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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 4241 - 4260 of 36011 results
  • MASH TL3 Evaluation of TxDOT ExtraLarge Mailboxes
    MASH TL-3 Evaluation of TxDOT Extra-Large Mailboxes
    Dobrovolny, Chiara Silvestri ;
    Bligh, Roger P.
    2020-10-01 | PDF
    The purpose of the testing reported herein was to assess the performance of Texas Department of Transportation's (TxDOT’s) extra-large mailboxes 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) for Test Le ...
  • Use of Geophysical Methods for Sinkhole Exploration
    Use of Geophysical Methods for Sinkhole Exploration
    Montgomery, Jack ;
    Jackson, Dan
    2020-10-01 | PDF
    Karst geology is characterized by the presence of sinkholes and voids, which may pose significant risk to existing infrastructure. Sinkhole formation is often observed near active quarries, where dewatering operations can alter regional groundwater flow patterns leading to subsidence and increased void formation. In these areas, identifying locatio ...
  • MASH TL3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge or Culvert Structure
    MASH TL-3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge or Culvert Structure
    Williams, William F. ;
    Abu-Odeh, Akram Y.
    2020-10-01 | PDF
    Texas Transportation Institute (TTI) researchers performed an extensive literature review of bridge railing transitions crash tested to Manual for Assessing Safety Hardware (MASH) TL-3, and incorporated the information obtained from this review into the design and details for the new transition testing developed for this project. TTI researchers de ...
  • Rubber Asphalt Study for Wisconsin
    Rubber Asphalt Study for Wisconsin
    Reichelt, Signe ;
    Kilger, Albert
    2020-10-01 | PDF
    This study investigated the usage of ground tire rubber (GTR) in Wisconsin asphalt pavements. A special provision (SPV) was drafted outlining mix design guidance when using terminal and dry process GTR. The SPV also included a performance testing regime including Hamburg Wheel Tracking, Disk-Shaped Compact Tension (DCT), and Illinois Flexibility In ...
  • Hydraulic Effects of Temporary Bridge Construction Activities
    Hydraulic Effects of Temporary Bridge Construction Activities
    Fitzpatrick, Devan ;
    Buggs, Tanner
    2020-10-01 | PDF
    Bridge construction often requires placement of temporary features such as rock jetties and cofferdams in stream and river channels during the construction process. Environmental permitting agencies seek documentation, and in some cases quantification, of the potential effects of these temporary features on instream velocities and channel bank and ...
  • University of Florida Testbed Initiative Transit Components Bus Bike Rack System BDV31977113
    University of Florida Testbed Initiative - Transit Components: Bus Bike Rack System (BDV31-977-113)
    Yoon, Yong-Kyu ;
    Schumann, Todd
    2020-10-01 | PDF
    The Alachua County, FL, has the second highest bicycle mode share in the state. Bicycle riding combined with bus riding, i.e., multimodal commuting, is very popular in the City of Gainesville (COG), FL, while quantified information of usage is very limited. Although some infrastructure could be upgraded, there is no scientific data and ground to ma ...
  • Bridge Load and Resistance Factor Rating LRFR Assessment Statewide
    Bridge Load and Resistance Factor Rating (LRFR) Assessment – Statewide
    Sivakumar, Bala ;
    Senturk, Ekin
    2020-10-01 | PDF
    This purpose of this project is to validate the draft New York State Department of Transportation Load and Resistance Factor Rating (LRFR) Engineering Instruction developed to provide guidance on application of the LRFR methodology as specified in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Bridge Eval ...
  • Deploy and Test a SmartphoneBased Accessible Traffic Information System for the Visually Impaired
    Deploy and Test a Smartphone-Based Accessible Traffic Information System for the Visually Impaired
    Liao, Chen-Fu ;
    Davis, Brian
    2020-10-01 | PDF
    An increasing number of Accessible Pedestrian Signals (APS) have been installed at new or upgraded intersections to assist people with vision impairment to navigate streets. For un-signalized intersections and intersections without APS, people with vision impairment have to rely on their own orientation and mobility skills to gather necessary infor ...
  • Determine Proper Selection of Ride Quality Pay Adjustment Schedule and ReEvaluation of Current BonusPenalty Structure Technical Report
    Determine Proper Selection of Ride Quality Pay Adjustment Schedule and Re-Evaluation of Current Bonus/Penalty Structure: Technical Report
    Gurganus, Charles ;
    Messhenas, Saber
    2020-10-01 | PDF
    The Texas Department of Transportation (TxDOT) currently uses a guidance document to help select a ride quality pay schedule for paving projects. This guidance is more than 15 years old and was developed without a robust dataset. This project used more than 300 highway projects to categorize paving projects into eight groups. Following categorizati ...
  • LED Street Lighting Implementation Research Support and Testing
    LED Street Lighting Implementation Research, Support, and Testing
    Kramer, Robert
    2020-10-01 | PDF
    This report describes the results of technical analysis, field tests, and laboratory tests that were performed for LED highway lighting options by the Energy Efficiency and Reliability Center (EERC) at Purdue University Northwest for the Indiana Department of Transportation (INDOT). This effort was conducted over the past three years to evaluate an ...
  • Polyester Polymer Concrete for Bridge Deck Overlays
    Polyester Polymer Concrete for Bridge Deck Overlays
    Stevens, Robert J ;
    Guthrie, W Spencer
    2020-10-01 | PDF
    The objectives of this research were to 1) compile a synthesis of information about polyester polymer concrete (PPC) from the literature; 2) conduct a scanning tour to observe PPC construction, inspect in-service PPC overlays, and discuss topics related to PPC; 3) revise the existing Utah Department of Transportation (UDOT) PPC specification; 4) do ...
  • Minnesota Drive Ramps Microsurfacing Experimental Feature PostConstruction Report
    Minnesota Drive Ramps Microsurfacing Experimental Feature Post-Construction Report
    Pavey, Andrew
    2020-10-01 | PDF
    This project applied microsurfacing to 17 different Minnesota Drive ramp locations with varying geometry and traffic volumes during June of 2020. The emulsion formulation used a PG64-34 base binder highly modified with Styrene Butadiene Styrene (SBS) polymer and approximately 10.5% residual binder. This report documents the construction process and ...
    Supporting Files
  • Guides for System To Render ME Traffic Data for Pavement Design Instructors Guide
    Guides for System To Render M-E Traffic Data for Pavement Design: Instructor’s Guide
    Walubita, Lubinda F. ;
    Lee, Sang Ick
    2020-10-01 | PDF
    This guideline is to demonstrate the key findings of Texas Department of Transportation (TxDOT) Project 0-6940 Develop System to Render Mechanistic-Empirical Traffic Data for Pavement Design. It can be used as an instructor guide to provide in-depth understanding of site-specific ME-compatible traffic data for pavement design. The training workshop ...
  • Users Manual and Guides for the ME Traffic Database TDSS
    Users’ Manual and Guides for the M-E Traffic Database (T-DSS)
    Walubita, Lubinda F. ;
    Aldo, Aldo
    2020-10-01 | PDF
    This user’s manual aids users to understand and use the mechanistic-empirical (M-E) traffic data storage system (the T-DSS). The T-DSS is a Microsoft Access data storage system containing the essential outcomes of the project 0-6940 entitled “Develop System to Render Mechanistic Empirical Traffic Data for Pavement Design.” As a supporting material, ...
  • Legal and Permit Loads Evaluation for Indiana Bridges
    Legal and Permit Loads Evaluation for Indiana Bridges
    Kusiak, Chris ;
    Bowman, Mark D.
    2020-10-01 | PDF
    According to federal law, routine commercial vehicles must adhere to certain limits on their load configuration in order to operate legally on interstate highways. However, states may allow for heavier or different load configurations provided that bridges on the state and county highway system are load rated and, if necessary, posted with vehicles ...
  • Domestic Airline Fares Consumer Report Fourth Quarter 2019 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Fourth Quarter 2019 Passenger and Fare Information
    United States. Department of Transportation
    2020-10-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Prototype Bluetooth Low Energy Preemption Proximity Alert System
    Prototype Bluetooth Low Energy Preemption Proximity Alert System
    Zhou, Hongmin “Tracy” ;
    Vickich, Mike
    2020-10-01 | PDF
    This document provides a system overview of the proposed prototype BLE proximity alert system for EV preemption at signalized intersections. It provides information about the existing and the BLE proximity alert enabled preemption systems, the system components and interfaces between them, the planned capabilities, and the system architecture.
  • Golf Carts on Public Roads Literature Review of Legislation and State of the Practice in the United States
    Golf Carts on Public Roads – Literature Review of Legislation and State of the Practice in the United States
    Mitran, Elisabeta ;
    Codjoe, Julius
    2020-10-01 | PDF
    This technical assistance report investigated the laws governing golf carts in the United States. Specifically, the report focused on reviewing literature to document the existing state laws and regulations for golf cart operation on public roads, including Louisiana-specific local laws, and the traffic safety impact of operating golf carts on publ ...
  • Traffic Safety Facts 2020 A Compilation of Motor Vehicle Crash Data
    Traffic Safety Facts 2020: A Compilation of Motor Vehicle Crash Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2020-10-01 | PDF
    In this annual report, Traffic Safety Facts 2020: A Compilation of Motor Vehicle Crash Data, the National Highway Traffic Safety Administration presents descriptive statistics about traffic crashes of all severities, from those that result in property damage to those that result in the loss of human life. Information from three of NHTSA’s primary d ...
  • Implementing the Next Generation of UltraThin Slurry Overlays Technical Report
    Implementing the Next Generation of Ultra-Thin Slurry Overlays: Technical Report
    Scullion, Tom ;
    Estakhri, Cindy
    2020-10-01 | PDF
    In Research Project 0-6615, Use of Fine Graded Asphalt Mixes, a preliminary evaluation was made of the newly developed ultra-thin slurry seal (UTSS). The slurry is a combination of fine aggregates and emulsion that is rapidly sprayed onto the pavement surface. Some issues were raised about durability of the product, but the Texas Department of Tran ...
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