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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 341 - 360 of 36054 results
  • Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Diefenderfer, Brian K ;
    Nair, Harikrishnan
    2025-07-01 | PDF
    During asphalt pavement construction, obtaining adequate and uniform density throughout the pavement layer through the compaction process is critical to achieving the desired performance. Optimum pavement density reduces oxidation potential and moisture damage, decreases rutting potential, and improves fatigue life. Numerous national research proje ...
  • Crash Modification Factors for Super 2 Highways
    Crash Modification Factors for Super 2 Highways
    Brewer, Marcus A. ;
    Geedipally, Srinivas R.
    2025-07-01 | PDF
    Super 2 highways have been used across Texas for over 20 years, providing operational and safety benefits to rural two-lane highways at a lower cost than widening such facilities to four lanes. More Super 2 highways are planned as the demand increases on the state highway system. Previous research has provided insights on Super 2 safety, but update ...
  • Mitigation of Cybersecurity Vulnerabilities for Traffic Control Infrastructure
    Mitigation of Cybersecurity Vulnerabilities for Traffic Control Infrastructure
    Kourtellis, Achilleas ;
    Lin, Pei-Sung
    2025-07-01 | PDF
    As transportation systems incorporate computing technology, cybersecurity risks have grown. This project, in collaboration with the Florida Department of Transportation (FDOT) and the Traffic Engineering Research Laboratory (TERL), aims to enhance the security of traffic controllers and related infrastructure by identifying vulnerabilities, develop ...
  • The Service and Ultimate Behavior of BenttoColumn Joints in TxDOT Substructures
    The Service and Ultimate Behavior of Bent-to-Column Joints in TxDOT Substructures
    Wang, Hwa-Ching ;
    Briscoe, Terence J.
    2025-07-01 | PDF
    This research examined the service and ultimate behavior of bridge bent-to-column connections in Texas Department of Transportation (TxDOT) substructures to develop design recommendations for improved structural resilience under extreme events, including flooding, vehicular collision, and loss of column. A three-phase approach was employed. First, ...
  • Human Factors Study to Understand Driver Behavior on Managed Lane Facilities
    Human Factors Study to Understand Driver Behavior on Managed Lane Facilities
    Alluri, Priyanka ;
    Abou-Senna, Hatem
    2025-07-01 | PDF
    The Florida Department of Transportation (FDOT) has several managed lane facilities throughout the state. Managed lanes (MLs) are commonly constructed adjacent to general-purpose lanes (GPLs) to improve mobility. The objective of this research was to understand driver behavior on managed lane facilities, specifically pertaining to the type of separ ...
  • Development of Incident Management Performance Measures Database and Supporting Training Material Summary
    Development of Incident Management Performance Measures Database and Supporting Training Material [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2025-07-01 | PDF
    Secondary crashes resulting from traffic queues are a significant national safety concern. Traffic Incident Management (TIM), which involves coordinated multi-agency response to roadway incidents, is widely recognized as an effective approach to mitigating these crashes. This study aimed to develop a library of after-action case studies to support ...
  • Data Infographics for CTfastrak and the Hartford Line Survey
    Data Infographics for CTfastrak and the Hartford Line Survey
    Cohen, Jeffrey P ;
    Zhou, Songyang
    2025-06-30 | PDF
    This report examines some of the economic and real estate impacts of Connecticut’s CTfastrak and Hartford Line transit systems through a multi-phase, data-driven study. Findings reveal evidence that proximity to transit stations is associated with increased property values, higher property tax revenues, reduced residential and commercial vacancies, ...
  • Engineering Countermeasures to Mitigate Reckless Driving Behavior
    Engineering Countermeasures to Mitigate Reckless Driving Behavior
    Guler, S. Ilgin ;
    Gayah, Vikash V.
    2025-06-24 | PDF
    This project aimed to enhance understanding of the role of reckless driving in traffic safety on Wisconsin roadways and to identify effective countermeasures to mitigate its impact. Reckless driving was defined as crashes involving the following four behaviors: speeding, distracted/drowsy driving, impaired, and aggressive driving. The research bega ...
  • Automated Record Keeping for Maintenance Operations via Tracking of Maintenance Vehicles Using Telematics Tracks
    Automated Record Keeping for Maintenance Operations via Tracking of Maintenance Vehicles Using Telematics Tracks
    Naman, Anugunj ;
    Zhang, Yaguang
    2025-06-24 | PDF
    Efficient and accurate record-keeping for maintenance vehicle operations is essential for optimizing resources, improving accountability, and enhancing decision-making for transportation agencies. The Indiana Department of Transportation (INDOT) sought an automated system to verify and improve work order records using telematics-based vehicle track ...
  • Efficacy of Speed Warning Technologies
    Efficacy of Speed Warning Technologies
    Gates, Timothy J. ;
    Cavka, Magdalena
    2025-06-10 | PDF
    Research was undertaken to determine the effectiveness of various speed warning technologies across a variety of critical speed-change contexts in order to provide guidance to support future installation and operation of such treatments in Michigan. The speed warning technologies evaluated in this research included dynamic speed feedback signs (DSF ...
  • Research and Development of a 3Item Transportation Security Index Mobility Measurement Tool
    Research and Development of a 3-Item Transportation Security Index Mobility Measurement Tool
    Murphy, Alexandra K ;
    Griffin, Jamie
    2025-06-05 | PDF
    Departments of Transportation need measurement tools to (1) assess and track over time populations and geographies where mobility investments are needed, (2) assess what is driving the mobility needs of different populations and geographies so as to identify possible interventions, and (3) evaluate the impact of department investments on mobility. ...
  • Project Summary Machine Vision for Asset Management
    Project Summary: Machine Vision for Asset Management
    Minnesota. Department of Transportation
    2025-06-02 | PDF
    This project investigated the use of evolving machine vision technologies to improve asset management procedures. Machine vision is technology that enables machines to “see” and interpret images, similar to how humans see and understand the world. It includes capturing an image, analyzing the image, and then completing and action or decision based ...
  • HazardBased Risk and CostBenefit Assessment of Temporary Bridges in California
    Hazard-Based Risk and Cost-Benefit Assessment of Temporary Bridges in California
    Petrone, Floriana ;
    Kunnath, Sashi K.
    2025-06-02 | PDF
    Temporary bridges are systems designed for an expected service life of 5 years. In 2011, the California Department of Transportation issued a memo to designers advocating the use of design spectra corresponding to a return period of 100 years for temporary bridges. However, broad consensus on the most appropriate hazard level and design approach is ...
  • Unmanned Aerial Systems for Determining Vegetative Establishment on ALDOT Construction Sites
    Unmanned Aerial Systems for Determining Vegetative Establishment on ALDOT Construction Sites
    Singh, Puranjit ;
    Bao, Yin
    2025-06-02 | PDF
    Roadside vegetation composition assessment is essential to maintain ecological stability, control invasive species, and to ensure the adoption of environmental regulations around construction zones. Traditional monitoring methods involving visual inspections are time-consuming, labor-intensive, and not scalable. Remote sensing offers a valuable alt ...
  • Development of a Health and Wellness Assessment for KYTC Personnel
    Development of a Health and Wellness Assessment for KYTC Personnel
    Dadi, Gabriel B. ;
    Taherpour, Farshid
    2025-06-01 | PDF
    Highway construction workers operate in high-stress, hazardous settings where they have to perform physically taxing labor in environments where exposure to variable weather conditions, heavy equipment, high volumes of vehicle traffic, and other conditions that induce stress and anxiety are the norm. Up to 70% of workers in this industry have repor ...
  • Evaluation of Corrugated Pipes Manufactured with Recycled Materials Research Summary
    Evaluation of Corrugated Pipes Manufactured with Recycled Materials [Research Summary]
    Pluimer, Michael ;
    Brenna, Erik
    2025-06-01 | PDF
    This Research Summary is part of the final deliverable for Report 2025-32, "Evaluation of Corrugated Pipes Manufactured with Recycled Materials."
  • Enhancing Safety for Pedestrians and Bicyclists at Roundabouts Research Summary
    Enhancing Safety for Pedestrians and Bicyclists at Roundabouts [Research Summary]
    Savolainen, Peter T. ;
    Wagner, Mark
    2025-06-01 | PDF
    Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr ...
  • Assessment of LongTerm Performance of Louisiana Asphalt Pavements
    Assessment of Long-Term Performance of Louisiana Asphalt Pavements
    Mohammad, Louay N. ;
    Akentuna, Moses
    2025-06-01 | PDF
    This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance ...
  • Identify Best Locations for New FlexRoute Projects Throughout the State of Michigan
    Identify Best Locations for New Flex-Route Projects Throughout the State of Michigan
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2025-06-01 | PDF
    Part-time shoulder use (PTSU) has emerged as an effective lane-use strategy to mitigate both recurrent and non-recurrent congestion. Given the operational and safety benefits associated with the US-23 Flex Route, this research project focused on evaluating the feasibility of PTSU on selected freeway corridors in Michigan that are prone to such cong ...
  • Sustaining Performance of ASRAffected Pavements Effective Practices and Insights
    Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights
    Bektas, Fatih
    2025-06-01 | PDF
    Alkali-silica reaction (ASR) remains a significant durability concern in concrete pavements, leading to internal cracking, surface deterioration, and loss of ride quality. Although preventive measures have reduced ASR in new construction, pavements built in Minnesota in the 1980s and 1990s continue to exhibit distress. This study evaluates maintena ...
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