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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 1701 - 1720 of 36114 results
  • Energy Dissipation Optimization for Circular Culverts
    Energy Dissipation Optimization for Circular Culverts
    Admiraal, David M. ;
    Zhang, Chi
    2023-09-05 | PDF
    Two types of energy dissipation devices at circular culvert outlets were investigated: full-length weirs and staggered weirs. Related literature was reviewed; a model broken-back circular culvert and dissipation basin was built; instrumentation was installed to measure discharge, piezometric head, and velocities; and four sizes of full-length and s ...
  • Artificial Intelligence AI Based Tool to Estimate Contact Time
    Artificial Intelligence (AI) Based Tool to Estimate Contact Time
    Jeong, H David ;
    Alikhani, Hamed
    2023-09-01 | PDF
    MDT is in the process of modernizing their contract time determination processes by developing user-friendly tools to facilitate the estimation process of project duration and contract time. As part of this modernization effort, a top-down project duration estimation tool was developed in this research project. This tool is particularly useful when ...
  • Evaluation of Messaging Techniques to Increase Vehicle Spacing at Work Zones
    Evaluation of Messaging Techniques to Increase Vehicle Spacing at Work Zones
    Oh, Minsoo ;
    Shaw, John
    2023-09-01 | PDF
    Rear-end collisions in work zones, induced primarily by speeding and tailgating, are a predominant concern for roadway safety. Although considerable research has shed light on the dangers and implications of speeding within these zones, there exists a conspicuous research gap on tailgating behaviors. To address this gap, the present project was con ...
  • RightTurn Safety for WalkingBicycling Impacts of CurbCorner Radii and Other Factors
    Right-Turn Safety for Walking/Bicycling: Impacts of Curb/Corner Radii and Other Factors
    Singleton, Patrick A. ;
    Mekker, Michelle
    2023-09-01 | PDF
    The objective of this research project is to understand factors (especially curb/corner radii) affecting safety at intersections involving right-turning vehicles and pedestrians/bicyclists. A mixed-methods approach was used, combining crash data analysis with analysis of observational video data. For the crash analysis, data were assembled about mo ...
  • Leveraging Artificial Intelligence AI Techniques to Detect Forecast and Manage Freeway Congestion Technical Report
    Leveraging Artificial Intelligence (AI) Techniques to Detect, Forecast, and Manage Freeway Congestion: Technical Report
    Das, Subasish ;
    Tsapakis, Ioannis
    2023-09-01 | PDF
    Enhancing the quality and efficiency of the Texas surface transportation system necessitates reliable predictions about the initiation and dispersion of prolonged congestion, as well as effective tracking of atypical events and their potential evolution. Artificial intelligence (AI) offers a unique avenue for achieving these goals, presenting an op ...
  • Next Generation LifeCycle Cost Analysis Tool for Bridges in Iowa Phase II
    Next Generation Life-Cycle Cost Analysis Tool for Bridges in Iowa – Phase II
    Alipour, Alice ;
    Shafei, Behrouz
    2023-09-01 | PDF
    To meet the requirements of the Moving Ahead for Progress in the 21st Century (MAP-21) Act of 2012, a life-cycle cost analysis management (LCCAM) tool was developed to manage the maintenance actions of the portion of National Highway System (NHS) for the Iowa Department of Transportation (DOT). The LCCAM software that was developed with the coopera ...
  • Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements
    Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements
    Green, Roger ;
    Rodezno, Carolina
    2023-09-01 | PDF
    The Tensile Strength Ratio (TSR) test is the most widely used test by state agencies based on a survey and specification review. The next most widely used test is the Hamburg Wheel-Track Test (HWTT). The survey also found there has been a move from the TSR test to the HWTT by state agencies over the last 10 years. Limited TSR and HWTT testing for t ...
  • Effective JumpOuts for WhiteTailed Deer and Mule Deer
    Effective Jump-Outs for White-Tailed Deer and Mule Deer
    Huijser, Marcel P. ;
    Getty, Samantha C
    2023-09-01 | PDF
    The height of jump-outs along a fenced road corridor should be low enough for the target species to readily jump down from the fenced road corridor to the safe side, or the habitat side, of the fence. At the same time, the jump-outs should be high enough to discourage animals from jumping from the habitat side of the fence up into the fenced road c ...
  • Testing Protocol Data Storage and Recalibration for PavementME Design
    Testing Protocol, Data Storage, and Recalibration for Pavement-ME Design
    Haider, Syed Waqar ;
    Kutay, M. Emin
    2023-09-01 | PDF
    This study focuses on calibrating and validating performance models for pavement in Michigan and provides testing protocols for field and laboratory material testing. The research team selected various new and rehabilitation projects for flexible and rigid pavements to evaluate previous calibration efforts, verify global models in the Pavement-ME, ...
  • Next Generation LifeCycle Cost Analysis Tool for Bridges in Iowa Phase II Tech Transfer Summary
    Next Generation Life-Cycle Cost Analysis Tool for Bridges in Iowa – Phase II [Tech Transfer Summary]
    Alipour, Alice ;
    Shafei, Behrouz
    2023-09-01 | PDF
    The overarching goal of this project was to upgrade the life-cycle cost analysis management (LCCAM) software tool for continued use by the Iowa Department of Transportation (DOT). Specific objectives were as follows: • Integrate road user cost calculations into the software without disrupting the current maintenance management procedure for bridge ...
  • Continuous Moisture Measurement during Pavement Foundation Construction
    Continuous Moisture Measurement during Pavement Foundation Construction
    Baker, Mark ;
    Zuniga, Isaac E
    2023-09-01 | PDF
    The variations in electromagnetic and electric properties with the moisture content of several geomaterials were assessed in this report to demonstrate their viability in estimating the moisture content of compacted geomaterials. A prototype device was also designed and fabricated to estimate the moisture content of compacted geomaterials by measur ...
  • Inspection Training Course on Bridge Preventive Maintenance Activities
    Inspection Training Course on Bridge Preventive Maintenance Activities
    Wells, Danny ;
    Palle, Sudhir
    2023-09-01 | PDF
    Despite over 30 percent of bridges in the United States having exceeded their 50-year design lives, most state departments of transportation (DOTs) lack the funding needed to replace bridges on a large scale. In response, agencies have increasingly turned to bridge preventive maintenance activities to prolong bridge service lives. These activities ...
  • Fargo Moorhead 2021 Travel Demand Model Update
    Fargo Moorhead 2021 Travel Demand Model Update
    Motuba, Diomo ;
    Faisal, Habib Muhammad
    2023-09-01 | PDF
    The Fargo Moorhead MPO’s (The F-M MPO) Travel Demand Model (TDM) is updated every five years to replicate new data and the advancements in state-of-the-art transportation modeling methods and techniques. The original timeline for the current model was set for 2020. However, due to COVID-19, travel patterns changed because of travel restrictions and ...
  • Impact of Urban Speed Limit Changes on Driving Speeds Technical Summary
    Impact of Urban Speed Limit Changes on Driving Speeds [Technical Summary]
    Davis, Gary A. ;
    Lund, Victor
    2023-09-01 | PDF
    Speed limits are a popular safety measure used in urban areas. A new analysis that monitored driving speeds before and after posted changes to speed limits reveals lower speed limits may not, at least initially, cause drivers to slow down.
  • STAR InRoad Electric Vehicle Charging for Parked Vehicles Fact Sheet
    STAR In-Road Electric Vehicle Charging for Parked Vehicles [Fact Sheet]
    Abdulhamed, Bilal ;
    Alavizadeh, Hootan
    2023-09-01 | PDF
    The global electric vehicle (EV) market is forecasted to grow by 24.3% till 2028 constantly. However, the development in charging infrastructure is still lagging behind that, hindering the EV's widespread application, i.e., 30 million chargers are still needed to support the existing EV demand. Also, based on the survey by Witricity, 86% of EV owne ...
  • Using SeverityWeighted Risk Scores To Prioritize Safety Funding in Utah
    Using Severity-Weighted Risk Scores To Prioritize Safety Funding in Utah
    Schultz, Grant G. ;
    Aristizabal, Tomas Barriga
    2023-09-01 | PDF
    Budgets for transportation improvements are limited so it is important for governments to focus on improving locations most in need of safety funding. The objective of the Two-Output Model for Safety (TOMS) is to provide the Utah Department of Transportation (UDOT) with a reliable method to prioritize safety improvements on state-owned roadways amo ...
  • Snowplow Route Optimization for the Kansas Roadway System
    Snowplow Route Optimization for the Kansas Roadway System
    Tran, Dan ;
    Nguyen, Phuong
    2023-09-01 | PDF
    State departments of transportation (DOTs) spend substantial resources on snow and ice control activities and operations each year. The Kansas DOT (KDOT) spends from $7 million to $22 million annually. KDOT winter maintenance operations currently deploy a fleet of 591 snowplow trucks, including 1,182 drivers and approximately 200 engineering techni ...
  • Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Saadeh, Shadi ;
    El Asmar, Maria
    2023-09-01 | PDF
    Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) ...
  • Traffic Safety Facts 2021 Data 2021 State Traffic Data
    Traffic Safety Facts 2021 Data: 2021 State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-09-01 | PDF
    Traffic fatalities in the United States increased by 10 percent from 2020 to 2021 (39,007 to 42,939). The fatality rate per 100 million vehicle miles traveled (VMT) was 1.37 in 2021, ranging from a high of 2.08 to a low of 0.71 among States. The rate of traffic fatalities per 100 million VMT in the United States increased by 2 percent (1.34 to 1.37 ...
  • Enhancing Freeway Safety Prediction Models Technical Report
    Enhancing Freeway Safety Prediction Models: Technical Report
    Pratt, Michael P. ;
    Geedipally, Srinivas R.
    2023-09-01 | PDF
    Safety prediction models have been developed for urban freeway segments in Texas and elsewhere to apply to cross sections up to 10 lanes wide. These models are documented resources such as TxDOT’s Roadway Safety Design Workbook and the Highway Safety Manual and applied in several spreadsheet-based analysis tools. These tools are acknowledged in the ...
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