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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 3181 - 3200 of 36151 results
  • Analytical Models for Traffic Congestion and Accident Analysis
    Analytical Models for Traffic Congestion and Accident Analysis
    Liu, Hongrui ;
    Shetty, Rahul Ramachandra
    2021-11-01 | PDF
    In the US, over 38,000 people die in road crashes each year, and 2.35 million are injured or disabled, according to the statistics report from the Association for Safe International Road Travel (ASIRT) in 2020. In addition, traffic congestion keeping Americans stuck on the road wastes millions of hours and billions of dollars each year. Using stati ...
  • Safeguarding Equity in OffSite Vehicle Miles Traveled VMT Mitigation in California
    Safeguarding Equity in Off-Site Vehicle Miles Traveled (VMT) Mitigation in California
    Alexander, Serena E ;
    Alfonzo, Mariela
    2021-11-01 | PDF
    Historically, the State of California assessed the environmental impacts of proposed developments based on how it was projected to affect an area’s level of service (LOS). However, as LOS focused on traffic delays, many agencies simply widened roads, which was an ineffective way to reduce greenhouse gas emissions (GHGs). With the passage of Senate ...
  • A Review of Kentuckys ExtendedWeight Hauling Programs
    A Review of Kentucky’s Extended-Weight Hauling Programs
    Marks, P Gayle ;
    Wilcoxson, Jon
    2021-11-01 | PDF
    Kentucky established its Extended Weight Coal or Coal By-products Haul Road System (EWCHRS) to increase the state’s competitiveness within the coal industry and reduce financial burdens on coal haulers. A new extended-weight haul system for unrefined petroleum products will come online in 2022. To facilitate enforcement of weight limits throughout ...
  • Analysis of Advanced Driver Assistance Systems in Police Vehicles A Survey Study
    Analysis of Advanced Driver Assistance Systems in Police Vehicles: A Survey Study
    Wozniak, David ;
    Shahini, Farzaneh
    2021-11-01 | PDF
    Few studies have examined the impact of advanced driver-assistance systems (ADAS) on police officers to improve driver safety and prevent crashes. This is in spite of police officers having higher driving-related mortality rates than average civilians. To fill this gap, a survey study was conducted on 73 police officers to assess their opinions on ...
  • Capitalizing on Construction Records to Identify Relationships between Construction and Longterm Project Performance Final Report
    Capitalizing on Construction Records to Identify Relationships between Construction and Long-term Project Performance: Final Report
    Rahman, Syeda ;
    Sun, Jingran
    2021-11-01 | PDF
    TxDOT keeps records of contracted roadway projects in several databases: materials and test records, collected for the quality control / quality assurance program, in the SiteManager (SMGR) database; construction-related information in the Design and Construction Information System (DCIS); and performance measures in the Pavement Analyst (PA) datab ...
  • Bus Operations of Three San Francisco Bay Area Transit Agencies during the First Year of the COVID19 Pandemic
    Bus Operations of Three San Francisco Bay Area Transit Agencies during the First Year of the COVID-19 Pandemic
    Kurzhanskiy, Alex A. ;
    Lapardhaja, Servet
    2021-11-01 | PDF
    From March 2020 through March 2021, researchers monitored three San Francisco Bay Area transit agencies: two large – Alameda-Contra Costa Transit District (AC Transit), Valley Transportation Authority (VTA); and one small – Tri Delta Transit. As the lockdown was imposed in response to the COVID-19 pandemic, white-collar commuters, students, and the ...
  • Selection Criteria for Coarse Aggregate in Flexible Pavement Surfaces
    Selection Criteria for Coarse Aggregate in Flexible Pavement Surfaces
    Goehl, Darlene C ;
    Gurganus, Charles
    2021-11-01 | PDF
    The safety of the traveling public is a priority for the Texas Department of Transportation (TxDOT) and the Federal Highway Administration (FHWA). From the 1960s to current practice, FWHA’s guidance has evolved along with TxDOT’s policies and procedures to reduce wet-weather accidents. TxDOT’s Form 2088 is part of the wet-surface crash reduction pr ...
  • Safe Intersection Crossing for Pedestrians With Disabilities
    Safe Intersection Crossing for Pedestrians With Disabilities
    Smith, Stephen F. ;
    Rubinstein, Zachary B.
    2021-11-01 | PDF
    The focus of this project has been on addressing some remaining obstacles to the general deployment of PedPal, a smartphone app that assists pedestrians with disabilities in safely crossing signalized intersections. Specifically, work has centered mainly on the design and development of two new capabilities: (1) an approach to localization that is ...
  • Use of LRFR Methodology for Load Rating of INDOT Steel Bridges
    Use of LRFR Methodology for Load Rating of INDOT Steel Bridges
    Khanna, Prekshi ;
    Bowman, Mark D.
    2021-11-01 | PDF
    Load rating of bridges before 1994 was primarily conducted by Load Factor Rating (LFR). In 1994, the American Association of State Highway and Transportation Officials (AASHTO) developed and encouraged the use of a probabilistic-based method titled Load and Resistance Factor Design (LRFD) for carrying out bridge design. A new methodology consistent ...
  • Finite Element Analysis of the Lateral Load Test on Battered Pile Group at I10 Twin Span Bridge
    Finite Element Analysis of the Lateral Load Test on Battered Pile Group at I-10 Twin Span Bridge
    Abu-Farsakh, Murad Y. ;
    Souri, Ahmad
    2021-11-01 | PDF
    The design of pile foundations to resist lateral loads is essential in offshore structures and bridge foundations. The lateral behavior of piles has been studied in the past by experimental investigations coupled with analytical and numerical methods. The problem is complex due to the nonlinearities from soil behavior, gap formation, and pile-soil- ...
  • Assessment of Deteriorated Structural Concrete To Provide Durable Repairs
    Assessment of Deteriorated Structural Concrete To Provide Durable Repairs
    Hopwood, Theodore ;
    Goff, Christopher
    2021-11-01 | PDF
    Most of the structural elements on Kentucky bridges are made of reinforced concrete. Many of these elements deteriorate as a result of corrosion of the reinforcing steel caused by carbonation and — primarily — applications of chlorides by the Kentucky Transportation Cabinet (KYTC). Corrosion of reinforcing steel is reviewed along with assessment pr ...
  • Ridesourcing in Rural Communities North Dakota Driver Survey
    Ridesourcing in Rural Communities, North Dakota Driver Survey
    Vachal, Kimberly
    2021-11-01 | PDF
    The rise of ridesourcing services such as Uber and Lyft in recent years has revolutionized urban transportation across the globe. With the increased popularity of these services came negative impacts on industries such as taxi cab and public transit services. In an era when ridesourcing companies are expanding rapidly in previously untouched market ...
  • InService Assessment of Road Sinkholes With 2D Ambient Noise Tomography
    In-Service Assessment of Road Sinkholes With 2D Ambient Noise Tomography
    Tran, Khiem ;
    Wang, Yao
    2021-11-01 | PDF
    Seismic methods are often used for detection of pre-collapsed sinkholes (voids) under roadway for remediation to minimize the risk to the safety of the traveling public. While the active-source seismic methods can provide accurate subsurface profiles, they require closing the traffic flow for hours during testing and potentially cause sinkhole coll ...
  • Assessing Culverts in Minnesota Fish Passage and Storm Vulnerability
    Assessing Culverts in Minnesota: Fish Passage and Storm Vulnerability
    Kozarek, Jessica ;
    Herb, William
    2021-11-01 | PDF
    Culverts at road-stream crossings can create barriers to movement within a stream network that can have dramatic consequences for fish populations by fragmenting habitat. Culverts can become barriers when flow conditions exceed fish swimming ability, e.g., for drop at the outlet and insufficient depth or excess flow velocity. In this project, we us ...
  • MASH Validation Testing of Low Profile Barrier
    MASH Validation Testing of Low Profile Barrier
    Consolazio, Gary R. ;
    Gurley, Kurtis R
    2021-11-01 | PDF
    The Florida low profile barrier—consisting of multiple interconnected portable concrete segments—is typically utilized in construction zones to separate traffic from construction activities. The original development and validation (crash testing) of the barrier were in accordance with applicable standards at the time (NCHRP Report 350). In the pres ...
  • The Development of Intermodal Freight Transport in Poland from 2007 to 2016 Barriers and Opportunities to Its Further Development
    The Development of Intermodal Freight Transport in Poland from 2007 to 2016: Barriers and Opportunities to Its Further Development
    Monka, Dominika ;
    Pyne, Robyn
    2021-11-01 | PDF
    International transport has grown dynamically in Poland since it becomes a European Union (EU) member. This being the case, it is now, more than ever, important to identify the approaches that are most suitable for delivering sustainable freight transport to the nation. Intermodal options appear to be the most appropriate for this task. This study ...
  • Quality ControlAssurance on Base Course and Embankment With the Dynamic Cone Penetrometer
    Quality Control/Assurance on Base Course and Embankment With the Dynamic Cone Penetrometer
    Ferguson, Nicholas ;
    Gautreau, Gavin
    2021-11-01 | PDF
    Nuclear moisture-density gauges (NDG) operate with the use of radioactive materials that may be hazardous to the health of the operators under certain circumstances. There is a need for test procedures using devices that are accurate, easy-to-use, economically sound, and nonradioactive. This research investigated using the Dynamic Cone Penetrometer ...
  • Alternate Interchange Signing Study for Indiana Highways
    Alternate Interchange Signing Study for Indiana Highways
    Chen, Stanley ;
    Chen, Yaobin
    2021-11-01 | PDF
    The main objectives of this research were to (1) understand signing issues from the perspective of drivers and (2) develop recommendations for improving interchange signing in Indiana to aid driver understanding and increase the safety and efficiency of highway traffic operations. An online survey with specific questions was designed and distribute ...
  • Evaluation of Open Graded Friction Courses Construction Maintenance and Performance Phase II
    Evaluation of Open Graded Friction Courses: Construction, Maintenance, and Performance Phase II
    Putman, Bradley J. ;
    Danish, Behrooz
    2021-11-01 | PDF
    This study investigated multiple factors that influence the performance of open graded friction courses (OGFC) in South Carolina with the ultimate goal of improving the long-term durability and performance of OGFCs. The research included laboratory studies to evaluate the influence of aggregate Los Angeles (LA) Abrasion and breakdown, aggregate gra ...
  • Ohios Research Initiative for Locals ORIL Research OnCall 2021ORIL6 Task 2 Current Practices and Experience for Using Chip Seal Interlayer by Ohio Local Public Agencies To Mitigate Reflection Cracking
    Ohio’s Research Initiative for Locals (ORIL) Research On-Call 2021-ORIL6 (Task 2): Current Practices and Experience for Using Chip Seal Interlayer by Ohio Local Public Agencies To Mitigate Reflection Cracking
    Nazzal, Munir D ;
    Swaleh, Safaa
    2021-11-01 | PDF
    This report summarizes the results of a research task that was conducted to identify the current state of the practice of local public agencies (LPAs) for using chip seal interlayer (CSI) to control or reduce reflection cracking of overlay and summarize the results of different studies on the use chip seal interlayer. To achieve these objectives a ...
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