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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 2661 - 2680 of 35959 results
  • Utilization of Accelerated Pavement Tester APT for New Materials and Pavement Structure Research
    Utilization of Accelerated Pavement Tester (APT) for New Materials and Pavement Structure Research
    Huang, Baoshan ;
    Jiang, Xi
    2022-05-30 | PDF
    Accelerated pavement test (APT) is defined as the controlled application of a prototype wheel loading at the appropriate load to the full-scale pavement structure, which is used to determine the structural responses and performance of the pavement in a short period. Inverted pavement is an unconventional type of flexible pavement structure. In this ...
  • ProofofConcept Research of Roadside LiDAR Sensing Multimodal Traffic
    Proof-of-Concept Research of Roadside LiDAR Sensing Multimodal Traffic
    Xu, Hao ;
    Zhao, Junxuan
    2022-05-30 | PDF
    Based on the project team's multiple years of research, deployment, and engineering application expertise, this project evaluated the accuracy, reliability, and efficiency of roadside LiDAR sensing and explored various traffic scenarios and applications of roadside LiDAR sensors. This project evaluated the accuracy, reliability, and efficiency of r ...
  • Quantify Freeway Safety Service Patrol and Protect the Queue Impact on Transportation Network Reliability
    Quantify Freeway Safety Service Patrol and Protect the Queue Impact on Transportation Network Reliability
    Zhang, Hairuilong ;
    Gu, Yangsong
    2022-05-30 | PDF
    The objective of this project is to evaluate and quantify the impacts and benefits of Freeway Safety Service Patrol (FSSP) and Protect the Queue (PTQ) programs using data-driven analysis. TDOT’s Locate/IM and PTQ daily working reports data are the primary source of this study, which will help better understand the characteristics of incidents. WAZE ...
  • Design Considerations and Limitations of Rock DowelsAnchors Loaded in Shear
    Design Considerations and Limitations of Rock Dowels/Anchors Loaded in Shear
    Palomino, Angelica M. ;
    Mobley, Sarah J.
    2022-05-30 | PDF
    In Tennessee, cut rock slopes with exposed discontinuities are often reinforced with grouted steel anchors installed across the discontinuity to stabilize the system by immobilizing the rock material above the sliding surface. These elements resist shear loading rather than function in tension. Yet, the steel bar may bend in cases where the discont ...
  • Airports as Connected Activity Centers
    Airports as Connected Activity Centers
    Miller, Matthew McKee ;
    Peng, Justin
    2022-05-25 | PDF
    This research project determined how airports could function as connected activity centers. The current state of policy is to treat airports as secluded from the rest of the metropolitan area and only engage in reactive planning in response to specific threats or crises. To seek out other models of airport development, a combination of literature r ...
  • Tire Derived Aggregate for Underdrain Applications Final Report
    Tire Derived Aggregate for Underdrain Applications - Final Report
    Miller, Tanya
    2022-05-18 | PDF
    Since 1990, VTrans and the Vermont Agency of Natural Resources (VANR) have had an interest in the repurposing of tire byproducts in transportation infrastructure, including the use of shredded whole scrap tires, known as Tire Derived Aggregate (TDA). Vermont’s universal recycling laws have made reliable quantities of material available, though a ma ...
  • Superpave 5 Lab Mix Design Procedure
    Superpave 5 Lab Mix Design Procedure
    Tarefder, Rafiqul A. ;
    Hasan, Md Mehedi
    2022-05-15 | PDF
    The traditional Superpave (SP4) mix is designed at 4% air voids, while the mix is compacted at 7%-8% air voids in the field with the belief that the pavement will achieve 4% air voids or 96% density within a few years. However, several studies have reported that the maximum density that a pavement can achieve is about 94% or 6% air voids. Such high ...
  • LongLasting Open Graded Friction Course OGFC for Surfacing New Mexico Roads
    Long-Lasting Open Graded Friction Course (OGFC) for Surfacing New Mexico Roads
    Tarefder, Rafiqul A. ;
    Hasan, Md Amanul
    2022-05-11 | PDF
    This study investigated the applicability of two performance grade (PG) binders: PG 64-28+ and PG 76-22+ in open graded friction course (OGFC) by comparing their performances to that of an existing PG 70-28+, which is the only binder currently being used in OGFC mixes in New Mexico. A goal of this study was to evaluate the effectiveness of New Mexi ...
  • Yielding Compliance at High Visibility Crosswalks
    Yielding Compliance at High Visibility Crosswalks
    O’Brien, Sarah Worth ;
    Ahmed, Ishtiak
    2022-05-06 | PDF
    Marked crosswalks are a type of traffic control device that indicate to drivers where to expect people crossing the street, indicate to pedestrians where to cross, and - in the case of a midblock location – create a legal crosswalk. Marked crosswalks can be either basic (e.g., transverse lines) or high-visibility (e.g., continental, bar pair, or la ...
  • Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth
    Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth
    Aydilek, Ahmet ;
    Davis, Allen P
    2022-05-02 | PDF
    Poor structural properties and nutrient profiles of disturbed soils often require supplemental organic matter for promoting better vegetation establishment. Compost and compost-related products, when added to soils, have proven to enhance plant growth and improve infiltration of rainwater, thereby mitigating soil erosion and excess nutrient release ...
  • WAZE Data Reporting
    WAZE Data Reporting
    Gu, Yangsong ;
    Zhang, Hairuilong
    2022-05-01 | PDF
    This study evaluated the quality of crowdsourced Waze data (including reports and speed) and explored promising use scenarios of Waze data to facilitate the development of intelligent transportation in Tennessee. To this end, the thoroughly assessed Waze reports quality in terms of spatiotemporal accuracy and coverage. The study found Waze users re ...
  • Winter Pothole Treatments for Local Roads Fact Sheet
    Winter Pothole Treatments for Local Roads [Fact Sheet]
    Nazzal, Munir D ;
    Abbas, Ala
    2022-05-01 | PDF
    This report summarizes the results of a study was conducted to identify efficient and cost-effective pothole patching treatments and provide recommendation for optimal methods and materials that various Local Public Agencies (LPAs) can use to enhance the performance and longevity of pothole patches installed during the winter season. To achieve the ...
  • Georgia Express Lane Corridors Vehicle Occupancy and Throughput Study 20182020 Volume I Vehicle and Person Throughput Analysis Before and After the I75 Northwest Corridor and I85 Express Lanes Extension
    Georgia Express Lane Corridors Vehicle Occupancy and Throughput Study 2018-2020: Volume I: Vehicle and Person Throughput Analysis Before and After the I-75 Northwest Corridor and I-85 Express Lanes Extension
    Guensler, Randall ;
    Liu, Haobing
    2022-05-01 | PDF
    Ongoing assessment of system performance monitoring is critical to successful and efficient transportation planning, ensuring that infrastructure investments provide a desired return on investment. As with any new transportation facility, it is important to understand how Express Lane facilities affect travel behavior, resulting on-road vehicle act ...
  • Field Implementation of the Vertical In situ Permeameter VIP Summary
    Field Implementation of the Vertical In situ Permeameter (VIP) [Summary]
    Florida. Department of Transportation
    2022-05-01 | PDF
    University of Florida researchers conducted tests of a promising new permeameter, the vertical in situ permeameter (VIP), at sites across the state of Florida.
  • Connecting Demand Response Transit With Fixed Service Transit
    Connecting Demand Response Transit With Fixed Service Transit
    Mishra, Sabyasachee ;
    Brakewood, Candace
    2022-05-01 | PDF
    Public transportation providers are constantly striving to maximize available resources in terms of cost and vehicle fleet to deliver high-quality services that allow passengers to finish their trips between origins and destinations in the time allotted. Even though buses and metro systems serve a vast number of people, some passengers may find the ...
  • Automated Guardrail Inventory and Condition Evaluation
    Automated Guardrail Inventory and Condition Evaluation
    Ai, Chengbo ;
    Hou, Qing
    2022-05-01 | PDF
    MassDOT actively works with FHWA on the Manual for Assessing Safety Hardware (MASH) implementation. It is critical to plan and manage MASH upgrades and integrate the guardrail asset within its asset management plan with a complete guardrail inventory. This study aims at developing and validating new processes using automated methods to identify and ...
  • Alternative Funding Approaches for Iowa Roads
    Alternative Funding Approaches for Iowa Roads
    Rouse, Eric ;
    Shaw, John
    2022-05-01 | PDF
    The purchasing power of Iowa’s primary transportation revenue source, the fuel tax, has decreased over time due to annual fuel tax revenues not keeping pace with the growth in costs. This study evaluated Iowa’s existing transportation funding sources and through a literature review, identified approaches being used around the country to increase tr ...
  • Transportation Behavior Among Older Vietnamese Immigrants in the DallasFort Worth Metroplex WellBeing Geospatial Mobility and Potential Indicators for Ride Providers Geospatial Burden
    Transportation Behavior Among Older Vietnamese Immigrants in the Dallas-Fort Worth Metroplex: Well-Being, Geospatial Mobility, and Potential Indicators for Ride Providers’ Geospatial Burden
    Mauldin, Rebecca ;
    Mattingly, Stephen
    2022-05-01 | PDF
    Nearly 4.6 million immigrants aged 65 and older live in the United States. This population is expected to more than triple in size by 2050. A lack of culturally appropriate transportation solutions for older immigrants creates disparities in access to services for older immigrant populations, increasing their risk of social isolation and reduced ph ...
  • Enhancing FreezeThaw Resistance of Tennessee Concrete Mixes Through Improved Air Void Testing
    Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes Through Improved Air Void Testing
    Huang, Baoshan ;
    Ma, Z John
    2022-05-01 | PDF
    The quality of the air void system in concrete is critical for the freeze-thaw durability and service life of concrete structures. In Tennessee, the current Tennessee Department of Transportation (TDOT) specification only specifies the air content for fresh concrete mixes. Currently, the most widely used methods to evaluate the freeze-thaw durabili ...
  • Exploring the Consumer Market of Microtransit Services in the Sacramento Area California
    Exploring the Consumer Market of Microtransit Services in the Sacramento Area, California
    Xing, Yan ;
    Pike, Susan
    2022-05-01 | PDF
    Microtransit is an emerging, technology-enabled, on-demand transportation mode whereby small shuttles provide shared rides through flexible routing and scheduling in response to customers’ requests for rides. Given its potential to address the equity and accessibility needs of the public, public transportation agencies are experimenting with this s ...
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