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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 7121 - 7140 of 36104 results
  • Factors Influencing Policy and Political Leadership in Improving Roadway Safety
    Factors Influencing Policy and Political Leadership in Improving Roadway Safety
    Munnich Jr., Lee W. ;
    Schmit, Matthew P
    2018-03-01 | PDF
    This study built on recent work to examine further the factors influencing policy and political leadership in adopting evidence-based policy countermeasures and integrated performance-based approaches such as Toward Zero Death (TZD) to reduce road fatalities and serious injuries. Specifically, this study sought to increase understanding of the poli ...
  • High Friction Surface Treatments Supplement
    High Friction Surface Treatments Supplement
    Bosin, Anna ;
    Martindale, Ron
    2018-03-01 | PDF
    A power point presentation made at WASHTO 2017, Juneau AK.
  • Linear Cracking in Bridge Decks
    Linear Cracking in Bridge Decks
    Balakumaran, Soundar S.G. ;
    Weyers, Richard E.
    2018-03-01 | PDF
    Concrete cracking in bridge decks remains an important issue relative to deck durability. Cracks can allow increased penetration of chlorides, which can result in premature corrosion of the reinforcing steel and subsequent spalling of the concrete deck. Although it is understood that the service life of bridge decks is affected by concrete cracking ...
  • Fatigue Resistance and Reliability of High Mast Illumination Poles HMIPs with Preexisting Cracks Project Summary
    Fatigue Resistance and Reliability of High Mast Illumination Poles (HMIPs) with Pre-existing Cracks [Project Summary]
    Engelhardt, Michael D. ;
    Morovat, Mohammed A
    2018-03-01 | PDF
    High mast illumination poles (HMIPs) are used throughout the U.S. to provide lighting along highways and at interchanges. Texas currently has about 5000 HMIPs, varying in height from 100 to 175 ft. Failures of HMIPs have been reported in several states. These collapses have been attributed to failures at the shaft-to-base plate connection.
  • A Tool for Designing MnPASS Access Spacing
    A Tool for Designing MnPASS Access Spacing
    Zitzow, Stephen ;
    Parikh, Gordon
    2018-03-01 | PDF
    Dynamically priced High Occupancy Toll (HOT) lanes have been recently added to the traffic operations arsenal in an attempt to preserve infrastructure investment in the future by maintaining a control on demand. This study focuses on the operational and design features of HOT lanes. HOT lanes’ mobility and safety are contingent on the design of zon ...
  • Simulation of Automated Vehicles Drive Cycles
    Simulation of Automated Vehicles' Drive Cycles
    LeVine, Scott
    2018-02-28 | PDF
    This research has two objectives: 1) To develop algorithms for plausible and legally-justifiable freeway car-following and arterial-street gap acceptance driving behavior for AVs 2) To implement these algorithms on a representative road network, in order to generate representative drive cycles for AVs that are both theoretically-grounded and based ...
  • Identifying Best Practices in Pavement Design Materials Construction and Maintenance in WetFreeze Climates Similar to Michigan
    Identifying Best Practices in Pavement Design, Materials, Construction, and Maintenance in Wet-Freeze Climates Similar to Michigan
    You, Zhanping ;
    Gilbertson, C.
    2018-02-28 | PDF
    The intent of this research is to identify best practices for pavements in wet-freeze climates. For the purposes of this report, a best practice is a procedure that has been shown by research or experience to produce improved results and that is established or proposed as a standard suitable for widespread implementation. This project identified th ...
  • Development of LowMaintenance Cost Median Barriers with Enhanced Safety Features Summary
    Development of Low-Maintenance Cost Median Barriers with Enhanced Safety Features [Summary]
    Abu-Odeh, Akram Y. ;
    Brackin, Michael S.
    2018-02-28 | PDF
    Median barriers separate opposing traffic lanes on divided highways. Typically, rigid median barriers are made of reinforced concrete using safety or single slope profiles. Damaged median barriers typically require lane closures, which result in congestion and additional costs to repair the damaged section. Furthermore, the risk posed to the occupa ...
  • Development of a Comprehensive Metric for Transportation Environment and Community Health
    Development of a Comprehensive Metric for Transportation, Environment, and Community Health
    Cheu, Ruey Long ;
    Balal, Esmaeil
    2018-02-28 | PDF
    This research develops a comprehensive metric that enables transportation planners and analysts to evaluate the impact of a transportation project on the environment and community health. The metric consists of transportation, environment, and community health as three different dimensions. Each dimension has a few identified criteria. Each criteri ...
  • AutoDeficit Households Determinants Travel Behavior and the Gender Division of Household Car Use
    Auto-Deficit Households: Determinants, Travel Behavior, and the Gender Division of Household Car Use
    Blumenberg, Evelyn ;
    Brown, Anne
    2018-02-28 | PDF
    The automobile plays a central role in the mobility of most households since in almost all metropolitan areas and neighborhoods within them automobiles offer greater access to destinations within a reasonable travel time than other modes of travel. Consequently, scholars find a robust and positive connection between car ownership and a range of qua ...
  • Developing Representative Michigan Truck Configurations for Bridge Load Rating
    Developing Representative Michigan Truck Configurations for Bridge Load Rating
    Eamon, Christopher D. ;
    Siavashi, Sasan
    2018-02-28 | PDF
    The objective of this study is to recommend a rating process representative of Michigan load effects for legal and extended permit vehicles. For this study, high fidelity WIM data from 20 Michigan sites were analyzed. Using vehicle weight and configuration filtering criteria developed for the project, the WIM data were filtered to capture Michigan ...
  • Further Validation of AlkaliSilica Reaction ASR Testing and Approach for Formulating ASR Resistant Mix Project Summary
    Further Validation of Alkali-Silica Reaction (ASR) Testing and Approach for Formulating ASR Resistant Mix [Project Summary]
    Mukhopadhyay, Anol ;
    Liu, Kai-Wei
    2018-02-28 | PDF
    Alkali-silica reaction (ASR) is recognized as a major concern for the Texas Department of Transportation (TxDOT). In the previous project 0-6656, a volumetric change measuring device (VCMD)–based aggregate chemical method was validated as a rapid (within 5 days) and reliable method to determine aggregate reactivity in terms of measuring composite a ...
  • 06913 Development of MASH Test Level 2 TL2 Short Radius Guardrail Treatment on Texas Roadways Summary
    0-6913: Development of MASH Test Level 2 (TL-2) Short Radius Guardrail Treatment on Texas Roadways [Summary]
    de la Fuente, Nataly ;
    Bullard, D. L.
    2018-02-28 | PDF
    Crashworthy design for installation on short radius sites has eluded the roadside safety community for over two decades. Texas A&M Transportation Institute (TTI) researchers have developed an innovative short radius guardrail system for implementation on high-speed roadways. However, there are many roadways with restrictive roadside clearances that ...
  • Enhancing Connecticuts Crash Data Collection for Serious Injury and Fatal Motor Vehicle Collisions
    Enhancing Connecticut’s Crash Data Collection for Serious Injury and Fatal Motor Vehicle Collisions
    Jackson, Eric D. ;
    Grasso, Charles
    2018-02-27 | PDF
    The Connecticut Crash Data Repository houses extensive data on all traffic crashes in Connecticut. However, pre-crash data and certain driver behaviors are unavailable as they cannot be gathered through traditional crash investigatory approach that does not involve use of an event data recorder. An Event Data Recorder (EDR), sometimes referred to a ...
  • Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning Phase I
    Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning, Phase I
    Zhang, Qiong ;
    Lu, Qing
    2018-02-26 | PDF
    Transportation authorities are responsible for managing the stormwater runoff that carries pollutants from the transportation-adjacent land and vehicles. The proper stormwater management approach like green infrastructure can help control flooding and the runoff pollutants that may impair water environment and threaten the ecosystem and human healt ...
  • Expanding Mobile Terrestrial Laser Scanning Capability and Capacity Throughout Caltrans
    Expanding Mobile Terrestrial Laser Scanning Capability and Capacity Throughout Caltrans
    Yen, Kin ;
    Donecker, Stephen
    2018-02-22 | PDF
    The purpose of this research included maintaining Caltrans’ existing Mobile Terrestrial Laser Scanning (MTLS) capability and capacity in Northern California and expanding Caltrans’ MTLS capability and capacity in Central and Southern California. The research methods included training Central and Southern California surveyors, providing deployment s ...
  • Capturing and Communicating the Value of NCDOT Research
    Capturing and Communicating the Value of NCDOT Research
    Nicholas II, Thomas ;
    Chen, Don
    2018-02-21 | PDF
    The intent in performing applied research is to further the knowledge base or solve a particular problem that is beneficial to society at large. Specifically in transportation research, project outcomes provide society with a safer, more efficient transportation infrastructure. The NCDOT has produced many successful and high value research projects ...
  • Laboratory Performance of Liquid AntiStripping Agents in Asphalt Mixtures used in South Carolina
    Laboratory Performance of Liquid Anti-Stripping Agents in Asphalt Mixtures used in South Carolina
    Amirkhanian, Serji N. ;
    Xiao, Feipeng
    2018-02-15 | PDF
    Stripping is a phenomenon involving the loss of adhesion or bond between the asphalt binder and the aggregate in an asphalt mixture. In general, stripping results from the presence of water combined with the adhesive relationship of the aggregate and the asphalt binder. Most State Highway Agencies (SHAs)require the use of an anti-strip additive to ...
    Supporting Files
  • Work Zone Traffic Management in Rehabilitation of M2
    Work Zone Traffic Management in Rehabilitation of M-2
    Adeel, Muhammad ;
    Khurshid, Muhammad Bilal
    2018-02-07 | PDF
    Pakistan has a population of over 199 million and total road network of approximately 264,400 kilometers that serve about 16.2 million vehicles of all types. According to WHO estimates, there were approximately 30,000 annual Road Crash Fatalities (RCF) in Pakistan in year 2010. Work zone crashes account for significant proportion of all traffic cra ...
  • Economic Impact Study for Public Ports
    Economic Impact Study for Public Ports
    Cambridge Systematics  ...
    2018-02-07 | PDF
    The Missouri Department of Transportation (MoDOT) commissioned this study to assess the economic role of public ports and waterways in supporting and enhancing the state and local economy. The key objectives of the study are to profile the economic activity of the public port facilities in Missouri; identify and assess port-dependent and port-benef ...
    Supporting Files
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