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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 1181 - 1200 of 36873 results
  • 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 ...
  • 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 ...
  • 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 ...
  • MD 210 Before and After Case Study for Speed Management Practices
    MD 210 Before and After Case Study for Speed Management Practices
    Franz, Mark L. ;
    Zahedian, Sara
    2024-11-01 | PDF
    MD 210 is known as one of the most dangerous roads in the state of Maryland. While MDOT SHA is aware that speeding is contributing factor in most crashes on MD 210, conventional efforts to reduce speeding, such as signing and automated speed enforcement have not been successful. In addition to speeding, driving behaviors such as harsh braking, hars ...
  • Project Summary CostBenefit Analysis of FuelEfficient Speed Control using SPaT Data
    Project Summary: Cost/Benefit Analysis of Fuel-Efficient Speed Control using SPaT Data
    Minnesota. Department of Transportation
    2024-11-01 | PDF
    MnDOT’s Connected Corridor project in 2020 contributed to progress in the development and deployment of technology for vehicle-to-infrastructure communications. Using signal phasing and timing (SPaT) data from signalized intersections to control driving speed, this project completed a cost benefit analysis for use of SPaT data in connected vehicles ...
  • Project Summary RealTime Integration of Arrow Board Messages into Traveler Information Systems
    Project Summary: Real-Time Integration of Arrow Board Messages into Traveler Information Systems
    Minnesota. Department of Transportation  ...
    2024-11-01 | PDF
    Many DOTs struggle with real-time information being relayed to their users in situations that involve lane closures. Due to the variability in location and duration, real-time integration of arrow board messages into traveler information systems became an item of interest for MnDOT to provide up-to-date data to travelers.
  • Project Summary Connected Corridor
    Project Summary: Connected Corridor
    Minnesota Department of Transportation  ...
    2024-11-01 | PDF
    The Connected Corridor was a foundational Connected Vehicle (CV) project along TH-55 that included planning, design, deployment, and operation of CV technologies to create a better understanding of what is required for planning and preparing for emerging transportation technologies. This initiative showcased technologies to improve the safety and e ...
  • MASH Testing of Luminaire Pole behind Single Slope Traffic Rail
    MASH Testing of Luminaire Pole behind Single Slope Traffic Rail
    Bligh, Roger P. ;
    Bastin, Brianna
    2024-11-01 | PDF
    The purpose of the test reported herein was to assess the performance of a luminaire pole mounted behind a single slope traffic rail according to the safety-performance evaluation guidelines included in the second edition of the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH) (1). The c ...
  • Factors Influencing Pedestrian Decisions to Cross MidBlock and Potential Countermeasures
    Factors Influencing Pedestrian Decisions to Cross Mid-Block and Potential Countermeasures
    Xie, Kun ;
    Yang, Hong
    2024-11-01 | PDF
    About 70% of pedestrian fatalities involve mid-block crossings in Virginia. To address this critical safety issue, this research aims to investigate factors influencing pedestrian decisions to cross at mid-block locations and identify potential countermeasures to enhance pedestrian safety. The research team employed a multifaceted approach. A compr ...
  • Development of a MASH TL4 Portable Concrete Barrier with Large Scupper
    Development of a MASH TL-4 Portable Concrete Barrier with Large Scupper
    Bligh, Roger P. ;
    Silvestri-Dobrovolny, Chiara
    2024-11-01 | PDF
    Portable concrete barriers are commonly used as temporary positive protection in work zone applications to shield motorists from hazards in the work zone and protect workers from errant vehicles. They are also used in permanent applications as a median barrier to mitigate serious cross-median crashes by preventing penetration of errant vehicles int ...
  • LWD DCP Testing for Pavement Foundation and Subbase
    LWD & DCP Testing for Pavement Foundation and Subbase
    Solaimanian, Mansour ;
    Guo, Xiaogang
    2024-11-01 | PDF
    This research effort was undertaken to establish test methods, limits, and protocols to implement lightweight deflectometer (LWD) and dynamic cone penetrometer (DCP) testing and acceptance criteria for Pennsylvania’s subgrade soil and unbound pavement layers. Historically, density-based criteria have been predominantly used to assess the subgrade/b ...
  • 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 ;
    Ahmad, 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 ...
  • 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. ...
  • NHTSA TireRelated Surveys Results and Implications
    NHTSA Tire-Related Surveys: Results and Implications
    Kindelberger, John C
    2024-11-01 | PDF
    Low tire pressure has been shown to be an issue of safety and of fuel economy. Federal Motor Vehicle Safety Standard No. 138 required a tire pressure monitoring system (TPMS) in most passenger vehicles with a gross vehicle weight rating under 10,000 lb. as of September 2008 with a phase-in starting in September 2006. NHTSA conducted an evaluation s ...
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