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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 3241 - 3260 of 35958 results
  • Estimating AADT on NonCoverage Roads
    Estimating AADT on Non-Coverage Roads
    Huynh, Nathan ;
    Wang, Jing
    2021-09-01 | PDF
    This project developed several models to obtain accurate estimates of annual average daily traffic (AADT) at non-coverage locations. The developed models include kriging, regression and point-based. The standard kriging approach is modified in this project to use a default value when its predicted value is over a user-specified threshold (referred ...
  • Develop Rapid Quality Control and Assurance Technologies for Pavements Phase II Report
    Develop Rapid Quality Control and Assurance Technologies for Pavements: Phase II Report
    Crockford, Bill ;
    Deng, Yong
    2021-09-01 | PDF
    This project expanded on the technology readiness of three non-destructive tools for potentially enhancing quality inspection, asset management, or forensic investigations in flexible pavements. These tools included mechanics-based models for base course, compaction monitoring system (CMS) for asphalt mixture process control, and ground penetrating ...
  • Snow and Ice Treatment Products Evaluation
    Snow and Ice Treatment Products Evaluation
    Liu, Jenny ;
    Liu, Jun
    2021-09-01 | PDF
    The Missouri Department of Transportation (MoDOT) Maintenance Division uses different materials to reduce the negative impact of snow and ice on the friction performance of state travelways. These materials include abrasives (sand or cinders), rock salt (sodium chloride), and other chemical deicers that emerged in recent years. The use of chemicals ...
  • Assessment of Washington State Bridges for PostEarthquake Mobility and Recovery Planning
    Assessment of Washington State Bridges for Post-Earthquake Mobility and Recovery Planning
    Phillips, Adam R. ;
    Motter, Christopher J
    2021-09-01 | PDF
    A 2019 Department of Homeland Security report assessing the regional resiliency of Western Washington state to a Cascadia Subduction Zone earthquake predicted widespread and high levels of bridge damage. Because of this report, the state’s emergency response and recovery plan is heavily reliant on air transportation modes to provide resources to th ...
  • Machine Learningbased Trajectory Optimization of Connected and Autonomous Vehicles
    Machine Learning-based Trajectory Optimization of Connected and Autonomous Vehicles
    Fan, Wei (David) ;
    Liu, Pengfei
    2021-09-01 | PDF
    Connected and autonomous vehicle (CAV) technologies provide solutions to the existing problems of the transportation systems. As widely known, CAVs can communicate with each other so that they can have coordinated accelerating or decelerating movements. In this manner, CAVs only need a smaller headway which will lead to a higher roadway capacity. F ...
  • Estimation of Pedestrian Volume Using Geospatial and Traffic Conflict Data
    Estimation of Pedestrian Volume Using Geospatial and Traffic Conflict Data
    Ivan, John N. ;
    Burnicki, Amy
    2021-09-01 | PDF
    No Description
  • Exploring the Impact of Infrastructure on Bike Sharing System Performance in Houston City
    Exploring the Impact of Infrastructure on Bike Sharing System Performance in Houston City
    Azimi, Mehdi ;
    Zhou, Lijie
    2021-09-01 | PDF
    No Description
  • Analysis of the Quality of Stormwater Runoff Discharged from Representative Connecticut Highways by USGS Period 1 070118 063019 Revised Period 1 070118 063020 Interim Report
    Analysis of the Quality of Stormwater Runoff Discharged from Representative Connecticut Highways by USGS – Period 1 (07/01/18 – 06/30/19) [Revised Period 1 (07/01/18 – 06/30/20)] - Interim Report
    Carifa, Kevin C
    2021-09-01 | PDF
    The overall objective of this project is to document highway runoff and constituent concentrations discharged from common highway-drainage conveyance structures in Connecticut from nine highway sites during two sequential two-year periods in order to fulfill Connecticut Department of Transportation's (CTDOT’s) Municipal Separate Storm Sewer Systems ...
  • Reclaimed Stabilized Base Stabilizing Agent Selection Design Video
    Reclaimed Stabilized Base – Stabilizing Agent Selection & Design [Video]
    Khorasani, Ali
    ORCID ICON IMG
    2021-09-01 | HTML
    Reclaimed stabilized base (RSB) is a common technique utilized to rehabilitate roadways. RSB involves reclaiming the base material and adding a stabilizing agent to increase the strength and durability of the base/subbase structure. This technique involves pulverizing some of the existing pavement along with a portion of the underlying base materia ...
  • Evaluating the Impact of Vehicle Digital Communication Alerts on Vehicles
    Evaluating the Impact of Vehicle Digital Communication Alerts on Vehicles
    Sakhare, Rahul Suryakant ;
    Desai, Jairaj
    2021-09-01 | PDF
    Traditional methods for communicating the presence of maintenance activities and work zones have been done with a variety of fixed signs. The increase of in-vehicle connectivity on roads—either directly integrated into the vehicle or via an application running on a mobile phone–provides an opportunity for additional communication to motorists about ...
  • North Carolina Highway Cost Allocation and Revenue Attribution Study
    North Carolina Highway Cost Allocation and Revenue Attribution Study
    Hasnat, Md Mehedi ;
    Bardaka, Eleni
    2021-09-01 | PDF
    The objective of this research is to estimate and compare the highway infrastructure cost responsibility and revenue contribution of highway users in North Carolina. The study adopted the FHWA 13 vehicle classification system and analyzed data on highway infrastructure expenditures and federal and state revenue for the years 2014-2017. The results ...
  • AlkaliSilica Reactivity in the State of Montana
    Alkali-Silica Reactivity in the State of Montana
    Siegner, Ashton ;
    Berry, Michael
    2021-09-01 | PDF
    The primary objective of this research was to evaluate the potential for deleterious Alkali Silica Reactivity (ASR) in the state of Montana. In connection with this goal, (1) a literature review was conducted to summarize the ASR practices used by various state departments of transportation, as well as several federal agencies, (2) potential cases ...
  • Evaluating Mobility Impacts of Construction Workzones on Utah Transportation System Using Machine Learning Techniques
    Evaluating Mobility Impacts of Construction Workzones on Utah Transportation System Using Machine Learning Techniques
    Mashhadi, Ali Hassandokht ;
    Rashidi, Abbas
    2021-09-01 | PDF
    Construction work zones are inevitable parts of daily operations at roadway systems. They have a significant impact on traffic conditions and the mobility of roadway systems. The traffic impacts of work zones could significantly vary due to several interacting factors such as work zone factors (work zone location and layout, length of the closure, ...
  • Mash Test 512 Evaluation of TxDOT T80SS Barrier With Soundwall
    Mash Test 5–12 Evaluation of TxDOT T80SS Barrier With Soundwall
    Bligh, Roger P. ;
    Menges, Wanda L.
    2021-09-01 | PDF
    The purpose of the test reported herein was to assess the performance of the Texas Department of Transportation (TxDOT) T80SS barrier with soundwall according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH). The cr ...
  • Research Library Action Plan Technical Brief
    Research Library Action Plan [Technical Brief]
    Faron, Whitney ;
    Lamm, Christopher
    2021-09-01 | PDF
    The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics (CS) to assist with the development of an action plan that will be used to transform and modernize their Research Library.
  • InStream Structures Integrity and Channel Stability Survey and Evaluation
    In-Stream Structures Integrity and Channel Stability Survey and Evaluation
    Vogel, Jason ;
    Kuster, Adella
    2021-09-01 | PDF
    Streambank erosion can damage bridges, hydraulic structures, and private property. In-stream structures may be installed to control river migration and limit bank erosion during large precipitation events. Historically, the structures most widely used by the Oklahoma Department of Transportation include Kellner jetties, rip rap, pile diversions, an ...
  • Development of Congestion Factors for Adjusting Traffic Counts during Congested Periods Phase 1 Literature Review and Survey
    Development of Congestion Factors for Adjusting Traffic Counts during Congested Periods: Phase 1 – Literature Review and Survey
    Moses, Ren ;
    Masaki, Jaqueline
    2021-09-01 | PDF
    The inductive loop detectors (ILDs) have been used for many decades to monitor traffic on highways. They have proven to be highly reliable in collecting traffic volumes, traffic speeds, vehicle classes, and a slew of other important traffic variables. Traffic monitoring stations that utilize ILDs are generally installed at highway locations far awa ...
  • Best Practices for Cost Recovery
    Best Practices for Cost Recovery
    Plotnikov, Michael
    2021-09-01 | PDF
    The Massachusetts Department of Transportation (MassDOT) Highway Division amended and reissued its Cost Recovery Procedure in 2017. Overall, the procedure has been successful; however, there is still room for improvement, including earlier participation of design consultants in addressing conflicts and discrepancies that result in construction chan ...
  • Development of an UltraAccelerated Test to Evaluate ASR Potential in Concrete Data Management Plan
    Development of an Ultra-Accelerated Test to Evaluate ASR Potential in Concrete: Data Management Plan
    Tanner, Jennifer E.
    2021-09-01 | PDF
    The purpose of this research project is to: Evaluate an ultra-rapid assessment for screening aggregates to determine their reactivity when subject to alkali-silica reaction (ASR). The most reliable test method takes a full year and two years when considering mitigation using supplementary cementitious materials such as fly ash. This rapid screening ...
  • Improved Load Rating Procedures for Deteriorated Steel Beam Ends with Deteriorated Stiffeners
    Improved Load Rating Procedures for Deteriorated Steel Beam Ends with Deteriorated Stiffeners
    Gerasimidis, Simos ;
    Breña, Sergio
    2021-09-01 | PDF
    This study aims to provide evaluation policies for the bearing capacity assessment of plate girders with corroded ends. The developed methodology was organized in three phases that each employed real corrosion data. First, inspection reports of bridges with corrosion-induced damage were processed to quantify the shape and bounds of the most common ...
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