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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 1421 - 1440 of 36873 results
  • Natural Hazards Vulnerability Assessment of the NCDOT Ferry Division Assets
    Natural Hazards Vulnerability Assessment of the NCDOT Ferry Division Assets
    Brock, Tim ;
    Sciaudone, Elizabeth
    2024-07-09 | PDF
    There is a need to evaluate the vulnerability of North Carolina ferry system facilities across the state, both now and as climate change progresses. This will enable the North Carolina Department of Transportation (NCDOT) Ferry Division to plan for adaptation projects to ensure that the system operates successfully into the future. As NCDOT plans f ...
  • Statewide Lane Reconfiguration Road Diet Screening for Louisiana Research Project Capsule 246SS
    Statewide Lane Reconfiguration “Road Diet” Screening for Louisiana: Research Project Capsule [24–6SS]
    Bian, Ruijie “Rebecca” ;
    Rupnow, Tyson
    2024-07-01 | PDF
    This research aims to investigate opportunities for, and the feasibility of, implementing road diets to help Louisiana develop a network that better accommodates non-motorized travel and meets other potential needs (e.g., speed management).
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization Technical Summary
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization [Technical Summary]
    Tavakol, Massoumeh ;
    Kulesza, Stacey
    2024-07-01 | PDF
    The primary objective of this study was to investigate the suitability of D-cracked RCA for subgrade stabilization for hot-mix asphalt (HMA) pavements. This research also evaluated the strength, stiffness, and shrinkage potential of clay subgrade beneath HMA pavements stabilized using D-cracked RCA and various stabilizers. The selected stabilizers ...
  • Assessing the Flood Reduction Benefits of OnRoad Structures
    Assessing the Flood Reduction Benefits of On-Road Structures
    Weber, Larry ;
    Arenas Amado, Antonio
    2024-07-01 | PDF
    Conventional culverts are mainly designed to transport water underneath roadways with minimal headwater buildup, resulting in low to moderate peak flow attenuation. On-road structures (ORS) offer an alternative by using the roadway embankment as a dam, restricting flow into the culvert to provide flood storage during large precipitation events. In ...
  • New Brunswick Innovation Hub Smart Mobility Testing Ground SMTG Technical Brief
    New Brunswick Innovation Hub Smart Mobility Testing Ground (SMTG) [Technical Brief]
    Maher, Ali ;
    Jafari, Mohsen
    2024-07-01 | PDF
    This project instrumented 12 roadside locations along the Route 27 and Route 18 corridors to provide complete coverage of the 2.1-mile testing ground with self-driving grade sensing, computing, and physical and virtual C-V2X technologies. The DataCity testing ground created a living laboratory environment to promote the research, development, and t ...
  • A Review of Protocols Used for Evaluating Defective Asphalt Materials and Pavements
    A Review of Protocols Used for Evaluating Defective Asphalt Materials and Pavements
    West, Randy ;
    Rodezno, Carolina
    2024-07-01 | PDF
    The Florida Department of Transportation (FDOT) construction specifications include procedures to deal with unacceptable materials that do not meet the specification requirements. When the materials are considered “defective,” the engineer can reject those materials, whether in place or not. The contractor is then directed to remove and replace all ...
  • Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete Technical Summary
    Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete [Technical Summary]
    Parsons, Robert L. ;
    Liu, Hao
    2024-07-01 | PDF
    This report provides the results from a study of an LCC-MSE wall test section, including vertical earth pressures and settlement, lateral earth pressures, temperatures throughout the fill, and pullout resistance of reinforcement at various points in the curing process for approximately one year.
  • Influencing Mode Shift Through Behavioral Change Strategies
    Influencing Mode Shift Through Behavioral Change Strategies
    Mishra, Sabyasachee ;
    Golias, Mihalis M.
    2024-07-01 | PDF
    This research is a behavioral approach to address the critical transportation challenges in Tennessee, particularly the reliance on Single Occupant Vehicles (SOVs). Despite efforts by different agencies across the US to promote sustainable alternatives through Travel Demand Management (TDM) initiatives, public participation and the effectiveness of ...
  • Enhancing the GDOTs Maintenance Decision Trees Considering the Effectiveness of Various Treatment Options in Different Geographical Locations and Over Time
    Enhancing the GDOT’s Maintenance Decision Trees Considering the Effectiveness of Various Treatment Options in Different Geographical Locations and Over Time
    Moore, Brian P ;
    Baek, Minsoo
    2024-07-01 | PDF
    The Georgia Department of Transportation (GDOT) is responsible for pavement management of 7,100 centerline miles, encompassing diverse terrain types. The conventional “one size fits all” approach is no longer viable as pavement condition depends on several internal and external factors that are different from district to district, e.g., material, c ...
  • Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete
    Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete
    Parsons, Robert L. ;
    Liu, Hao
    2024-07-01 | PDF
    As an alternative to aggregate as backfill material in mechanically stabilized earth (MSE) walls, lightweight cellular concrete (LCC) significantly reduces the weight of MSE wall mass, corresponding settlement of the foundation soil, and lateral earth pressures behind wall facing. Steel strips, geogrids, or steel rods are commonly used to reinforce ...
  • Findings From the Pavement Preservation Group PG Study
    Findings From the Pavement Preservation Group (PG) Study
    Vargas-Nordcbeck, Adriana ;
    Geib, Jerry
    2024-07-01 | PDF
    State and local agencies often face the challenge of managing their pavement networks with limited resources. The natural degradation of new pavements, influenced by traffic loads and environmental factors, necessitates attention. Extending the service life of pavements without resorting to costly rehabilitation or reconstruction activities is feas ...
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization
    Tavakol, Massoumeh ;
    Kulesza, Stacey
    2024-07-01 | PDF
    Recycled concrete aggregate (RCA) is the byproduct of the demolition of concrete structures and pavements. The use of RCA to replace quarried aggregates in paving projects is one way to utilize these materials and alleviate concerns regarding this increasing waste stream. In this study, a low-plasticity clay in Kansas was stabilized using RCA and t ...
  • Traffic Safety Facts 2022 Data Large Trucks
    Traffic Safety Facts 2022 Data: Large Trucks
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 5,936 people killed in traffic crashes involving large trucks. This was a 2-percent increase from 5,821 in 2021. Seventy percent of people killed in large-truck traffic crashes in 2022 were occupants of other vehicles. Seventy-six percent of the fatal traffic crashes involving large trucks in 2022 occurred on weekdays (6 a.m. Mon ...
  • Fatigue Strength and Ductility of Steel Plates with Holes Made from Plasma Cutting Methods
    Fatigue Strength and Ductility of Steel Plates with Holes Made from Plasma Cutting Methods
    Ebert, Aurora ;
    Connor, Robert J.
    2024-07-01 | PDF
    A literature review was conducted to evaluate current standards and existing research around the use of plasma arc cutting for holes (PACH) in the context of steel bridge applications. Additionally, an investigation into the state of the practice was conducted to determine if the latest technological advancements and equipment capabilities for plas ...
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Portland CementTreated Base Technical Summary
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Portland Cement-Treated Base [Technical Summary]
    Daily, Koby ;
    Jones, Christopher
    2024-07-01 | PDF
    This research was divided into two studies. The first study focused on D-cracked recycled concrete aggregate (RCA) portland cement-treated base. RCA was obtained from D-cracked pavement sources in Topeka and Kansas City. These aggregates were used to batch three PCTB mixtures per RCA source. All mixes followed KDOT’s 90-day curing outlined in KTMR- ...
  • Developing a Hazard Detection and Alert System To Prevent Incidents
    Developing a Hazard Detection and Alert System To Prevent Incidents
    Song, Sejun ;
    Kim, Sungyop
    2024-07-01 | PDF
    The proposed project aimed to develop a cost-effective, user-friendly, and reliable hazard detection and alert system to prevent crashes between construction equipment/vehicles and workers on foot in work zones. The envisioned system includes wearable proximity sensors for the workers and an in-vehicle portable detection system for the operators. T ...
  • Identifying Transit Corridors With Greatest Potential To Benefit From Transit Signal Priority
    Identifying Transit Corridors With Greatest Potential To Benefit From Transit Signal Priority
    Sheffield, Michael H
    2024-07-01 | PDF
    Transit signal priority (TSP) is an operational strategy that facilitates the movement of transit vehicles through signal-controlled intersections. Transit vehicle delay can occur for many reasons including traffic congestion, passenger boarding and alighting, traffic signal operations, and other factors but TSP is specifically aimed at reducing de ...
  • Domestic Airline Fares Consumer Report First Quarter 2024 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2024 Passenger and Fare Information
    United States. Department of Transportation
    2024-07-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges Volume 1 Steel Girder Bridges
    Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges -- Volume 1: Steel Girder Bridges
    Hurlebaus, Stefan ;
    Birely, Anna C.
    2024-07-01 | PDF
    Corroded steel members cause significant risk to the durability of steel bridges, leading to costly failures and endangering public safety. Thus, it is essential to implement effective corrosion prevention and mitigation strategies to ensure the long-term durability of steel girders and reduce risks associated with corrosion activities. The Texas D ...
  • Traffic Safety Facts 2022 Data Speeding
    Traffic Safety Facts 2022 Data: Speeding
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    Twenty-eight percent of fatal crashes, 12 percent of injury crashes, and 8 percent of property-damage-only crashes in 2022 were speeding-related traffic crashes. In 2022 there were 12,151 fatalities in speeding-related crashes, 29 percent of total traffic fatalities for the year and a decrease of 3 percent from 12,498 in 2021. There were an estimat ...
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