highways; 2. Improve understanding of pavement striping practices and material performance factors that influence the durability and long-term retroreflectivity of pavement markings; ...
  • Effectiveness of Temporary Portable Rumble Strips on Work Zones
    Effectiveness of Temporary Portable Rumble Strips on Work Zones
    Macfarlane, Gregory S. ;
    Schultz, Grant G.
    2026-04-01 | PDF
    This study evaluates the effectiveness and operational implications of Temporary Portable Rumble Strips (TPRS) used by the Utah Department of Transportation (UDOT) to alert drivers to upcoming work zones. While TPRS are intended to capture driver attention and reduce crash risk, concerns remain regarding their influence on driver behavior, avoidanc ...
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