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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 5801 - 5820 of 36053 results
  • Development of Multimodal Traffic Signal Control
    Development of Multimodal Traffic Signal Control
    Rakha, Hesham A. ;
    Abdelghaffar, Hossam
    2019-05-01 | PDF
    Traffic congestion affects traveler mobility and also has an impact on air quality, which negatively affects public health. Sustainable mobility could enhance air quality and alleviate congestion. Accordingly, optimizing the utilization of the available infrastructure using advanced traffic signal controllers has become necessary to mitigate traffi ...
  • How Will Autonomous Vehicles Change Local Government Budgeting and Finance Case Studies of OnStreet Parking Curb Management and Solid Waste Collection
    How Will Autonomous Vehicles Change Local Government Budgeting and Finance? Case Studies of On-Street Parking, Curb Management, and Solid Waste Collection
    Clark, Benjamin Y
    ORCID ICON IMG
    2019-05-01 | PDF
    This report is an examination of parking, curb zones, and government service changes in the context of AVs. Given that there are very few actual AVs on the road, the analysis in this report is an attempt to project what we might see, using the current phenomenon as starting points. The report uses a mix of econometric modeling, cost accounting, and ...
  • Optimizing the Effective Use of RAP in Local Roadways
    Optimizing the Effective Use of RAP in Local Roadways
    Nazzal, Munir D. ;
    Kim, Sang Soo
    2019-05-01 | PDF
    This report summarizes the research work that was completed to assess the optimum percentages of recycled asphalt pavement (RAP) that can be used in surface course mixtures of local roadways while ensuring durability is maintained. This project was divided into two phases. Phase 1 included conducting a comprehensive laboratory testing on mixtures w ...
  • Optimizing the Effective Use of RAP in Local Roadways Factsheet
    Optimizing the Effective Use of RAP in Local Roadways [Factsheet]
    Ohio University. Department of Civil Engineering
    2019-05-01 | PDF
    Asphalt pavement is the most recycled material in the United States. Reclaimed asphalt pavement (RAP) material contains asphalt binder and aggregates. Therefore, using RAP in new asphalt mixtures results in significant economic savings and environmental benefits. However, using high amounts of RAP in new paving mixtures presents a concern that the ...
  • A Mechanistic Approach to Utilize Traffic Speed Deflectometer TSD Measurements into Backcalculation Analysis
    A Mechanistic Approach to Utilize Traffic Speed Deflectometer (TSD) Measurements into Backcalculation Analysis
    Elseifi, Mostafa A. ;
    Zihan, Zia U. A.
    2019-05-01 | PDF
    Backcalculation analysis of pavement layer moduli is typically conducted based on the Falling Weight Deflectometer (FWD) measurements; however, the stationary nature of FWD requires lane closure and traffic control. To overcome these limitations, a number of continuous deflection devices were introduced in recent years including the Traffic Speed D ...
  • Optimizing ADA Paratransit Operation with Taxis and Ride Share Programs
    Optimizing ADA Paratransit Operation with Taxis and Ride Share Programs
    Gonzales, Eric J. ;
    Sipetas, Charalampos
    2019-05-01 | PDF
    Rising ridership on Americans with Disabilities Act (ADA) paratransit services, such as MBTA’s The RIDE, pose a challenge due to the high costs of operating this required service. This report presents the findings of a study to analyze the operations and ridership of The RIDE’s van service and to optimize programs to serve paratransit trips with al ...
  • Durability of the Grouted Shear Stud Connection at Low Temperatures
    Durability of the Grouted Shear Stud Connection at Low Temperatures
    Jayaprakash, Arjun ;
    Nau, James M.
    2019-05-01 | PDF
    The grouted shear stud (GSS) connection for steel bridge substructures was developed as a ductile alternative to directly welded column to cap-beam connections. The GSS connection utilizes plastic hinge relocation to eliminate brittle cracking at the weld region and provides full strength and ductility capacity for steel bridge columns. However, th ...
  • Providing Traffic Control Device Information in a Connected and Automated Vehicle Environment
    Providing Traffic Control Device Information in a Connected and Automated Vehicle Environment
    Boateng, Richard ;
    Park, Hyungjun
    2019-05-01 | PDF
    Traffic control devices (TCDs) play a critical role in delivering regulatory, warning, informational, and guidance information to drivers. Transportation agencies devote considerable resources to support TCD installation and maintenance. However, as connected vehicles develop and vehicle automation becomes a reality, the potential exists to replace ...
  • Impact of Inundation on Roadway Pavements Case Study LA 493
    Impact of Inundation on Roadway Pavements: Case Study– LA 493
    Gaspard, Kevin ;
    Zhang, Zhongjie
    2019-05-01 | PDF
    LTRC has conducted a research study on LA 493 that provides evidence of damage to roadways caused by inundation. The evidence supporting this comes from three sources: a rod and level cross-section survey taken approximately one month prior to the first inundation event and subsequent cross-section surveys taken after the first to third inundation ...
  • Impact of Traffic Signal Controller Settings on the Use of Advanced Detection Devices
    Impact of Traffic Signal Controller Settings on the Use of Advanced Detection Devices
    Sunkari, Srinivasa R ;
    Bibeka, Apoorba
    2019-05-01 | PDF
    Traffic signal settings have historically been developed using inductive loops as the predominant detection device. Detection technology has changed significantly over the years. This research studied the impact of controller settings on design and operations of a signalized intersection where traditional detection technology is not used. Researche ...
  • Test and Evaluate a Bluetooth Based InVehicle Message System to Alert Motorists in Work Zones
    Test and Evaluate a Bluetooth Based In-Vehicle Message System to Alert Motorists in Work Zones
    Liao, Chen-Fu
    2019-05-01 | PDF
    Safe and efficient traffic flow in a work zone is a major concern for transportation agencies. To reduce risky behavior around work zones, we have developed a prototype system to investigate the feasibility of using in-vehicle messages to increase drivers’ awareness of safety-critical and pertinent work zone information. Our previous effort focused ...
  • Implementation and Evaluation of a Buried Cable Roadside Animal Detection System and Deer Warning Sign
    Implementation and Evaluation of a Buried Cable Roadside Animal Detection System and Deer Warning Sign
    Druta, Cristian ;
    Alden, Andrew S.
    2019-05-01 | PDF
    Animal-vehicle collisions (AVC), and deer-vehicle collisions (DVC) in particular, are a major safety problem on Virginia roads. Mitigation measures such as improved fencing and location-specific driver alerts are being implemented and evaluated in Virginia and elsewhere. One of the most promising mitigation methods uses a buried cable animal detect ...
  • Improving Intersection Safety through Variable Speed Limits for Connected Vehicles
    Improving Intersection Safety through Variable Speed Limits for Connected Vehicles
    Levin, Michael W. ;
    Chen, Rongsheng
    2019-05-01 | PDF
    Autonomous vehicles create new opportunities for innovative intelligent traffic systems. Variable speed limits, which is a speed management systems that can adjust the speed limit according to traffic condition or predefined speed control algorithm on different road segments, can be better implemented with the cooperation of autonomous vehicles. Th ...
  • Investigating Wastewater Reuse at MnDOT Truck Stations
    Investigating Wastewater Reuse at MnDOT Truck Stations
    Heger, Sara ;
    Doro, Jessica
    2019-05-01 | PDF
    The University of Minnesota (UMN) and the Minnesota Department of Transportation (MnDOT) conducted a study to determine whether implementing a wastewater reuse program would be a feasible option for MnDOT-owned truck washing stations. MnDOT has 137 truck stations in the state, where trucks are frequently washed to remove road salt build-up. MnDOT r ...
  • Stockpiling Cold Central Plant Recycling Mixtures
    Stockpiling Cold Central Plant Recycling Mixtures
    Bowers, Benjamin F. ;
    Diefenderfer, Brian K
    2019-05-01 | PDF
    The Virginia Department of Transportation (VDOT) contracted to reconstruct and add new lanes to a portion of Interstate 64 near Williamsburg. As the work progressed, the contractor requested permission to produce and stockpile the cold central plant recycling (CCPR) mixture that was being used on the project. Since VDOT’s specifications did not add ...
  • Initial Analytical Investigation of Overhead Sign Trusses with Respect to Remaining Fatigue Life and Predictive Methods for Inspection Technical Summary
    Initial Analytical Investigation of Overhead Sign Trusses with Respect to Remaining Fatigue Life and Predictive Methods for Inspection [Technical Summary]
    Alshareef, Husam Aldeen ;
    Rasheed, Hayder A.
    2019-05-01 | PDF
    Most state highway agencies do not perform routine fatigue inspections on highway signs, luminaires, and traffic signals, thereby increasing the potential for unnoticed fatigue cracking. The Kansas Highway System utilizes over 450 sign trusses, most of which have been in service for 30–45 years. In addition to aging support structures, the structur ...
  • Investigation of Variations in Corrosion Potential in Mechanically Stabilized Earth Backfill Due to Migration of Fines Technical Summary
    Investigation of Variations in Corrosion Potential in Mechanically Stabilized Earth Backfill Due to Migration of Fines [Technical Summary]
    Breckwoldt, Chase ;
    Parsons, Robert L.
    2019-05-01 | PDF
    Departments of Transportation have constructed thousands of mechanically stabilized earth (MSE) walls to support bridge abutments in highway projects and for other applications. These MSE walls often include metal strips or grids as reinforcement, typically galvanized steel strips within granular backfill meeting Federal Highway Administration (FHW ...
  • National Pedestrian and Bicycle Safety Data Clearinghouse Phase I Inventory Framework
    National Pedestrian and Bicycle Safety Data Clearinghouse Phase I: Inventory & Framework
    Nordback, Krista ;
    Kumfer, Wesley
    2019-05-01 | PDF
    Safety researchers, especially those studying bicycle and pedestrian safety, often struggle to obtain sufficiently high-quality data to conduct robust safety studies. The goal of the project is to create an online centralized data clearinghouse for bicycle and pedestrian safety-related data as a national resource for safety researchers to expedite ...
  • Performance and Policy Related to Aluminum Culverts in Wisconsin
    Performance and Policy Related to Aluminum Culverts in Wisconsin
    Beaver, Jesse L ;
    Bass, Brent J
    2019-05-01 | PDF
    Current Wisconsin Department of Transportation policy severely limits the use of aluminum drainage structures (pipe and boxculverts) based on the observation of pitting corrosion from deicing salts that led to the failure of an aluminum culvert inWisconsin in 1993. The research goal is to establish best practices for aluminum culvert use and formul ...
  • Mitigating Construction Impacts on Local Businesses Transportation Research Synthesis
    Mitigating Construction Impacts on Local Businesses: Transportation Research Synthesis
    CTC & Associates LLC
    2019-05-01 | PDF
    The Minnesota Department of Transportation (MnDOT) Office of Public Engagement & Constituent Services is evaluating how MnDOT and other states are working to mitigate the impacts of construction projects on local businesses. Successful approaches are being sought in the areas of communication strategies, construction techniques that mitigate noise ...
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