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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 2821 - 2840 of 36873 results
  • Work Zone Speed Limits and Motorist Compliance
    Work Zone Speed Limits and Motorist Compliance
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2022-10-01 | PDF
    This study sought to identify best practices for setting work zone speed limits by state departments of transportation (DOTs) and to evaluate select strategies for improving compliance with work zone speed limits. This was achieved by synthesizing information from a literature review, a state DOT survey, and field evaluations of select speed manage ...
  • Developing Guidelines for Precoating of Aggregates Used in Seal Coats Report
    Developing Guidelines for Precoating of Aggregates Used in Seal Coats [Report]
    Lopez, Erica ;
    Rung, Michael
    2022-10-01 | PDF
    Seal coats in Texas are unique because most binder is hot applied, and aggregates are precoated. Precoating eliminates dust and improves adhesion between aggregate and binder. There currently exists no guidelines or specifications in place that can allow engineers to specify and accept the quality and extent of binder used to precoat aggregates. Pr ...
  • Synthesis of Automated Pedestrian Data Collection Technologies Report
    Synthesis of Automated Pedestrian Data Collection Technologies [Report]
    Haddad, Angela ;
    Macias, Lisa
    2022-10-01 | PDF
    Through academic research and direct communications with transportation agencies, this project surveys new roadside technologies that can assist in efforts for detecting pedestrians. Reasons for using such technologies include traffic operations enhancements, safety improvements, planning, benchmarking, and eventual connected vehicle integrations. ...
  • Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Sylcott, Brian
    2022-10-01 | PDF
    A 2014 change in vehicle appearance guidelines forwent custom bright yellow paint job in favor of the factory standard white color for NCDOT light duty trucks. This change raised some concerns about vehicle conspicuity, or the vehicle’s ability to draw attention to itself. The addition of high visibility markings was offered as a possible solution. ...
  • Hightension Cable Median Barrier Safety Effectiveness Evaluation
    High-tension Cable Median Barrier Safety Effectiveness Evaluation
    Storm, Richard ;
    Srinivasan, Raghavan
    2022-10-01 | PDF
    The objective of this study was to evaluate the change in crash frequency or severity of varying lateral offset distances of high-tension cable median barriers in Minnesota. Crash and traffic data from 2016 to present were conjoined with roadway cross-sectional data and high-tension cable barrier locations to perform cross-sectional analyses for in ...
  • Evaluation of NonSBS Modified Binders Using the Multiple Stress Creep Recovery Test
    Evaluation of Non-SBS Modified Binders Using the Multiple Stress Creep Recovery Test
    Mata, David ;
    Salari, Saman
    2022-10-01 | PDF
    The Multiple Stress Creep Recovery (MSCR) test can characterize polymer-modified asphalt binders and correlates well with the mixture rutting parameters. The MSCR is able to complement a suite of additional binder tests, namely Dynamic Modulus, Phase Angle, and “PG-Plus” tests. A recently-completed MSCR study conducted by the LTRC recommended that ...
  • Domestic Airline Fares Consumer Report Second Quarter 2022 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Second Quarter 2022 Passenger and Fare Information
    United States. Department of Transportation
    2022-10-01 | 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 ...
  • Utilization of UHPC Bridge Superstructures in Texas Summary
    Utilization of UHPC Bridge Superstructures in Texas [Summary]
    Schwerdt, Tom ;
    Hueste, Mary Beth D.
    2022-10-01 | PDF
    The advanced material properties and superior durability of ultra-high-performance concrete (UHPC) provide an opportunity for significant design and construction benefits for Texas bridges. However, several challenges have slowed the application of UHPC in the precast industry, such as the high cost of proprietary UHPC mixtures, slower production d ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Final Guidebook
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs: Final Guidebook
    Asmussen, Katherine ;
    Mondal, Aupal
    2022-10-01 | PDF
    This guidebook will outline the design, development, and deployment of an SP experiment alongside an entire RP-SP survey to best harness the information provided by respondents on behaviors, attitudes, and reactions to both the future and past, the hypothetical and real. Once the RP-SP survey has been designed and deployed, responses have been coll ...
  • Quantification of Systemic Risk Factors for Pedestrian Safety on North Carolina
    Quantification of Systemic Risk Factors for Pedestrian Safety on North Carolina
    Gayah, Vikash V. ;
    Guler, S. Ilgin
    2022-10-01 | PDF
    Pedestrian safety is a growing concern for transportation planners and safety engineers within North Carolina and across the country. Pedestrians are extremely vulnerable users of the transportation system and are particularly subject to serious injuries and fatalities in the event of a crash. For example, while pedestrians are involved in just 1% ...
  • MASH TL4 Engineering Analyses and Detailing of 36Inch and 42Inch High Median Barriers for DOTD Research Project Capsule 231ST
    MASH TL-4 Engineering Analyses and Detailing of 36-Inch and 42-Inch High Median Barriers for DOTD [Research Project Capsule] [23–1ST]
    Williams, William ;
    Rupnow, Tyson
    2022-10-01 | PDF
    The objectives of this research will be achieved through conducting an engineering strength analysis on the four proposed retrofit designs considered for this project in accordance with AASHTO LRFD Section 13 Specifications for MASH Test Level 4 impact conditions.
  • Design Consistency on Corridors
    Design Consistency on Corridors
    Cunningham, Christopher M. ;
    Chase, R. Thomas
    2022-10-01 | PDF
    Alternative Intersection and Interchange (AII) designs provide an innovative approach to the geometric and control features at intersections. Nevertheless, most of the AII designs have unconventional ways to maneuver through the intersection such as restriction of movements, crossover of traffic to the opposite side of the road, separating left tur ...
  • Impacts to Traffic Behaviour From Queue Warning Truck Current Pilot Project
    Impacts to Traffic Behaviour From Queue Warning Truck: Current Pilot Project
    Sakhare, Rahul Suryakant ;
    Mahlberg, Justin
    2022-10-01 | PDF
    The Indiana Department of Transportation (INDOT) started deploying queue warning trucks ahead of interstate work zonestoalert motorists of queued traffic. Along with visually alerting the motorists, digital alerts were integrated with navigational applications such as Apple Maps, Waze, and the in-vehicle infotainment system of Stellantis vehicles. ...
  • Educating the Public About Distracted Driving and Evaluating DistractionPrevention Technologies
    Educating the Public About Distracted Driving and Evaluating Distraction-Prevention Technologies
    Jeihani, Mansoureh ;
    Javid, Ramina
    2022-10-01 | PDF
    Distracted driving is one of the main causes of injuries and fatalities in the United States. 3,142 people were killed, and 324,000 were injured because of distracted driving in 2020. According to previous studies, cell phone use is one of the main sources of distraction while driving. The percentage of young drivers who never text and drive under ...
  • Developing a Roadmap for Digital Delivery in Iowa Strategic Plan for Digital Delivery
    Developing a Roadmap for Digital Delivery in Iowa [Strategic Plan for Digital Delivery]
    Iowa. Department of Transportation
    2022-10-01 | PDF
    The Iowa Department of Transportation (DOT) uses a wide range of data to support business functions across the enterprise. While data is not always available, accessible, or reliable, it is critical for developing products that meet the needs of the Department’s customers and supporting DOT business operations. The Department recognizes the urgency ...
    Supporting Files
  • ActivityBased Household Travel Survey Through Smartphone Apps in Tennessee
    Activity-Based Household Travel Survey Through Smartphone Apps in Tennessee
    Xie, Mengjun ;
    Wu, Da lei
    2022-10-01 | PDF
    Activity-based household travel surveys (HTS) are one of primary data sources for many research fields at Tennessee Department of Transportation (TDOT). Traditional HTS methods are often costly, time-consuming, less scalable, and difficult to achieve high quality and accuracy. Recent years have witnessed a fast-growing interest in conducting HTS th ...
  • Feasibility Study on Geophysical Methods to Estimate Geotechnical Properties in Louisiana
    Feasibility Study on Geophysical Methods to Estimate Geotechnical Properties in Louisiana
    Ferguson, Nicholas ;
    Gautreau, Gavin
    2022-10-01 | PDF
    Subsurface investigations currently rely on conventional soil borings with the aid of cone penetrometer test (CPT)soundings. However, these geotechnical explorations can be expensive and information is not provided between bore holes. Geophysical methods can aid in providing some information between the boreholes at a lower cost for the Louisiana D ...
  • Investigation of Rural Roadway Departures
    Investigation of Rural Roadway Departures
    Burbidge, Shaunna K. ;
    Anderson, Camille
    2022-10-01 | PDF
    Roadway fatalities are a major priority in the transportation sector. UDOT has noted that fatalities increased in 2020 with the leading cause, by a substantial margin, being rural roadway departures. Knowledge about the specific characteristics of rural roadway departure crashes can help UDOT to develop proper mitigation strategies. This research w ...
  • Development of Crash Modification Factors for Speed Management of Traffic Signal Progression Summary
    Development of Crash Modification Factors for Speed Management of Traffic Signal Progression [Summary]
    Lin, Pei-Sung ;
    El-Urfali, Alan
    2022-10-01 | PDF
    This research project investigated the impacts of traffic signal progression strategy on the safety of pedestrians and bicyclists. The CUTR team used historical (crash, traffic, and roadway) data, cross-sectional study designs, and random parameter negative binomial models to estimate the effects of signal progression design on pedestrian and bicyc ...
  • An Analysis of Virtual Public Engagement in the Transportation Planning Process
    An Analysis of Virtual Public Engagement in the Transportation Planning Process
    Dougald, Lance E ;
    Williams, Eric S
    2022-10-01 | PDF
    Public engagement is an important and required element of the transportation planning process. Since the onset of the COVID-19 pandemic, public engagement has shifted dramatically. Agencies of all sizes accelerated their transition to virtual engagement in 2020 to comply with shelter-in-place orders and social distancing guidelines. Social media an ...
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