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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 3201 - 3220 of 36151 results
  • Alkali Silica Reactivity ASR Risk Assessment and Mitigation in Tennessee
    Alkali Silica Reactivity (ASR) Risk Assessment and Mitigation in Tennessee
    Abd-Elssamd, Ammar ;
    Ma, Z John
    2021-11-01 | PDF
    Alkali-silica reaction (ASR) is recognized as a major cause of concrete deterioration. Identifying the aggregate reactivity to ASR is one of the most efficient ways for preventing concrete cracking damage in practice. Many aggregates, especially the surface aggregates, used in Tennessee have a relatively high siliceous content (e.g. gravels, silice ...
  • Division of Operations Research OnCall Task 2 Evaluation of the Effects of Wind Loads on Flexible Backplates
    Division of Operations Research On-Call Task #2 - Evaluation of the Effects of Wind Loads on Flexible Backplates
    Swanson, James A. ;
    Rassati, Gian Andrea
    2021-11-01 | PDF
    Retroreflective backplates for traffic signals have a proven record of reducing traffic accidents and, currently, all new traffic signals are designed with backplates. While including backplates in the design of new signals and support structures is straightforward, adding backplates to existing signals can be problematic as doing so increases wind ...
  • Analytic Hierarchy Process in the Function of Evaluation of Transport Service Quality in Bus Company
    Analytic Hierarchy Process in the Function of Evaluation of Transport Service Quality in Bus Company
    Bubalo, Tomislav ;
    Rajsman, Marijan
    2021-11-01 | PDF
    Evaluating the competitiveness of bus operators is an important way of promoting the efficiency of transport and quality of transport services. Such evaluation is the scientific basis for decision-making related to the choice of transport company’s development strategy in accordance with vision and set goals. The problem thus posed is the subject o ...
  • Characterization of Blow Over Risk in the Wyoming Highway System
    Characterization of Blow Over Risk in the Wyoming Highway System
    Ohara, Noriaki ;
    Neupane, Adarsha
    2021-11-01 | PDF
    Blow over crashes caused by severe crosswinds are a common problem on Wyoming highways, as well as roadways elsewhere that are subject to high wind conditions. To characterize blow over-inducing wind gusts, a high-frequency wind monitoring system was installed at a known hazard area along Interstate 25 just north of the Colorado-Wyoming state line. ...
  • Heavy Fleet and Facilities Optimization
    Heavy Fleet and Facilities Optimization
    Iyer, Ananth V ;
    Labi, Samuel
    2021-11-01 | PDF
    The Indiana Department of Transportation (INDOT) is responsible for timely clearance of snow on state-maintained highways in Indiana as part of its wintertime operations. For this and other maintenance purposes, the state’s subdistricts maintain 101 administrative units spread throughout the state. These units are staffed by personnel, including sn ...
  • Implementation of Unmanned Aerial SystemBased UAS Digital Photogrammetry for Design Risk Analysis and Hazard Mitigation of Rock Slopes
    Implementation of Unmanned Aerial System-Based (UAS) Digital Photogrammetry for Design, Risk Analysis, and Hazard Mitigation of Rock Slopes
    Watts, Chester F ;
    McClellan, Elizabeth A
    2021-11-01 | PDF
    This study examined whether the deployment of unmanned aerial vehicles, using photogrammetry and 3D modeling software, could provide rock slope design and remediation recommendations comparable to traditional geologic structure mapping methods using handheld transit compasses and measuring tapes. The authors found that the unmanned aerial systems m ...
  • Optimizing Continuous Friction Testing on LowSpeed Roads and in Tight Curves
    Optimizing Continuous Friction Testing on Low-Speed Roads and in Tight Curves
    Bilbee, Michael ;
    Mandokhot, Mohit
    2021-11-01 | PDF
    ODOT proposed a research project to identify a Continuous Friction Measuring Equipment (CFME) device that could be used on Low-speed Roads and Tight curve scenarios, to assess the possibility of measuring available wet friction in areas of their roadway network where LWFT was not previously used. Finding a CFME device that uses the same tires at th ...
  • Evaluation of Guardrail Performance in HighRisk Accident Zones on Georgia Roadways and Identification of Alternative Barriers
    Evaluation of Guardrail Performance in High-Risk Accident Zones on Georgia Roadways and Identification of Alternative Barriers
    Yang, Xiaoming ;
    Krenek, Russel
    2021-11-01 | PDF
    W-beam guardrail systems are the predominant roadside safety barrier used on Georgia highways. These systems are usually installed in accordance with guidelines for the Midwest Guardrail System and generally perform very well across the state. However, in certain areas of high traffic volume in Georgia, repetitive accident locations may benefit fro ...
  • TScanStationary LiDAR for Traffic and Safety Applications Vehicle Interpretation and Tracking
    TScan–Stationary LiDAR for Traffic and Safety Applications: Vehicle Interpretation and Tracking
    Tarko, Andrzej P ;
    Romero, Mario A.
    2021-11-01 | PDF
    To improve traffic performance and safety, the ability to measure traffic accurately and effectively, including motorists and other vulnerable road users, at road intersections is needed. A past study conducted by the Center for Road Safety has demonstrated that it is feasible to detect and track various types of road users using a LiDAR-based syst ...
  • Rating and Inventory of TDOT Retaining Walls
    Rating and Inventory of TDOT Retaining Walls
    Wu, Weidong ;
    Wang, Endong
    2021-11-01 | PDF
    To meet the requirements under the Moving Ahead for Progress in the 21st Century Act (MAP-21), Tennessee Department of Transportation (TDOT) decided to develop a management program covering condition rating, service life prediction and inventory of retaining walls in the State of Tennessee to protect the safety and welfare of the public. This proje ...
  • Traffic Safety Facts 2019 Data RuralUrban Comparison of Motor Vehicle Traffic Fatalities
    Traffic Safety Facts 2019 Data: Rural/Urban Comparison of Motor Vehicle Traffic Fatalities
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2021-11-01 | PDF
    This fact sheet compares rural and urban motor vehicle traffic fatalities for 2019. Of the 36,096 motor vehicle traffic fatalities in 2019 there were 16,340 (45%) that occurred in rural areas, 19,595 (54%) in urban areas, and 161 (less than 0.5%) in areas of unknown land use. Data on the following is presented: crash characteristics, drivers, speed ...
  • Data Analyses from Seismic Instrumentation Installed on the I40 Bridge
    Data Analyses from Seismic Instrumentation Installed on the I-40 Bridge
    Pezeshk, Shahram ;
    Camp, Charles V
    2021-10-31 | PDF
    The Hernando De Soto I-40 Bridge spans over the Mississippi River connecting Tennessee and Arkansas. On May 11, 2021, this bridge was closed after detecting a fraction in one of the major 900-ft horizontal tension tie girders. Inspections conducted by officials from both the Tennessee and Arkansas departments of transportation revealed that the cra ...
  • TransportationRelated Behaviors and Attitudes A Survey of Floridas Aging Road Users
    Transportation-Related Behaviors and Attitudes: A Survey of Florida’s Aging Road Users
    Barrett, Anne ;
    Noblitt, Jessica
    2021-10-31 | PDF
    This project supported the efforts of Florida’s Safe Mobility for Life Coalition (SMFLC) to meet the aims outlined in Florida’s Aging Road User Strategic Safety Plan (ARUSSP), which include increasing aging road users’ safety and mobility. To better understand aging road users’ transportation-related behaviors and attitudes, a statewide online surv ...
  • Accelerating Mix Design for CementTreated Bases Project Summary
    Accelerating Mix Design for Cement-Treated Bases [Project Summary]
    Sebesta, Stephen ;
    Kim, Jinho
    2021-10-31 | PDF
    This project aimed to streamline CTB mixture design with an accelerated process and lab procedures similar to those recently developed for emulsified and foamed asphalt. By employing indirect tensile (IDT) strength from 4-in.- diameter, 2-in.-tall specimens, the accelerated mix design approach can produce results faster and with less material than ...
  • 06973 Predictive Mapping of Rare Plants Project Summary
    0-6973: Predictive Mapping of Rare Plants [Project Summary]
    Kafley, Hemanta ;
    Craven, Jordan
    2021-10-31 | PDF
    0-6973: Predictive Mapping of Rare PlantsRare plants are essential components of a functioning ecosystem. These species are often phenotypically unique or provide a specific ecosystem function. Rare plants may be limited in range, limited in population numbers, or a combination of both. These plants are often imperiled due to a combination of facto ...
  • Air Quality and HealthRelated Impacts of Traditional and Alternate Jet Fuels From Airport Aircraft Operations in the US
    Air Quality and Health-Related Impacts of Traditional and Alternate Jet Fuels From Airport Aircraft Operations in the U.S.
    Arter, Calvin A ;
    Buonocore, Jonathan J
    2021-10-26 | PDF
    Aviation emissions from landing and takeoff operations (LTO) can degrade local and regional air quality leading to adverse health outcomes in populations near airports and downwind. In this study we aim to quantify the air quality and health-related impacts from commercial LTO emissions in the continental U.S. for two recent years’ inventories, 201 ...
  • Exploring the Relationship Between Mandatory Helmet Use Regulations and Adult Cyclists Behavior in California Using Hybrid Machine Learning Models
    Exploring the Relationship Between Mandatory Helmet Use Regulations and Adult Cyclists’ Behavior in California Using Hybrid Machine Learning Models
    Kakhki, Fatemeh Davoudi ;
    Chierichetti, Maria
    2021-10-01 | PDF
    In 2019, the National Transportation Safety Board recommended the introduction of all-ages helmet law, to reduce fatalities involving cyclists. Even though the benefits of wearing helmets in protecting cyclists against trauma in cycling crashes has been documented, the use of helmets is still limited, and there is opposition against mandatory helme ...
  • Synthesis Bridge Deck Drains
    Synthesis: Bridge Deck Drains
    Shahandashti, Mohsen ;
    Chao, Shih-Ho (Simon)
    2021-10-01 | PDF
    Bridge deck drains are an integral component of bridges helping in the removal of runoff. The debris carried by the runoff clog drains frequently. The objective of this project is to synthesize and evaluate existing bridge deck drains and provide recommendations for the design, construction, and maintenance of bridge deck drains. The research findi ...
  • Examining the Impact of TransportationRelated Barriers on SelfPerceived Physical Health Among Adults in the United States
    Examining the Impact of Transportation-Related Barriers on Self-Perceived Physical Health Among Adults in the United States
    Baiden, Philip ;
    Boateng, Godfred O
    2021-10-01 | PDF
    Objective: Drawing from the framework of social determinants of health, the objective of this paper was to investigate the cross-sectional association between transportation-related factors and self-perceived physical health among adults in the U.S. while adjusting for known demographic and socioeconomic-related factors. Methods: Data for this repo ...
  • Precision Statistics
    Precision Statistics
    Taylor, Ross ;
    Sebesta, Stephen
    2021-10-01 | PDF
    Understanding the precision of a test method is important to aid in evaluating the expected level of agreement in test results on like materials when performed either in a single lab or across multiple labs. Every test will be subject to some level of random errors; additionally, systematic factors or other factors impacting the test result could e ...
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