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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 3121 - 3140 of 36873 results
  • 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 ...
  • Mitigating Stripping in Asphalt Mixtures
    Mitigating Stripping in Asphalt Mixtures
    Huang, Baoshan ;
    Xiao, Rui
    2022-05-01 | PDF
    Moisture damage is one of the major types of asphalt pavement distress along with rutting, fatigue cracking and low-temperature cracking. Moisture, in liquid or gas form, penetrates into the interface between aggregate and asphalt and strips aggregate particles of asphalt coating, resulting in stripping and raveling. The Tennessee Department of Tra ...
  • Division of Engineering Research on Call Agreement 34652 Task 3 Scour Prediction Tools
    Division of Engineering Research on Call Agreement #34652 Task #3 – Scour Prediction Tools
    Che, Daniel ;
    White, Kevin
    2022-05-01 | PDF
    The objective of this project is to compare the most recent ODOT procedures to currently recommended FHWA practices for predicting scour, and to develop a user-friendly spreadsheet solution for calculating/predicting scour at a structure based on the latest procedures. Examples of how to use the scour prediction tool are illustrated in the report.
  • Speed Enforcement in Work Zones and Synthesis on CostBenefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network
    Speed Enforcement in Work Zones and Synthesis on Cost-Benefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network
    Mathew, Jijo K ;
    Desai, Jairaj
    2022-05-01 | PDF
    Work zone safety is a high priority for transportation agencies across the United States. High speeds in construction zones are a well-documented risk factor that increases the frequency and severity of crashes. It is therefore important to understand the extent and severity of high-speed vehicles in and around construction work zones. This study u ...
  • Selfdeicing LED Signal
    Self-de-icing LED Signal
    Cai, Hongyi ;
    Schrock, Steven
    2022-05-01 | PDF
    This Pooled Fund project [Transportation Pooled Fund Study TPF-5(351)] was aimed at developing and demonstrating a new type of self-de-icing LED signal for highway intersections as a replacement for existing LED signal lights that remain too cold to prevent snow, sleet, and ice buildup on the lens and could cause accidents in snowy conditions. The ...
  • Effectiveness of Fog Seal on Chip Sealed Low Volume Roads
    Effectiveness of Fog Seal on Chip Sealed Low Volume Roads
    Rief, Michael J ;
    Indihar, Matthew
    2022-05-01 | PDF
    This report was commissioned to gather information on the current practices of fog seal over chip seal that are being used by Cities and Counties within Minnesota. The report discusses current best practices and value added when compared to a stand-alone chip seal project. The information provided in this report was based off survey results from mu ...
  • Systemic Analysis of Bicycle and Pedestrian Safety in Utah
    Systemic Analysis of Bicycle and Pedestrian Safety in Utah
    Singleton, Patrick A. ;
    Rahman, Md Rafiur
    2022-05-01 | PDF
    The objective of this systemic analysis of bicycle and pedestrian safety in Utah was to identify risk factors, potential treatment sites, and potential countermeasures. The systemic approach to roadway safety management is a proactive means of identifying risk factors, countermeasures, and (high-risk, rather than just high-crash) treatment location ...
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