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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 5301 - 5320 of 36022 results
  • Use of Geosynthetics for Separation and Stabilization in LowVolume Roadways
    Use of Geosynthetics for Separation and Stabilization in Low-Volume Roadways
    Hoppe, Edward J ;
    Hossain, M Shabbir
    2019-10-01 | PDF
    The implementation of geosynthetics in road construction in the United States dates back to the 1970s. Although the benefits of these materials are widely recognized, actual design and construction practices are not universal. Guidelines for use are often developed locally based on specific field experience. Currently, the Virginia Department of Tr ...
  • Carbon Fiber Reinforced Polymer CFRP for Pretension Applications Material Acceptance Criteria and Advancing Anchorage Designs
    Carbon Fiber Reinforced Polymer (CFRP) for Pretension Applications: Material Acceptance Criteria and Advancing Anchorage Designs
    Tanks, Jonathon D ;
    Sharp, Stephen R
    2019-10-01 | PDF
    One of the main causes of structural deficiency in concrete bridges is the deterioration of the constituent materials. In order to achieve the goal of a design life of 75 to 100 years, it is imperative that pretensioned elements—girders, piles, and deck panels—contain corrosion-resistant or corrosion-free strands. The Virginia Department of Transpo ...
  • Laboratory and Outdoor Exposure Site Evaluations of Portland Limestone Cements
    Laboratory and Outdoor Exposure Site Evaluations of Portland Limestone Cements
    Garcia, Jose E ;
    Tiburzi, Nicolas N
    2019-10-01 | PDF
    The research described in this report was funded by the Texas Department of Transportation (TxDOT), with an emphasis on portland limestone cements (PLCs) with higher limestone contents (e.g., greater than 15%), particularly in paving applications. The project was quite comprehensive and included the full-scale production of seven different cements ...
  • TravelTime Reliability in Simulation and Planning Models Utah Case Study SHRP2 L04 IAP Round 7
    Travel-Time Reliability in Simulation and Planning Models: Utah Case Study (SHRP2 L04 IAP Round 7)
    Liu, Xiaoyue Cathy ;
    Haghighi, Nima
    2019-10-01 | PDF
    Travel-time reliability is a crucial indicator in transportation systems performance assessment. Previous studies mostly relied on historical detectors or trajectory data for reliability analysis; however, data availability and limited sample size create major obstacles for robust and comprehensive assessment. Moreover, such analysis that is only b ...
  • Modeling Framework for Socially Inclusive Bikesharing Services
    Modeling Framework for Socially Inclusive Bikesharing Services
    Qian, Xiaodong
    ORCID ICON IMG
    2019-10-01 | PDF
    Bikeshare programs are increasingly popular in the United States and they are an important part of sustainable transportation systems, offering a viable mode choice for many types of last-mile trips. This popularity means that an increasing number of people can enjoy the convenience of cycling and the associated physical health benefits without act ...
  • Development of a Mode Choice Model To Estimate Evacuation Transit Demand
    Development of a Mode Choice Model To Estimate Evacuation Transit Demand
    Wilmot, Chester ;
    Bian, Ruijie
    2019-10-01 | PDF
    Since Hurricane Katrina, transit evacuation service has been seen to serve critical needs in affected cities and an increasing number of hurricanes have struck the east coast where more people rely on public transportation to evacuate. Thus, it is important to model mode choice in evacuation for a better estimation of evacuation transit demand. In ...
  • SNIP Light User Manual
    SNIP Light User Manual
    Tarko, Andrew P. ;
    Thomaz, Jose E.
    2019-10-01 | PDF
    A systemic approach to identifying road locations that exhibit safety problems was provided by the Safety Needs Identification Program (SNIP and SNIP2) developed by the Purdue University Center for Road Safety (CRS). The new version SNIP Light has been developed to provide other uses with planning level traffic safety analysis capability for a wide ...
  • Sustainability and Resiliency of Concrete Rapid Repairs Utilizing Advanced Cementitious Materials FreezeThaw Loads
    Sustainability and Resiliency of Concrete Rapid Repairs Utilizing Advanced Cementitious Materials: Freeze/Thaw Loads
    Adams, Matthew P. ;
    Bandelt, Matthew J
    2019-10-01 | PDF
    This report provides a review of advanced cementitious materials that can be used in transportation infrastructure to resist freeze-thaw loading durability conditions. The report begins by providing a literature review of the mechanical and durability properties of rapid repair systems. A summary of discussion points held during a workshop held on ...
  • Nonlinear Dimension Reduction for Hybrid Track Quality
    Nonlinear Dimension Reduction for Hybrid Track Quality
    Lasisi, Ahmed ;
    Attoh-Okine, Nii
    2019-10-01 | PDF
    Rail geometry defects constitute a major cause of accidents in the United States. Geometry related accidents are often very severe and damaging. While rail geometry-caused derailments continue to increase according to Federal Railroad Administration (FRA) safety data, track quality analysis remains effectively unchanged. The use of TQI or track qua ...
  • Load Rating of Bridge LOG471184 Engineering Research Services 20172020 Task 5
    Load Rating of Bridge LOG-47-1184: Engineering Research Services 2017-2020 Task 5
    Khoury, Issam ;
    Steinberg, Eric
    2019-10-01 | PDF
    Bridge LOG-47-1184, a four-lane concrete highway bridge, was instrumented and subjected to controlled vehicle load testing in May 2019. The load response data collected were used to generate load Rating Factors (RFs) via a three-dimensional finite element model (FEM) created using ABAQUS, which were compared to those generated by MIDAS/Civil softwa ...
  • Connected Vehicle VehicletoInfrastructure Support of Active Traffic Management
    Connected Vehicle Vehicle-to-Infrastructure Support of Active Traffic Management
    Hadi, Mohammed ;
    Iqbal, Md Shahadat
    2019-10-01 | PDF
    Connected vehicle (CV) technologies promise transformative changes in Active Traffic Management (ATM) of freeways and arterials and have the potential to support Integrated Corridor Management (ICM). The goal of this project was to provide information to support the Florida Department of Transportation (FDOT) and other transportation agencies in th ...
  • Evaluation of Highway Safety Improvement Projects and Countermeasures Technical Report
    Evaluation of Highway Safety Improvement Projects and Countermeasures: Technical Report
    Tsapakis, Ioannis ;
    Sharma, Sushant
    2019-10-01 | PDF
    The Highway Safety Improvement Program (HSIP) is a core Federal-aid, state-administered program in which each state is required to develop and establish planning, implementation, and evaluation processes. The goal of evaluation activities is to determine if highway safety improvements are achieving the desired results and the investments are worthw ...
  • Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects Technical Report
    Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects: Technical Report
    Tsapakis, Ioannis ;
    Holik, William
    2019-10-01 | PDF
    The Highway Safety Improvement Program (HSIP) aims to achieve a reduction in the number and severity of fatalities and serious injury crashes on all public roads by implementing highway safety improvement projects. Transportation agencies continuously try to find ways to improve their HSIP. Over the last few years, particular emphasis has been plac ...
  • Prototype Design and Evaluation of Hybrid Solid Oxide Fuel Cell Gas Turbine Systems for Use in Locomotives
    Prototype Design and Evaluation of Hybrid Solid Oxide Fuel Cell Gas Turbine Systems for Use in Locomotives
    Azizi, Ali ;
    Ahrend, Philipp
    2019-10-01 | PDF
    Hybrid solid oxide fuel cell-gas turbine (SOFC-GT) systems are among the most efficient and lowest emitting power generation systems conceived for use in locomotives. Their superiority was proven in stationary power applications with near-zero (natural gas operation) to zero (hydrogen operation) pollutant emissions. However, the feasibility and dyn ...
  • CalibrationDevelopment of Safety Performance Functions in New Jersey Technical Brief
    Calibration/Development of Safety Performance Functions in New Jersey: [Technical Brief]
    Ozbay, Kaan
    ORCID ICON IMG
    2019-10-01 | PDF
    The main objective of this research project is to (1) calibrate the SPFs provided in the HSM using New Jersey (NJ) data and (2) develop new NJ-specific SPFs as appropriate. The facility types considered for this research project include segments and intersections of rural two-lane two-way, rural multilane, and urban and suburban roads. The followin ...
  • Incorporating Active Transport Into the Regional Planning Process To Support First and Last Mile Travel
    Incorporating Active Transport Into the Regional Planning Process To Support First and Last Mile Travel
    Walthall, Rydell D. ;
    Walton, C Michael
    2019-10-01 | PDF
    This report details the creation and proper use of a comprehensive MPO database. The database details each MPO’s governance structure, committees, and travel demand modeling capabilities with an emphasis on non-automotive transportation modes. The report also outlines a resource to group MPOs by megaregion, which could aid with the comparison of pl ...
  • Navigating New Mobility Policy Approaches for Cities
    Navigating New Mobility: Policy Approaches for Cities
    Steckler, Becky ;
    Davidson, Jennifer
    2019-10-01 | PDF
    This purpose of this report is to help the cities of Gresham, Oregon and Eugene, Oregon understand the potential impacts of new mobility technologies – with an emphasis on autonomous vehicles (AVs) – and prepare a policy response. While Gresham and Eugene are case studies, it provides communities of all sizes information on how new mobility service ...
  • An Assessment of Intercity Bus Services in Illinois
    An Assessment of Intercity Bus Services in Illinois
    Metaxatos, Paul ;
    Sriraj, P S
    2019-10-01 | PDF
    Ongoing research about intercity bus operations in Illinois has reviewed federal and Illinois Department of Transportation (IDOT) intercity bus policies and regulations and obtained experiences from other states regarding their strategies to meet federal and state-level requirements. This study will examine the transportation providers’ viewpoint a ...
  • Rejuvenator Laboratory Characterization and Field Performance
    Rejuvenator Laboratory Characterization and Field Performance
    Zhou, Fujie ;
    Karki, Pravat
    2019-10-01 | PDF
    Recycled materials including reclaimed asphalt pavements (RAP) and recycled asphalt shingles (RAS) have been widely used in asphalt mixes in Texas with at least three benefits: reducing construction cost, conserving raw materials and environment, and improving rutting resistance. However, there are two major concerns over the use of RAP and RAS: va ...
  • Durability Aspects of Stabilized Quarry Byproduct Pavement Base and Subbase Applications
    Durability Aspects of Stabilized Quarry By-product Pavement Base and Subbase Applications
    Qamhia, Issam ;
    Tutumluer, Erol
    2019-10-01 | PDF
    Recent research conducted at the Illinois Center for Transportation (ICT-R27-168) evaluated sustainable applications of quarry by-products (QB) or QB blended with coarse-recycled aggregates as chemically stabilized base and subbase layers. The research proved that stabilized QB pavement applications have satisfactory pavement performance. This proj ...
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