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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 41 - 60 of 36841 results
  • Enhancing the Safety of Georgias Senior Drivers and Pedestrians by Analyzing Crash Characteristics and Behavior
    Enhancing the Safety of Georgia's Senior Drivers and Pedestrians by Analyzing Crash Characteristics and Behavior
    Tsai, Yichang (James) ;
    Luo, Shiwei
    2026-07-01 | PDF
    Georgia has triggered the Federal Highway Administration's Older Drivers and Pedestrians Special Rule for two consecutive comparison periods. As a result, the State is required to incorporate strategies addressing senior road user safety into its Strategic Highway Safety Plan. This report responds directly to this requirement. The objective of this ...
  • Alternative High Early Strength Concrete HESC Structural Overlays
    Alternative High Early Strength Concrete (HESC) Structural Overlays
    Ideker, Jason H. ;
    Isgor, O. Burkan
    2026-07-01 | PDF
    The objective of this research project was to identify the obstacles or impediments to successfully and reliably using HESC for structural bridge deck overlays on Oregon bridges and to develop the standards, specifications, processes, and practices necessary to using them on ODOT bridges. Rapid strength gain is a desired property for fast and effic ...
    Supporting Files
  • Modeling Traffic Noise and Light on Natural Landscapes at the State Scale
    Modeling Traffic Noise and Light on Natural Landscapes at the State Scale
    Hodgson, Benjamin ;
    Waetjen, David
    2026-07-01 | PDF
    Anthropogenic noise and light have been shown to impact wildlife behavior, distribution, movement, and population fitness and survival. Traffic noise and light can inhibit wildlife use of areas adjacent to roads, impair wildlife perception of traffic risks, and cause a barrier effect to wildlife occurrence and movement well beyond road edges. A cri ...
  • Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories
    Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories
    Jung, Jaehoon ;
    Olsen, Michael J.
    2026-07-01 | PDF
    Pedestrian crosswalks, bike lanes, and medians are key safety devices in a multi-modal highway network. However, there is no statewide map of these assets' locations and types. Such a map would benefit planning, maintenance, safety assessments, and network analyses for ODOT and its partners. Currently, ODOT collects asset information through site v ...
  • Dignity by Design Public Restrooms as Essential Transportation Infrastructure Public Policy
    Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy]
    Mata, Stacy
    2026-07-01 | PDF
    In the absence of an established mobility hub audit framework, this study developed a prospective audit methodology to evaluate prospective hub locations. Structured site visits documented multimodal transportation connections, amenities, accessibility features, and user supportive infrastructure, including shade, seating, drinking water, public re ...
  • Transit Safety Past the Peak Centering Vulnerable Riders in Mobility Hub Design Policy Brief
    Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief]
    Valente, Luis
    2026-07-01 | PDF
    This project examined the Los Angeles Department of Transportation's Integrated Mobility Hubs (IMH) project to identify design improvements and planning practices and policies that can make transit safer and more accessible after dark.
  • Enhancing PavementEncoded Signages for Precise Driving Automation
    Enhancing Pavement-Encoded Signages for Precise Driving Automation
    Sakulneya, Apidej ;
    Liu, Pengyuan
    2026-07-01 | PDF
    A field study was developed combining an automated driving system (ADS) vehicle and magnetometer-based sensing system to test the detectability, repeatability, and reliability of pavement encoded electromagnetic (EM) strips placed on the surface of concrete and asphalt pavement. The objective was to define the EM strips' patterns, lateral vehicle p ...
  • A Corridor Pilot for Better TrackTime Governance in Indian Railways Policy Brief
    A Corridor Pilot for Better Track-Time Governance in Indian Railways [Policy Brief]
    Shukla, Utsav
    2026-07-01 | PDF
    This study analyzes track allocation as a practical problem of how a busy railway shares limited time on the same track. First, Indian Railways' rules for planning maintenance blocks were reviewed, including the rolling block system and the way line capacity is calculated. This is helpful in understanding how the system is supposed to work on paper ...
  • Understanding Suburban Equestrian Transportation Safety Policy Brief
    Understanding Suburban Equestrian Transportation Safety [Policy Brief]
    Johnson, Milena
    ORCID ICON IMG
    2026-07-01 | PDF
    For this study, a GIS analysis was first conducted to map equestrian communities and their demographics within Council District 7, using brown bin service locations and designated horse keeping zones as proxies for horse populations (Figure 1).To support this analysis, community members participated in mapping exercises to identify their travel rou ...
  • Increasing Asphalt Recycling to Reduce Paving Costs Improve Pavement Longevity and Reduce Environmental Impact
    Increasing Asphalt Recycling to Reduce Paving Costs, Improve Pavement Longevity, and Reduce Environmental Impact
    Sukhija, Mayank ;
    Coleri, Erdem
    2026-07-01 | PDF
    Recycling highway construction materials and minimizing the use of virgin materials can reduce pavement life cycle costs, improve highway network conditions, conserve natural resources, and protect the environment. Although using recycled asphalt pavements (RAP) is beneficial in many aspects, aged binder in RAP gives rise to failure under repeated ...
  • Understanding Aggressive Driving and Ways to Reduce It Phase 2 Engaging Bystanders and Developing Effective Messages
    Understanding Aggressive Driving and Ways to Reduce It, Phase 2: Engaging Bystanders and Developing Effective Messages
    Hanson, Bridget L. ;
    Green, Kelly
    2026-07-01 | PDF
    Aggressive driving is a prevalent traffic safety concern that contributes to crash risk and undermines traffic safety culture. Building on Phase 1 work that defined aggressive driving and identified promising intervention points, this Phase 2 study examined two complementary strategies to reduce aggressive driving: supporting bystanders (i.e., spou ...
  • Benchmarking Study of TDOT D Mixtures for Balanced Mix Design
    Benchmarking Study of TDOT D Mixtures for Balanced Mix Design
    Huang, Baoshan ;
    Zhang, Jingyue
    2026-07-01 | PDF
    This study supported the Tennessee Department of Transportation's implementation of Balanced Mix Design (BMD) for TDOT 411-D dense-graded surface mixtures by developing local benchmarking data, evaluating aging procedures, comparing 6-inch Superpave gyratory-compacted and 4-inch Marshall-compacted specimens, and recommending preliminary performance ...
  • Applying Induced Travel Study in Urban Areas in Tennessee
    Applying Induced Travel Study in Urban Areas in Tennessee
    Antipova, Angela ;
    Mishra, Sabya
    2026-07-01 | PDF
    There is a need to understand how transportation provision affects changes in travel including induced travel. Studies are especially needed in places where the increase in travel is substantial. Current research on induced travel in Tennessee has been largely lacking. Prior studies have often used the instrumental approach to isolate the effect of ...
  • Development of an MLBased Georgia Pavement Structural Condition Evaluation System
    Development of an ML-Based Georgia Pavement Structural Condition Evaluation System
    Tsai, Yichang (James) ;
    Yang, Zhongyu
    2026-07-01 | PDF
    Georgia's aging interstate highway network requires more reliable pavement evaluation to support maintenance and rehabilitation (M&R) planning. Current network-level practices rely primarily on surface condition data, which can lead to project-level cost overruns when structural deficiencies are discovered only after budgets have been defined from ...
  • Evaluation of Steel Bridge Girders Damaged by OverHeight Vehicle Strikes Using Terrestrial Laser Scanning and Machine Learning
    Evaluation of Steel Bridge Girders Damaged by Over-Height Vehicle Strikes Using Terrestrial Laser Scanning and Machine Learning
    Ibrahim, Ahmed E. ;
    Schissler, Limo R.
    2026-07-01 | PDF
    Bridge strikes caused by over-height vehicles frequently damage steel girders and can reduce their load-carrying capacity, requiring rapid and reliable evaluation to ensure structural safety. Current evaluation practices rely on manual measurements that often require traffic disruptions and simplified assessment approaches that do not fully capture ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol III Investigation of Skew and Abutment Influence on Steel IGirder Bridge Performance Under Live Load and LongTerm Thermal Effects Through Field Data and Parametric Studies
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. III): Investigation of Skew and Abutment Influence on Steel I-Girder Bridge Performance Under Live Load and Long-Term Thermal Effects Through Field Data and Parametric Studies
    Dorado, Ricardo ;
    Zhou, Siang
    2026-07-01 | PDF
    Skewed steel I-girder integral abutment bridges (IABs) are increasingly used due to their structural efficiency and elimination of deck joints. Thermally induced behavior of such bridge systems, however, remains insufficiently understood. This report documents the live load and thermal behavior of skewed steel I-girder bridges, which are representa ...
  • Safety Evaluation of Sinusoidal Centerline Rumble Strips
    Safety Evaluation of Sinusoidal Centerline Rumble Strips
    Donnell, Eric T. ;
    Gayah, Vikash V.
    2026-07-01 | PDF
    The Montana Department of Transportation installed nearly 600 miles of sinusoidal centerline rumble strips (SCLRS) in 2021.These were mostly installed on high-speed, two-lane rural highways, in the Kalispell Division and Missoula area. The sinusoidal pattern produces lower exterior noise levels than conventional centerline rumble strips, but the sa ...
  • Enhancing Pavement Safety in Texas Crash Susceptibility Modeling GIS Tool and Hydroplaning Risk Assessment
    Enhancing Pavement Safety in Texas: Crash Susceptibility Modeling, GIS Tool, and Hydroplaning Risk Assessment
    Gharaibeh, Nasir G. ;
    Gao, Lu
    2026-07-01 | PDF
    Traffic crashes and the associated injuries and fatalities remain a major public safety concern in Texas and across the United States. In this project, researchers developed statistical models to assess pavement susceptibility to crashes (i.e., the probability of crash occurrence), considering various pavement conditions, as well as traffic volume, ...
  • Development of a NonDestructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Alexander, Christopher L. ;
    Sagüés, Alberto A.
    2026-07-01 | PDF
    The University of South Florida's Corrosion Research Laboratory previously developed a tendon imaging unit (TIU) capable of providing representative cross-section images of external tendons that show strand envelope position and the likelihood of grouting deficiencies. The objective of this work was to adapt the grout-based TIU for application to w ...
  • North Dakota Statewide Traffic Safety Survey 2026 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2026: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2026-07-01 | PDF
    The statewide driver traffic safety survey provides baseline and longitudinal metrics for the Highway Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In additi ...
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