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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 2321 - 2340 of 36151 results
  • Guidelines for Evaluating Safety Using Traffic Encounters Proactive Crash Estimation on Roadways with Conventional and Autonomous Vehicle Scenarios
    Guidelines for Evaluating Safety Using Traffic Encounters: Proactive Crash Estimation on Roadways with Conventional and Autonomous Vehicle Scenarios
    Tarko, Andrew P. ;
    Romero, Mario A.
    2023-01-01 | PDF
    With the expected arrival of autonomous vehicles, and the ever-increasing levels of automation in today’s human driven vehicles, road safety is changing at a rapid pace. This project aimed to address the need for an efficient and rapid method of safety evaluation and countermeasure identification via traffic encounters, specifically traffic conflic ...
  • Efficient Model for Predicting Friction on Texas Highway Network
    Efficient Model for Predicting Friction on Texas Highway Network
    Sabillon, Christian ;
    Hernandez, Joaquin
    2023-01-01 | PDF
    The objective of this project was to develop a model to predict friction that could be applied at the network level to overcome some of the issues associated with friction measuring equipment. This project developed an instrument that can collect high-resolution surface profiles to determine macrotexture and microtexture under different conditions ...
  • Examining Data Needs and Implementation Process of AVBased Microtransit Service A Case Study in Lake Nona
    Examining Data Needs and Implementation Process of AV-Based Microtransit Service: A Case Study in Lake Nona
    Peng, Zhong-Ren ;
    Liu, Yanghe
    2023-01-01 | PDF
    The development of Autonomous vehicles (AVs) has brought many opportunities but implementing AV-based public transportation services has numerous unforeseen issues. One primary research gap is that existing studies on AV transit systems consist of predictions and speculation without actual cases and data support. Another issue is that a measurement ...
  • Energy Harvesting on New Jersey Roadways
    Energy Harvesting on New Jersey Roadways
    Wang, Hao ;
    Guo, Lukai
    2023-01-01 | PDF
    The project is to identify energy harvesting applications on roadways and bridges and conduct feasibility analysis and performance evaluation for large-scale and micro-scale energy generation. Solar energy harvesting can be achieved using different assets of roadway. The technical and economic feasibility of solar array in the right-of-way (ROW) wa ...
  • Predictive Analytics for Quantifying the LongTerm Costs of Defects During Bridge Construction
    Predictive Analytics for Quantifying the Long-Term Costs of Defects During Bridge Construction
    Criner, Nichole Marie ;
    Salmeron, Manuel
    2023-01-01 | PDF
    During the lifecycle of a bridge, deterioration of the concrete deck originates from many sources, e.g., corrosion due to water infiltration in conjunction with chlorides from the use of de-icing salts. Such deterioration may be affected by any one of the following six actions relevant to a bridge from conception to demolition: design, construction ...
  • Interlayer Mixture Design
    Interlayer Mixture Design
    Christensen, Donald W.
    2023-01-01 | PDF
    The purpose of this research was to develop a simple alternative to flexural fatigue testing for ensuring the fatigue performance of Interlayer Mixture Designs (IMOs) in Wisconsin. The research approach involved producing 15 different mixtures and characterizing these mixtures using the CT index as determined from the ideal CT test, and characteriz ...
  • Innovative Techniques and Materials for Preventing Concrete Shrinkage Cracking Technical Brief
    Innovative Techniques and Materials for Preventing Concrete Shrinkage Cracking [Technical Brief]
    Lomboy, Gilson R. ;
    Venkiteela, Giri
    2023-01-01 | PDF
    The study aims to improve the longevity and performance of New Jersey transportation infrastructure by reducing the concrete shrinkage and cracking potential and limiting the ingress of water and other deleterious substances into the concrete. Innovative techniques and materials for preventing shrinkage were studied in New Jersey materials and cond ...
  • Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass Southwestern Oregon July 2018February 2021
    Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon, July 2018–February 2021
    Gingerich, Stephen B. ;
    Wise, Daniel R
    2023-01-01 | PDF
    The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation (ODOT), evaluated the effects of cold-weather chloride deicers (road deicing chemicals) on groundwater quality, with a focus on chloride, near the Siskiyou Pass in southwestern Oregon. The study covered the period during July 2018 through February 2021. Between ...
  • Reducing Winter Maintenance Equipment Fuel Consumption Using Advanced Vehicle Data Analytics Appendices
    Reducing Winter Maintenance Equipment Fuel Consumption Using Advanced Vehicle Data Analytics: Appendices
    Northrop, William ;
    Reddy Challa, Dinesh
    2023-01-01 | PDF
    This project analyzes the impact that idling and snowfall have on the fuel consumed by MnDOT’s snowplow fleet, with the underlying objective to determine and advise MnDOT on ways to reduce fuel usage of the fleet using vehicle telematics data. This is a significant problem to solve as fuel use reduction contributes to MnDOT’s sustainability goals o ...
  • Maintenance of Roadway Edge DropOff Utilizing Readily Available Materials Tech Summary
    Maintenance of Roadway Edge Drop-Off Utilizing Readily Available Materials [Tech Summary]
    Gautreau, Gavin P.
    2023-01-01 | PDF
    This research evaluated the effectiveness of different strategies like RAP and soil with additives like fly ash and cement as possible shoulder material solutions to reduce and hopefully eliminate the edge drop-off safety issues within the state. This research evaluated the application, performance, and cost-effective solutions of different alterna ...
  • Traffic Safety Facts 2020 Data Older Population
    Traffic Safety Facts 2020 Data: Older Population
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-01-01 | National Transportation Statistics (NTS) | PDF
    In 2020 there were 6,549 people 65 and older killed in traffic crashes in the United States, accounting for 17 percent of all traffic fatalities. From 2019 to 2020 there was a 10-percent decrease in the number of people 65 and older killed in traffic crashes.
  • Field Monitoring of JointLess Curved Integral Abutment Bridge in Nebraska
    Field Monitoring of Joint-Less Curved Integral Abutment Bridge in Nebraska
    Ziaei, Ramin ;
    Alhowaidi, Yusuf
    2022-12-31 | PDF
    The research objective of this project is to study the behavior of the curved full integral abutment bridge designed in Nebraska through field monitoring and numerical simulation to 1) understand and model the complex short-term and long-term behavior of curved integral abutment bridges, 2) evaluate if the details provided in Nebraska (pile embedme ...
  • 07061 Optimizing Laboratory Curing Conditions for Hot Mix Asphalt to Better Simulate Field Behavior Brief
    0-7061: Optimizing Laboratory Curing Conditions for Hot Mix Asphalt to Better Simulate Field Behavior [Brief]
    Nazarian, Soheil ;
    Bhasin, Amit
    2022-12-31 | PDF
    The engineering properties of asphalt mixtures change with time. Shortly after placement, asphalt concrete (AC) layers are more susceptible to rutting. As the pavement ages, the AC layer becomes stiffer, brittle, and thus more susceptible to cracking. Current protocols provide guidelines for the selection of materials, the determination of the mate ...
  • Develop Improved Methods for Eliminating Striping on Roadway Surfaces Project Summary
    Develop Improved Methods for Eliminating Striping on Roadway Surfaces [Project Summary]
    Manzo, Maurizio ;
    Huang, Zhenhua
    2022-12-31 | PDF
    The project aimed to investigate current removal techniques and to put together and test a pulsed solid state fiber laser system as an alternative method for road markings removal. Firstly, a literature review and a national survey were conducted to understand the current state-of-the-art and industry standards regarding the removal of road stripes ...
  • Assessing System Performance of the Michigan Trunkline Measures and Analytical Procedures for Planning and Operations
    Assessing System Performance of the Michigan Trunkline: Measures and Analytical Procedures for Planning and Operations
    Zockaie, Ali ;
    Kamjoo, Ehsan
    2022-12-31 | PDF
    The Moving Ahead for Progress in the 21st Century Act (MAP-21) required transportation agencies to use performance-based approaches, and there are federal guidelines and programs to help agencies develop performance management systems. For the performance management strategies to be effective, it is critical to establish performance measures that a ...
  • Curved Integral Abutment Bridge Research Draft Final Report
    Curved Integral Abutment Bridge Research – Draft Final Report
    WSP USA Inc.  ...
    2022-12-28 | PDF
    The purpose of this research initiative is to investigate the effects of the degree of curvature on the behavior of curved integral abutment structures, with consideration for various skews, span lengths and layouts, and pile cantilever lengths. The results of this research will provide recommendations to implement findings through a design guideli ...
  • Competitive Bidding in Construction Contracting
    Competitive Bidding in Construction Contracting
    Liu, Hexu ;
    Kwigizile, Valerian
    2022-12-21 | PDF
    Competitive bidding and accurate cost estimation allow state departments of transportation (DOTs) to make effective use of budgeted funds to deliver construction projects. However, the different bidding procedures and practices in use affect the market competition in competitive bidding. For many state DOTs, including Michigan DOT (MDOT), obtaining ...
  • Public Perceptions of Transportation Fees Taxes and Electric Vehicles in North Carolina
    Public Perceptions of Transportation Fees, Taxes and Electric Vehicles in North Carolina
    Findley, Daniel ;
    Davis, Joy
    2022-12-15 | PDF
    This research effort is part of a collaborative research project between the North Carolina Department of Transportation (NCDOT) and North Carolina State University’s (NCSU’s) Institute for Transportation Research and Education. As North Carolina confronts increasing transportation budget deficits, reliable revenue generating mechanisms will become ...
  • HumanAugmented Technology Interaction HATI for Improving Construction Quality Control and Task Monitoring An Application of Augmented Reality AR for Visualization and Remote Project Management Support
    Human-Augmented Technology Interaction (HATI) for Improving Construction Quality Control and Task Monitoring: An Application of Augmented Reality (AR) for Visualization and Remote Project Management Support
    Ayer, Steven ;
    El Kassis, Rita
    2022-12-01 | PDF
    Construction projects often require effective communication between project participants dispersed across various physical locations. Traditional methods of communication might rely on site visits or telephone calls. However, site visits can lead to wasted time traveling to remote sites, and phone calls can omit critical site details due to limited ...
  • Electric Vehicle Infrastructure Plan in Illinois
    Electric Vehicle Infrastructure Plan in Illinois
    Kontou, Eleftheria ;
    Wu, Yen-Chu
    2022-12-01 | PDF
    We study the allocation of dynamic electric vehicle charging investments from the policymaker’s perspective, which aims to meet statewide emission-reduction targets for the Illinois passenger vehicle sector. We determine statewide charging deployment trajectories over a 30-year planning horizon and estimate their emission reduction. Electric vehicl ...
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