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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 821 - 840 of 36104 results
  • Leveraging Probe Data for Improving Incident Management Practice in Rural Areas
    Leveraging Probe Data for Improving Incident Management Practice in Rural Areas
    Yang, Jidong J ;
    Wang, Linbing
    2024-11-01 | PDF
    Traffic data are essential for decision-making by state departments of transportation in planning, designing, operating, maintaining, and rehabilitating transportation systems. However, collecting traffic counts at numerous portable sites in rural areas demands significant time and resources. In response, the Georgia Department of Transportation (G ...
  • Improved Light Weight Deflectometer Test LWD and Analysis
    Improved Light Weight Deflectometer Test (LWD) and Analysis
    Tiwari, Nitin ;
    Shin, Boonam
    2024-11-01 | PDF
    This study focused on improving light weight deflectometer (LWD) testing protocols and understanding material and equipment variability. The Indiana Department of Transportation (INDOT) adopted the LWD test for its efficiency and effectiveness in measuring soil stiffness, a crucial parameter for pavement structural layers. However, challenges remai ...
  • Support XRF Determination of Tire Rubber Content in Asphalt Binders
    Support XRF Determination of Tire Rubber Content in Asphalt Binders
    Bhasin, Amit ;
    Hazlett, Darren
    2024-11-01 | PDF
    This work involved providing support to the Lufkin, Odessa, and Brownwood Districts during their 2024 seal coat season for determining the tire rubber content using portable XRF units. CTR staff travelled to the three districts to conduct training refreshers and assist in analyzing field samples used in district seal coats. Analysis was performed o ...
  • Using Vehicle Probe Data to Evaluate Speed Limits
    Using Vehicle Probe Data to Evaluate Speed Limits
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2024-11-01 | PDF
    When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an a ...
  • Unmanned Aircraft Systems in Land Surveying A Comparative Study of Lidar and Photogrammetry
    Unmanned Aircraft Systems in Land Surveying: A Comparative Study of Lidar and Photogrammetry
    Starek, Michael J. ;
    Berryhill, Jacob
    2024-11-01 | PDF
    The Texas Department of Transportation (TxDOT) is strategically leveraging unmanned aircraft systems (UASs) to advance various initiatives, including land surveying. TxDOT is focused on assessing and documenting the benefits and limitations of UAS survey technology, with a particular emphasis on data quality, repeatability, and overall task suitabi ...
  • Economic Contribution of Kentucky Airports
    Economic Contribution of Kentucky Airports
    Marks, P. Gayle ;
    Paris, Bethany
    2024-11-01 | PDF
    Airports generate economic impacts that are felt well beyond their physical boundaries by supporting commerce, tourism, and the provision of essential services. To understand the economic contributions of airports throughout Kentucky, researchers collected data from general aviation (GA) airports and commercial service (CS) airports across the stat ...
  • Validating the Collection of Skid Data by Assessing Correlation With Crash Data
    Validating the Collection of Skid Data by Assessing Correlation With Crash Data
    Acharya, Sailesh ;
    Subedi, Atul
    2024-11-01 | PDF
    Pavement friction, as measured by metrics such as the skid number (SN), may be linked to traffic safety outcomes. To examine this hypothesis, this cross-sectional study collected data from an interstate highway (I-15) and a non-interstate highway (US-89) within the state of Utah, covering the years 2016 to 2019. For each segment, data included traf ...
  • Report on Agency Survey and National Bridge Inventory Analysis for Damaged Steel Girders
    Report on Agency Survey and National Bridge Inventory Analysis for Damaged Steel Girders
    Schissler, Limo R ;
    Ahershinge, Sanjana
    2024-11-01 | PDF
    Bridge strikes—events where over-height vehicles impact bridge superstructures—are common across the United States and pose significant challenges for bridge owners. When a bridge strike occurs, bridge owners must assess the damage and determine what, if any, action is required. A survey of state highway agencies was conducted, and 23 responses wer ...
  • Best Practices for Dust Control in Minnesota
    Best Practices for Dust Control in Minnesota
    Marti, Michael ;
    Salum, Jimoku
    2024-11-01 | PDF
    More than 50 percent of the road network in the United States are gravel roads, underscoring their crucial role in the transportation system. However, one of the drawbacks and biggest complaints of gravel roads is the dust they generate when vehicles pass, causing inconvenience for residents from dust that settles on homes, yards, and parked cars. ...
    Supporting Files
  • A New Approach to Accelerated Fabrication of Steel Bridges Design Optimization and Demonstration
    A New Approach to Accelerated Fabrication of Steel Bridges: Design, Optimization, and Demonstration
    Thrall, Ashley P ;
    Mutoka, Sherryen C
    2024-11-01 | PDF
    This research developed and demonstrated a new approach to the accelerated fabrication of resilient steel bridges—built-up press-brake formed tub girders (PBTGs). Built-up PBTGs are comprised of webs that are cold bent via a press brake and bolted to separate, flat bottom and top flanges. This investigation included (1) designing and building two d ...
  • Dowel Concrete Interface Material Categorization Performance in Isolated Test Slabs
    Dowel — Concrete Interface Material Categorization & Performance in Isolated Test Slabs
    Izevbekhai, Bernard Igbafen ;
    Aydin, Ceren
    2024-11-01 | PDF
    The Minnesota Department of Transportation (MnDOT) investigated the use of dowel bars with various anchoring methods. This report examines the characteristics of various epoxy and grout anchorage systems at the interface between new construction and existing concrete. Twelve different anchoring materials as well as various anchoring methods were st ...
  • Research Summary Refining MaxPressure Traffic Signal Control to Improve Traffic Flow
    Research Summary: Refining Max-Pressure Traffic Signal Control to Improve Traffic Flow
    Hao, Ben ;
    Stern, Raphael
    2024-11-01 | PDF
    Max-pressure (MP) traffic signal control is a new and innovative control algorithm that uses upstream and downstream vehicle counts to determine signal timing that maximizes throughput. While this method has been extensively tested in simulation, it has not yet been tested on actual traffic signals in the US. To close this gap, this report presents ...
  • Reexamine Minimum Reinforcement Requirements for Shear Design Project Summary
    Re-examine Minimum Reinforcement Requirements for Shear Design [Project Summary]
    Birely, Anna C. ;
    Hueste, Mary Beth D.
    2024-11-01 | PDF
    Minimum shear reinforcement requirements in the Association of State Highway Transportation Officials Load and Resistance Factor Design (LRFD) Bridge Design Specifications are based on tests conducted on reinforced concrete panels and beams. The extension of these requirements to prestressed concrete beams has not been comprehensive and may have in ...
  • Skew Detection System Replacement on Vertical Lift Bridges Phase 2
    Skew Detection System Replacement on Vertical Lift Bridges (Phase 2)
    Rees, Gareth
    2024-11-01 | PDF
    A potential vulnerability of a tower drive vertical lift bridge is a failure to maintain level operation over the length or width of its movable span; this is known as longitudinal or transverse skew, respectively. When either of these conditions occurs, they can cause the movable span to jam in its guides; without adequate protection, this can lea ...
  • Electric Vehicle Simulations Based on KansasCentric Conditions Summary
    Electric Vehicle Simulations Based on Kansas-Centric Conditions [Summary]
    Depcik, Christopher ;
    Simpson, Tyler
    2024-11-01 | PDF
    Range anxiety is a significant contributor to consumer reticence when purchasing Electric Vehicles (EVs); thus, industry is pushing the range of EVs by enhancing lithium-ion battery chemistry. As a result, new commercial EVs readily achieve over 200 miles of range as found by the United States Environmental Protection Agency (EPA). However, this me ...
  • Beautifying Tennessees Roadways and Enhancing Its Ecology By Strategizing Pollinator Habitat Potential
    Beautifying Tennessee's Roadways and Enhancing Its Ecology By Strategizing Pollinator Habitat Potential
    Waldron, Brian ;
    Reyes, Paulina
    2024-11-01 | PDF
    A study was initiated through funding from the Tennessee Department of Transportation (TDOT) and the Federal Highway Administration to develop strategies on infusing pollinator habitat along Tennessee roadways. As part of the investigation, a spatial analysis of soils and topography were conducted statewide and link to TDOT mowable spaces along its ...
  • ReExamining Minimum Reinforcement Requirements for Shear Design Final Report
    Re-Examining Minimum Reinforcement Requirements for Shear Design: Final Report
    Sideris, Petros ;
    Birely, Anna C.
    2024-11-01 | PDF
    Minimum shear reinforcement requirements in the Association of State Highway Transportation Officials Load and Resistance Factor Design (LRFD) Bridge Design Specifications are based on tests conducted on reinforced concrete panels and beams. The extension of these requirements to prestressed concrete beams has not been comprehensive and may have in ...
  • Optimal RWIS Sensor Density and Location Phase IV
    Optimal RWIS Sensor Density and Location – Phase IV
    Wu, Mingjian ;
    Kwon, Tae J
    2024-11-01 | PDF
    Road weather information systems (RWIS), in both stationary and mobile forms, have become increasingly popular in recent decades for their ability to collect and disseminate road weather and surface data. In addition to meteorological measurements, highway agencies rely heavily on RWIS imagery data to guide winter road maintenance (WRM) operations. ...
  • Electric Vehicle Simulations Based on KansasCentric Conditions
    Electric Vehicle Simulations Based on Kansas-Centric Conditions
    Depcik, Christopher ;
    Simpson, Tyler
    2024-11-01 | PDF
    Range anxiety is a significant contributor to consumer reticence when purchasing Electric Vehicles (EVs); thus, industry is pushing the range of EVs by enhancing lithium-ion battery chemistry. As a result, new commercial EVs readily achieve over 200 miles of range as found by the United States Environmental Protection Agency (EPA). However, this me ...
  • Effect of Antioxidant Additives and Recycling Agents on Performance of Asphalt Binders and Mixtures Phase II
    Effect of Antioxidant Additives and Recycling Agents on Performance of Asphalt Binders and Mixtures – Phase II
    Bastola, Nitish R ;
    Ahmed, Muhammad
    2024-11-01 | PDF
    The use of reclaimed asphalt pavement (RAP) in combination with recycling agents (RAs) (i.e., rejuvenators or softening agents) has gained significant attention from the pavement industry as a sustainable pavement solution, reducing the carbon footprint of manufactured products through the conservation of energy and reduction on the use of raw mate ...
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