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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 681 - 700 of 35811 results
  • Advancing the Use of DWTR in Stormwater Treatment Features to Enhance Phosphorus Removal for Transportation Projects
    Advancing the Use of DWTR in Stormwater Treatment Features to Enhance Phosphorus Removal for Transportation Projects
    Roy, Eric ;
    Hurley, Stephanie
    2024-11-12 | PDF
    Stormwater runoff from urban areas threatens water quality and ecosystems around the world. For freshwater ecosystems, phosphorus (P) is often a primary concern, as excess P loading can cause eutrophication, symptoms of which include harmful algal blooms and oxygen depletion. Dissolved P forms are taken up by primary producers and are therefore a p ...
  • Evaluating the Correlation between Slip Resistance and Skid Resistance of Pavement Markings at Crosswalks
    Evaluating the Correlation between Slip Resistance and Skid Resistance of Pavement Markings at Crosswalks
    Goulias, Dimitrios ;
    Aljarrah, Osama
    2024-11-08 | PDF
    Pavement markings are crucial for ensuring the safe and efficient movement of vehicles, cyclists and pedestrians at crosswalks. They provide essential guidance in lane navigation, road sharing, and safety compliance. With growing emphasis on safety in urban areas, crosswalk markings are becoming more prevalent. The primary objectives of this projec ...
  • 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 ...
  • NHTSA TireRelated Surveys Results and Implications
    NHTSA Tire-Related Surveys: Results and Implications
    Kindelberger, John C
    2024-11-01 | National Transportation Statistics (NTS) | 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 su ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Reconsidering the Impact of Access Spacing on Crash Risk
    Reconsidering the Impact of Access Spacing on Crash Risk
    Xie, Kun ;
    Yang, Hong
    2024-11-01 | PDF
    The spacing of access points is one of the most critical elements in access management. This project aims to investigate the effect of access spacing on crash risk using scientifically rigorous statistical methods and to examine VDOT’s current access spacing standards. Specifically, the study focuses on unsignalized access types located on principa ...
  • Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops 2024
    Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops [2024]
    Anderson, Camille ;
    Runyan, Samuel L
    2024-11-01 | PDF
    Reducing the number of through travel lanes requires drivers to decide where and when they will merge from the lane that is being dropped (the short lane) to the adjacent through lane. When a large proportion of drivers choose to merge significantly upstream, this can result in poor lane utilization at an upstream signal which, in turn, leads to un ...
  • Develop and Validate Precast Column Solutions for Texas Bridges
    Develop and Validate Precast Column Solutions for Texas Bridges
    Montero-Carvajal, Emmanuel ;
    Kotha, Chakravarthi
    2024-11-01 | PDF
    This research addresses the application of precast columns in Texas bridge construction. The project combines experimental and analytical methods to develop innovative design concepts and construction details for precast concrete columns. Key design concept includes a spun-cast precast shell filled with a cast-in-place (CIP) core and connecting rei ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges
    Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges
    Ganesh, Thiagarajan ;
    Finke, John
    2024-11-01 | PDF
    Traditionally, MoDOT performed bridge load ratings using the Load Factor Rating (LFR) methodology. With the adoption of Load and Resistance Factor Design based Load and Resistance Factor Rating (LRFR) methodology, MoDOT is migrating to LRFR for rating bridges. The primary goal of this study is to develop and recommend load posting policies using th ...
    Supporting Files
  • Determining an Acceptable California Bearing Ratio CBR Value for Kansas Subgrades Based on Pavement Distress Data
    Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data
    Perić, Dunja ;
    Goh, Gyuhyeong
    2024-11-01 | PDF
    The major objective of this study was to develop scientifically based recommendations for acceptable California Bearing Ratio (CBR) values for Kansas subgrades. To this end, multiple statistical analyses including: 1) Principal Component Regression Analysis (PCRA), 2) Regression Analysis (RA), 3) Multivariate Principal Component Regression Analysis ...
  • Determining an Acceptable California Bearing Ratio CBR Value for Kansas Subgrades Based on Pavement Distress Data Technical Summary
    Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data [Technical Summary]
    Perić, Dunja ;
    Goh, Gyuhyeong
    2024-11-01 | PDF
    California Bearing Ratio (CBR) of subgrade soils, which can be used in design of flexible pavements, can be obtained from Dynamic Cone Penetrometer (DCP) tests through a statistical correlation. The main objective of this study was to determine an acceptable CBR value based on the use of statistical pavement performance evaluation models. To this e ...
  • 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 ...
  • Skew Detection System Replacement on Vertical Lift Bridges Phase 2 Technical Summary
    Skew Detection System Replacement on Vertical Lift Bridges (Phase 2) [Technical Summary]
    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 ...
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