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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 3101 - 3120 of 35959 results
  • InService Assessment of Road Sinkholes With 2D Ambient Noise Tomography
    In-Service Assessment of Road Sinkholes With 2D Ambient Noise Tomography
    Tran, Khiem ;
    Wang, Yao
    2021-11-01 | PDF
    Seismic methods are often used for detection of pre-collapsed sinkholes (voids) under roadway for remediation to minimize the risk to the safety of the traveling public. While the active-source seismic methods can provide accurate subsurface profiles, they require closing the traffic flow for hours during testing and potentially cause sinkhole coll ...
  • Assessing Culverts in Minnesota Fish Passage and Storm Vulnerability
    Assessing Culverts in Minnesota: Fish Passage and Storm Vulnerability
    Kozarek, Jessica ;
    Herb, William
    2021-11-01 | PDF
    Culverts at road-stream crossings can create barriers to movement within a stream network that can have dramatic consequences for fish populations by fragmenting habitat. Culverts can become barriers when flow conditions exceed fish swimming ability, e.g., for drop at the outlet and insufficient depth or excess flow velocity. In this project, we us ...
  • MASH Validation Testing of Low Profile Barrier
    MASH Validation Testing of Low Profile Barrier
    Consolazio, Gary R. ;
    Gurley, Kurtis R
    2021-11-01 | PDF
    The Florida low profile barrier—consisting of multiple interconnected portable concrete segments—is typically utilized in construction zones to separate traffic from construction activities. The original development and validation (crash testing) of the barrier were in accordance with applicable standards at the time (NCHRP Report 350). In the pres ...
  • The Development of Intermodal Freight Transport in Poland from 2007 to 2016 Barriers and Opportunities to Its Further Development
    The Development of Intermodal Freight Transport in Poland from 2007 to 2016: Barriers and Opportunities to Its Further Development
    Monka, Dominika ;
    Pyne, Robyn
    2021-11-01 | PDF
    International transport has grown dynamically in Poland since it becomes a European Union (EU) member. This being the case, it is now, more than ever, important to identify the approaches that are most suitable for delivering sustainable freight transport to the nation. Intermodal options appear to be the most appropriate for this task. This study ...
  • Quality ControlAssurance on Base Course and Embankment With the Dynamic Cone Penetrometer
    Quality Control/Assurance on Base Course and Embankment With the Dynamic Cone Penetrometer
    Ferguson, Nicholas ;
    Gautreau, Gavin
    2021-11-01 | PDF
    Nuclear moisture-density gauges (NDG) operate with the use of radioactive materials that may be hazardous to the health of the operators under certain circumstances. There is a need for test procedures using devices that are accurate, easy-to-use, economically sound, and nonradioactive. This research investigated using the Dynamic Cone Penetrometer ...
  • Alternate Interchange Signing Study for Indiana Highways
    Alternate Interchange Signing Study for Indiana Highways
    Chen, Stanley ;
    Chen, Yaobin
    2021-11-01 | PDF
    The main objectives of this research were to (1) understand signing issues from the perspective of drivers and (2) develop recommendations for improving interchange signing in Indiana to aid driver understanding and increase the safety and efficiency of highway traffic operations. An online survey with specific questions was designed and distribute ...
  • Evaluation of Open Graded Friction Courses Construction Maintenance and Performance Phase II
    Evaluation of Open Graded Friction Courses: Construction, Maintenance, and Performance Phase II
    Putman, Bradley J. ;
    Danish, Behrooz
    2021-11-01 | PDF
    This study investigated multiple factors that influence the performance of open graded friction courses (OGFC) in South Carolina with the ultimate goal of improving the long-term durability and performance of OGFCs. The research included laboratory studies to evaluate the influence of aggregate Los Angeles (LA) Abrasion and breakdown, aggregate gra ...
  • Ohios Research Initiative for Locals ORIL Research OnCall 2021ORIL6 Task 2 Current Practices and Experience for Using Chip Seal Interlayer by Ohio Local Public Agencies To Mitigate Reflection Cracking
    Ohio’s Research Initiative for Locals (ORIL) Research On-Call 2021-ORIL6 (Task 2): Current Practices and Experience for Using Chip Seal Interlayer by Ohio Local Public Agencies To Mitigate Reflection Cracking
    Nazzal, Munir D ;
    Swaleh, Safaa
    2021-11-01 | PDF
    This report summarizes the results of a research task that was conducted to identify the current state of the practice of local public agencies (LPAs) for using chip seal interlayer (CSI) to control or reduce reflection cracking of overlay and summarize the results of different studies on the use chip seal interlayer. To achieve these objectives a ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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