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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 841 - 860 of 35448 results
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Portland CementTreated Base Technical Summary
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Portland Cement-Treated Base [Technical Summary]
    Daily, Koby ;
    Jones, Christopher
    2024-07-01 | PDF
    This research was divided into two studies. The first study focused on D-cracked recycled concrete aggregate (RCA) portland cement-treated base. RCA was obtained from D-cracked pavement sources in Topeka and Kansas City. These aggregates were used to batch three PCTB mixtures per RCA source. All mixes followed KDOT’s 90-day curing outlined in KTMR- ...
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization Technical Summary
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Subgrade Soil Stabilization [Technical Summary]
    Tavakol, Massoumeh ;
    Kulesza, Stacey
    2024-07-01 | PDF
    The primary objective of this study was to investigate the suitability of D-cracked RCA for subgrade stabilization for hot-mix asphalt (HMA) pavements. This research also evaluated the strength, stiffness, and shrinkage potential of clay subgrade beneath HMA pavements stabilized using D-cracked RCA and various stabilizers. The selected stabilizers ...
  • Enhancing the GDOTs Maintenance Decision Trees Considering the Effectiveness of Various Treatment Options in Different Geographical Locations and Over Time
    Enhancing the GDOT’s Maintenance Decision Trees Considering the Effectiveness of Various Treatment Options in Different Geographical Locations and Over Time
    Moore, Brian P ;
    Baek, Minsoo
    2024-07-01 | PDF
    The Georgia Department of Transportation (GDOT) is responsible for pavement management of 7,100 centerline miles, encompassing diverse terrain types. The conventional “one size fits all” approach is no longer viable as pavement condition depends on several internal and external factors that are different from district to district, e.g., material, c ...
  • Statewide Lane Reconfiguration Road Diet Screening for Louisiana Research Project Capsule 246SS
    Statewide Lane Reconfiguration “Road Diet” Screening for Louisiana: Research Project Capsule [24–6SS]
    Bian, Ruijie “Rebecca” ;
    Rupnow, Tyson
    2024-07-01 | PDF
    This research aims to investigate opportunities for, and the feasibility of, implementing road diets to help Louisiana develop a network that better accommodates non-motorized travel and meets other potential needs (e.g., speed management).
  • Review of LowClearance Early Warning Device Options for Illinois
    Review of Low-Clearance Early Warning Device Options for Illinois
    Sai, Shang ;
    Ouyang, Yanfeng
    2024-07-01 | PDF
    Bridge or tunnel strikes by over-height vehicles are a challenge to the transportation industry. This problem causes significant economic and social losses to the transportation industry. Low-clearance detection warning (LCDW) is one of the important technological means to address this issue. This research project was sponsored by Illinois Departme ...
  • Data Acquisition and Processing Using Artificial Intelligence and Machine Learning
    Data Acquisition and Processing Using Artificial Intelligence and Machine Learning
    Loos, Ryan ;
    Egge, Mark
    2024-07-01 | PDF
    Artificial intelligence (AI) and machine learning (ML) offer state transportation agencies promising tools to help them advance their missions by informing decision making; improving information accuracy, completeness, and timeliness; and automating tedious tasks to free up valuable DOT resources. The objective of this research was to provide MoDOT ...
  • Influencing Mode Shift Through Behavioral Change Strategies
    Influencing Mode Shift Through Behavioral Change Strategies
    Mishra, Sabyasachee ;
    Golias, Mihalis M.
    2024-07-01 | PDF
    This research is a behavioral approach to address the critical transportation challenges in Tennessee, particularly the reliance on Single Occupant Vehicles (SOVs). Despite efforts by different agencies across the US to promote sustainable alternatives through Travel Demand Management (TDM) initiatives, public participation and the effectiveness of ...
  • Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete
    Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete
    Parsons, Robert L. ;
    Liu, Hao
    2024-07-01 | PDF
    As an alternative to aggregate as backfill material in mechanically stabilized earth (MSE) walls, lightweight cellular concrete (LCC) significantly reduces the weight of MSE wall mass, corresponding settlement of the foundation soil, and lateral earth pressures behind wall facing. Steel strips, geogrids, or steel rods are commonly used to reinforce ...
  • Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete Technical Summary
    Field Monitoring of a Mechanically Stabilized Earth Wall Backfilled with Lightweight Cellular Concrete [Technical Summary]
    Parsons, Robert L. ;
    Liu, Hao
    2024-07-01 | PDF
    This report provides the results from a study of an LCC-MSE wall test section, including vertical earth pressures and settlement, lateral earth pressures, temperatures throughout the fill, and pullout resistance of reinforcement at various points in the curing process for approximately one year.
  • Striping Program
    Striping Program
    Brown, Henry ;
    Edara, Praveen
    2024-07-01 | PDF
    The use of wider (greater than 4 in) edge line pavement markings is recognized as a proven safety countermeasure by the Federal Highway Administration (FHWA). However, providing wider edge lines can pose challenges due to budget and striping capacity constraints. One strategy that could be used to address the capacity constraints involves reducing ...
  • Peaked Too Soon Analyzing the Shifting Patterns of PM Peak Period Travel in Southern California
    Peaked Too Soon? Analyzing the Shifting Patterns of PM Peak Period Travel in Southern California
    Speroni, Samuel ;
    Siddiq, Fariba
    2024-07-01 | PDF
    Daily vehicle travel collapsed with the onset of the COVID-19 pandemic in early 2020 but largely bounced back by late 2021. The pandemic caused dramatic changes to working, schooling, shopping, and leisure activities, and to the travel associated with them. Several of these changes have so far proven enduring. So, while overall vehicle travel had l ...
  • Induced Travel Estimation Revisited
    Induced Travel Estimation Revisited
    Manville, Michael
    ORCID ICON IMG
    2024-07-01 | PDF
    Suppose a government adds two lanes to a highway in both directions but then restricts access to those lanes. The lanes will be “managed”—open only to people in carpools, or to people in single-occupancy vehicles who pay a toll. The toll will vary in response to demand, with the goal of avoiding congestion and keeping vehicles moving. Will the tota ...
  • Developing a CrossAsset Allocation Mechanism
    Developing a Cross-Asset Allocation Mechanism
    Wilcoxson, Jon ;
    Gibson, Bryan
    2024-07-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has developed several tools and methods to compare the value of proposed projects within specific programs and asset classes, including the Enhanced Bridge Prioritization Index, Enhanced Pavement Prioritization Index, and the Strategic Highway Investment Formula for Tomorrow (SHIFT). Although immensely val ...
  • Early Age Concrete Acceptance
    Early Age Concrete Acceptance
    Mohr, Benjamin ;
    Islam, M. Shariful
    2024-06-30 | PDF
    The Tennessee Department of Transportation (TDOT) is administering more early strength requirements due to accelerated project delivery timelines. Therefore, the main objective of the current study was to establish a non-destructive procedure to predict the strength at an early age. For this, the Nurse-Saul maturity function was considered with a d ...
  • Electronic Water Level Sensors for Monitoring Scour Critical Structures
    Electronic Water Level Sensors for Monitoring Scour Critical Structures
    Kerkez, Branko ;
    Galvin, Kate Kusiak
    2024-06-28 | PDF
    This report details a research project aimed at developing and deploying a cost-effective water level sensor network for monitoring scour critical bridges in Michigan. The project involved a comprehensive review of existing water level monitoring technologies, followed by the selection and pilot deployment of Open-Storm sensors on over 30 bridges a ...
  • NonNuclear Moisture Content and Density Determination
    Non-Nuclear Moisture Content and Density Determination
    Coffman, Richard A. ;
    Barry, Michelle L
    2024-06-28 | PDF
    Adequate soil compaction is important for the stability and safety of structures and transportation infrastructure. Thus, methods utilized to obtain properties that control the quality of compaction in the field are essential to ensure proper construction. The most common method to measure these properties in the field is the Nuclear Density Gauge. ...
  • Development of Pavement Performance Models for MDOT A Neural Network Approach
    Development of Pavement Performance Models for MDOT: A Neural Network Approach
    Yasarer, Hakan ;
    Najjar, Yacoub M.
    2024-06-26 | PDF
    The continuous investigation into the mechanical properties and rehabilitation management of existing pavements is vital for the sustainability and efficiency of transportation systems. The Mississippi Department of Transportation (MDOT) database, containing over 40 million records, necessitates modernized decision-making models that align with cur ...
  • Highway Sign Support Systems Condition Assessment Deterioration Models and Asset Management
    Highway Sign Support Systems: Condition Assessment Deterioration Models and Asset Management
    Salama, Talat ;
    Chae, Andy M
    2024-06-20 | PDF
    Sign support systems are important structures in the Connecticut Department of Transportation (CTDOT) bridge management system. Periodic inspections and maintenance activities are needed as long-term cost-effective maintenance strategy. This research provided the deterioration model and asset management plan for sign support systems to be considere ...
  • Workflows Implementation Tools and Guidance for Efficient UAVenabled Bridge Inspection
    Workflows, Implementation Tools, and Guidance for Efficient UAV-enabled Bridge Inspection
    Karimoddini, Ali ;
    Cavalline, Tara L
    2024-06-05 | PDF
    This project developed workflows and tools to advance the implementation and adoption of UASs to support bridge inspection practices. A series of workflows was developed to guide inspection personnel when conducting UAS- enabled bridge inspections, and guidance was prepared to assist agencies in the identification of bridge and site characteristics ...
  • OSTR Research Roundup Newsletter June 2024
    OST-R Research Roundup Newsletter: June 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-06-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
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