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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 161 - 180 of 36569 results
  • Quality Manual for Steel Bridge Fabrication
    Quality Manual for Steel Bridge Fabrication
    Sherman, Ryan J. ;
    Stewart, Lauren K.
    2026-03-01 | PDF
    The American Association of State Highway and Transportation Officials (AASHTO) and the American Welding Society (AWS) provide extensive guidance documents that govern the welding of steel bridge members; however, none of the documents provide guidance regarding the number of times a welding nonconformance can be repaired without penalty or rejecti ...
  • Evaluation of Backfill Aggregate Properties
    Evaluation of Backfill Aggregate Properties
    Alshibli, Khalid A. ;
    Elkenawi, Mohamed
    2026-03-01 | PDF
    Open-graded granular backfill materials are widely used as retaining wall backfill due to their high shear strength, high permeability, ease to handle, and compaction characteristics. However, the current Tennessee Department of Transportation (TDOT) provisions assume a conservative angle of internal friction for backfill materials. The objective o ...
  • Creating Effective Graphic Changeable Dynamic Message Sign DMS Messaging
    Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2026-03-01 | PDF
    Successful transportation safety messages are only effective if travelers can comprehend the notices. However, one method of safety messaging, text-only messages, can be challenging for non-native English speakers and slow-reading populations, such as older adults. The addition of graphics can potentially improve message comprehension, but their ef ...
  • Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion
    Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion
    Perić, Dunja ;
    Olia, Arash Saeidi Rashk
    2026-03-01 | PDF
    The primary objective of this study was to investigate the feasibility of using lignin, an environmentally friendly biopolymer, for sustainable protection of Kansas roadsides against wind and rainfall erosion during the critical stage of construction that occurs prior to the emergence of a vegetative cover. Results from laboratory-scale experiments ...
  • Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion Technical Summary
    Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion [Technical Summary]
    Perić, Dunja ;
    Olia, Arash Saeidi Rashk
    2026-03-01 | PDF
    The primary objective of this study was to investigate the feasibility of using lignin, an environmentally friendly biopolymer, for sustainable protection of Kansas roadsides against wind and rainfall erosion during the critical stage of construction that occurs prior to the emergence of a vegetative cover. Results from laboratory-scale experiments ...
  • Creating Effective Graphic Changeable Dynamic Message Sign DMS Messaging Technical Summary
    Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2026-03-01 | PDF
    Successful transportation messages are only effective if travelers can read and comprehend the message. However, text-based messages can be challenging for non-native English speakers or slow-reading populations, such as the elderly. The addition of graphics messages as a potential aid to improve message comprehension is uncertain, as is their effe ...
  • Resilient Modulus of CoarseGrained Subgrade Soils for Pavement Design
    Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design
    Hossain, M. Shabbir ;
    Nair, Harikrishnan
    2026-03-01 | PDF
    In 2018, the Virginia Department of Transportation (VDOT) implemented the American Association of State Highway and Transportation Officials' (AASHTO) AASHTOWare-ME version 2.2.6 as the pavement design methodology for new, reconstruction, and lane-widening projects, including interstate, primary, and secondary routes with annual average daily traff ...
  • Freeway and Arterial Performance Analysis With HighResolution Vehicle Trajectory Data
    Freeway and Arterial Performance Analysis With High-Resolution Vehicle Trajectory Data
    Tian, Zong ;
    Wang, Aobo
    2026-02-28 | PDF
    This research investigates applying high-resolution vehicle trajectory data, derived from vehicle telematics, to facilitate freeway and arterial performance analysis in Nevada. Leveraging vehicle trajectory datasets crowd sourced through original equipment manufacturer (OEM) telematics, the research team conducted a comprehensive synthesis of commo ...
  • Enhance Bridge Image Attribution Through Automated Post Image Processing
    Enhance Bridge Image Attribution Through Automated Post Image Processing
    Attanayake, Upul ;
    Battu, Naveen
    2026-02-28 | PDF
    Highway agencies and consultants capture thousands of images during biennial, scoping, and request for action (RFA) inspections. Most of these files are stored with limited descriptions or inconsistent naming formats. As a result, a rich data source is underutilized. Understanding the value of this rich data source for asset management, MDOT initia ...
  • Finite Element Method FEM Matrix Study for Rapid Travel Profiler CurlWarp Correlations
    Finite Element Method (FEM) Matrix Study for Rapid Travel Profiler Curl/Warp Correlations
    Haider, Syed Waqar ;
    Ahmed, Hanan
    2026-02-28 | PDF
    Temperature-induced curling and moisture-driven warping continually reshape jointed concrete pavements (JCP), altering wheel-path profiles and affecting the International Roughness Index (IRI). This report presents an integrated framework combining finite element method (FEM) analyses, artificial neural networks (ANNs), and IRI modeling to isolate ...
  • RampCast Phase II Connected Vehicles Traffic Management Application on Indiana Highways
    RampCast Phase II: Connected Vehicles Traffic Management Application on Indiana Highways
    Mathew, Abin ;
    Sundar, Agnideven Palanisamy
    2026-02-23 | PDF
    This project advances connected vehicle applications by developing and testing an enhanced RampCast system, a comprehensive traffic management system using C-V2X technology for Indiana highways. The system features a dual-mode architecture integrating both short-range (PC5) and long-range cellular (Uu) Cellular Vehicle-to-Everything (C-V2X) communi ...
  • Pedestrian and Bicyclist Trespassing Impacts on Rail Grade Crossings Safety and Mobility
    Pedestrian and Bicyclist Trespassing Impacts on Rail Grade Crossings Safety and Mobility
    Guan, Shanyue ;
    Chen, Siqi
    2026-02-19 | PDF
    Highway roads intersect with a railroad track, forming a multimodal transportation system. The intersection is called a highway railroad grade crossing (HRGC). Because of the multiple transportation operations, induced conflict at the grade crossing, crashes may happen between road users (e.g., automobiles, pedestrians, bicyclists, etc.) and trains ...
  • Impacts of Stream Bed Adjustments on Local Bridge Morphology at Highway 281
    Impacts of Stream Bed Adjustments on Local Bridge Morphology at Highway 281
    Admiraal, David ;
    Likins, Molly
    2026-02-17 | PDF
    Nebraska sand-bed rivers have long been used in the development of well-known empirical bedload equations. Some of these studies have shown how adjustments in available sediment led to changes in local stream morphology. The sand-bed rivers of Nebraska are highly susceptible to such changes due to their wide, shallow cross-sections and erodibility. ...
  • Integration of BIM for Bridge Modeling
    Integration of BIM for Bridge Modeling
    Li, Hang ;
    Zhang, Jiansong
    2026-02-17 | PDF
    Existing INDOT bridge projects mainly use PDF plans for the official deliverables and records to be communicated, transferred, and stored among different stakeholders. With the Industry Foundation Classes (IFC) BIM standard (ISO 16739) adopted by AASHTO as the national standard for modeling bridge projects, there comes a great opportunity to upgrad ...
  • Guidelines for Use and Design of Deep Foundations for ThreeSided Structures
    Guidelines for Use and Design of Deep Foundations for Three-Sided Structures
    Wang, Yao ;
    Salgado, Rodrigo
    2026-02-11 | PDF
    Buried three-sided structures are widely used for roadway crossings and underpasses. Whereas spread footings are common, deep foundations are required when weak soils, scour risk, or site constraints exist. This study aimed to improve understanding of load-transfer mechanisms and develop guidance for the design of deep foundations supporting buried ...
  • Development of Dashboards and Procedures for Using Connected Vehicle Data to Prioritize Investments in Electric Vehicle Related Infrastructure
    Development of Dashboards and Procedures for Using Connected Vehicle Data to Prioritize Investments in Electric Vehicle Related Infrastructure
    Desai, Jairaj C. ;
    Sturdevant, Nathaniel J.
    2026-02-10 | PDF
    The National Electric Vehicle Infrastructure (NEVI) Formula Program and the Charging and Fueling Infrastructure Discretionary Grant Program together provide $7.5 billion to support states with building out a nationwide EV charging network. Indiana’s Charging the Crossroads program, funded through the NEVI program, plans to invest almost $100 millio ...
  • Research Support to INDOT on Systemwide Asset Condition Assessment Using Connected Vehicle Data
    Research Support to INDOT on Systemwide Asset Condition Assessment Using Connected Vehicle Data
    Thompson, Andrew ;
    Desai, Jairaj C.
    2026-02-04 | PDF
    Crowdsourced pavement roughness data using connected vehicles now provides cost-effective, high-resolution condition monitoring in near real-time. This study evaluates how connected vehicle data can support effective investment prioritization across Indiana’s road network and improve upon traditional data sources using surveys that are often done a ...
  • North Lombard Street Multimodal Safety Project BeforeAfter Evaluation
    North Lombard Street Multimodal Safety Project Before-After Evaluation
    Kothuri, Sirisha ;
    Anderson, Jason C.
    2026-02-01 | PDF
    This report analyzes and summarizes the changes in conflicts, user volumes, speed, travel time, and vehicle throughput before and after a multimodal safety project on N Lombard St. Results show that changes in each metric were observed in the before and after conditions. The number of persons using crosswalks decreased between 2017 and 2019 and inc ...
  • AlkaliSilica Reaction ASR Mitigation in HighAlkali Content Cements
    Alkali-Silica Reaction (ASR) Mitigation in High-Alkali Content Cements
    Behravan, Amir ;
    Arce, Gabriel A
    2026-02-01 | PDF
    This study presents a comprehensive evaluation of alkali-silica reaction (ASR) in concrete mixtures, focusing on the performance-based specifications and the critical role of supplementary cementitious materials (SCMs) in mitigation. A modified version of American Association of State Highway and Transportation Officials (AASHTO) T380 was developed ...
  • Quantifying Sustainable Pavements in VirginiaFHWA Climate Challenge Study
    Quantifying Sustainable Pavements in Virginia—FHWA Climate Challenge Study
    Amarh, Eugene A. ;
    Katicha, Samer W.
    2026-02-01 | PDF
    This study supports Virginia’s efforts to participate in the Federal Highway Administration’s Climate Challenge Program. The research team developed and applied OpenLCA models to evaluate the effects of key pavement treatments, including asphalt overlays, balanced mix designs, cold in-place recycling, full-depth reclamation, and Portland cement con ...
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