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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 5841 - 5860 of 36958 results
  • 2019 Safety Belt Usage Survey in Kentucky
    2019 Safety Belt Usage Survey in Kentucky
    Lammers, Erin ;
    Agent, Kenneth R.
    2019-09-01 | PDF
    The objective of the survey summarized in this report was to establish a statewide safety belt usage rate in Kentucky for 2019. This rate can be compared to those determined from previous surveys. The 2019 statewide survey documents the continued effect associated with law enforcement, related education, and general public attitude.
  • The Cost of Roadway Construction and Maintenance in New Jersey Final Report
    The Cost of Roadway Construction and Maintenance in New Jersey: Final Report
    Carnegie, Jon A.
    2019-09-01 | PDF
    In today’s fiscally constrained funding environment, cost efficiency in highway construction and maintenance is an important goal for transportation agencies nationwide. This research study estimated the average cost per-lane mile for roadway construction projects on State-owned roadways during a four-year analysis period; benchmarked New Jersey ro ...
  • PERCEPT Indoor Navigation System for Visually Impaired Beta Study
    PERCEPT Indoor Navigation System for Visually Impaired: Beta Study
    Ganz, Aura ;
    Schafer, James
    2019-09-01 | PDF
    Independent navigation through unfamiliar indoor spaces is beset with barriers for blind and visually impaired (BVI) individuals. A task that is spontaneous for people without disabilities has to be planned and coordinated with other individuals for the BVI population. Currently, there are no commercial systems that enable BVI users to independentl ...
  • Metropolitan Planning Organization MPO and Transit Agency Planning Coordination Summary
    Metropolitan Planning Organization (MPO) and Transit Agency Planning Coordination [Summary]
    Kramer, Jeffrey ;
    Pessaro, Brian
    0000-01-01 | PDF
    University of South Florida researchers surveyed all MPOs in the state of Florida and most of the local transit agencies to examine the current state of planning coordination between them regarding LRTPs and TDPs.
  • Load and Resistance Factor Design LRFD Resistance Factors for Tip Grouted Drilled Shafts
    Load and Resistance Factor Design (LRFD) Resistance Factors for Tip Grouted Drilled Shafts
    Mullins, Gray ;
    Gunaratne, Manjriker
    2019-09-01 | PDF
    Pressure grouting beneath the tip of drilled shafts, also known as postgrouting, has been used for more than fifty years throughout the world and has been shown to be an effective means to enhance both the usable and ultimate end bearing resistance. In short, postgrouting is a form of compaction grouting beneath the shaft tip (performed after concr ...
  • Truck Taxonomy and Classification Using Video and WeighInMotion WIM Technology Summary
    Truck Taxonomy and Classification Using Video and Weigh-In-Motion (WIM) Technology [Summary]
    Ranka, Sanjay ;
    Rangarajan, Anand
    2019-09-01 | PDF
    University of Florida researchers developed an automated system for detection and classification of trucks from high resolution video.
  • CORS 911 Continuously Operating Reference Stations for the Bayou Corne Sinkhole
    CORS 911: Continuously Operating Reference Stations for the Bayou Corne Sinkhole
    Kent, Joshua D. ;
    Cavell, Anthony
    2019-09-01 | PDF
    The sinkhole associated with the Napoleonville salt dome in Assumption Parish, Louisiana, near Bayou Corne, threatened the stability of Highway 70–a state-maintained route. In order to mitigate any potential damaging effects to the highway and address issues of public safety, a program of monitoring, decision support, and research was implemented t ...
  • MnDOT Guidance Manual for Potentially Acid Generating Materials in Northern Minnesota
    MnDOT Guidance Manual for Potentially Acid Generating Materials in Northern Minnesota
    Eisen, K ;
    Blair, M
    2019-09-01 | PDF
    This manual provides guidance for methods of evaluating projects to assess the potential of encountering acid-generating materials in northern Minnesota. Methods for field reconnaissance, preliminary testing, characterization sampling efforts, interpretation of results, approaches for mitigation, and approaches for project monitoring are included.
  • Traffic Data Input for Mechanistic Empirical Pavement Design Guide MEPDG for Tennessee
    Traffic Data Input for Mechanistic Empirical Pavement Design Guide (MEPDG) for Tennessee
    Onyango, Mbakisya ;
    Owino, Joseph
    2019-09-01 | PDF
    Traffic loading is one of the key inputs for the structural design and analysis of pavement structures using both the AASHTO Guide for Pavement Design (1993) and the Pavement Mechanistic-Empirical Design (PMED) Guide. Traffic data provides necessary information in terms of traffic load distributions, intensity and number of repetitions. PMED requir ...
  • CostEffectiveness of Converting Signalized Arterials to FreeFlow Facilities
    Cost-Effectiveness of Converting Signalized Arterials to Free-Flow Facilities
    Qiao, Yu ;
    Shellhamer, Nathaniel
    2019-09-01 | PDF
    Traffic signals on four-lane divided signalized arterials impair mobility and exacerbate traffic congestion, driver frustration, crash risk, and overall user and community costs. This study examined the economic feasibility of converting this roadway type to free- flow corridors. A free-flowing facility does not refer to a freeway, but rather, a fa ...
  • Current Policies throughout the Nation for Pedestrian Hybrid Beacon PHB Installation
    Current Policies throughout the Nation for Pedestrian Hybrid Beacon (PHB) Installation
    DeLorenzo, Stacey S ;
    Jiang, Min
    2019-09-01 | PDF
    With increased interest in Pedestrian Hybrid Beacon (PHB) use across the United States, including in Illinois, it is necessary to provide a comprehensive analysis for PHB application nationwide, including current control standards, practice experience, and concerns in all states. Thus, using the official documents of each state and additional infor ...
  • Synthesis of Precast Bridge Column Designs
    Synthesis of Precast Bridge Column Designs
    Fawaz, Ghassan ;
    Murcia-Delso, Juan
    2019-09-01 | PDF
    Bridge prefabrication minimizes on-site operations and closure times, and can also contribute to improving the quality and durability of bridge elements as well as reducing the environmental impact of bridge construction. To date, bridge prefabrication has mainly focused on superstructure elements. The use of prefabricated substructure elements can ...
  • Durability and Inspection of Hybrid Composite Beams
    Durability and Inspection of Hybrid Composite Beams
    Balakumaran, Soundar S G ;
    Sharp, Stephen R.
    2019-09-01 | PDF
    The ability to inspect reasonably and ensure the durability of hybrid composite beams (HCBs) is of concern to transportation agencies. In case of infiltration of chloride-laden water through the fiber-reinforced polymer (FRP) shell of an HCB, tension reinforcement strands in the bottom flange will be subject to corrosion, thus severely affecting th ...
  • Mapping the Wolverine Way Identifying Conservation Corridors and Transboundary Linkages in the Canadian Crown of the Continent Region
    Mapping the Wolverine Way: Identifying Conservation Corridors and Transboundary Linkages in the Canadian Crown of the Continent Region
    Clevenger, Anthony P.
    2019-09-01 | PDF
    The Canadian Crown of the Continent (CCoC) is one of three zones where wolverines can move between Canada and the US, providing the last links for recruitment and ultimately gene flow to the highly fragmented population in the US Rocky Mountains. However, a combination of rapidly expanding logging, energy development and motorized recreation, along ...
  • Macro Synthetic Fiber Reinforcement for Improved Structural Performance of Concrete Bridge Girders
    Macro Synthetic Fiber Reinforcement for Improved Structural Performance of Concrete Bridge Girders
    Diaz, G Acosta ;
    Hamilton, H. R.
    2019-09-01 | PDF
    In prestressed bridge girders, end region reinforcement is used to control cracking caused by high tensile stresses that occur due to prestress transfer. Partial strand debonding and additional mild steel reinforcement are commonly used to control end region cracking. In some cases, these measures do not effectively control cracking, resulting in c ...
  • Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects Project Summary
    Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects [Project Summary]
    Tsapakis, Ioannis ;
    Holik, William
    2019-08-31 | PDF
    The Highway Safety Improvement Program (HSIP) aims to reduce the number and severity of fatalities and serious injury crashes on all public roads by implementing highway safety improvement projects. Over the last few years, particular emphasis has been placed on employing advanced safety predictive methods and tools.
  • Strategic Investment Decisions on Highway Improvement Projects
    Strategic Investment Decisions on Highway Improvement Projects
    Islam, Mouyid Bin ;
    Pande, Anurag
    2019-08-31 | PDF
    Quantitative safety is now being recognized as an essential element in project selection process at the planning phase. Quantitative evaluation of safety performance of particular roadway facilities, for example, segments and intersections, is critical to understand where safety concerns need to be addressed on a priority basis. A process that prov ...
  • Evaluation of Highway Safety Improvement Projects and Countermeasures Project Summary
    Evaluation of Highway Safety Improvement Projects and Countermeasures [Project Summary]
    Tsapakis, Ioannis ;
    Sharma, Sushant
    2019-08-31 | 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 ...
  • Research on HighRAP Asphalt Mixtures With Rejuvenators Phase II
    Research on High-RAP Asphalt Mixtures With Rejuvenators – Phase II
    Fatmehsari, Hamzeh Haghshenas ;
    Nsengiyumva, Gabriel Mukristu
    2019-08-31 | PDF
    A previous study by the authors have demonstrated effectiveness of three rejuvenators: R1 (triglyceride/fatty acid: agriculture-tech based), R2 (aromatic extract: petroleum-tech based), and R3 (tall oil: green-tech based) on rejuvenating properties of the aged binder. In that study, it was observed that the rejuvenators made high-RAP mixtures softe ...
  • Examination of the Variability in Grout Test Results
    Examination of the Variability in Grout Test Results
    Ahn, Il-Sang ;
    Friend, Trenton
    2019-08-31 | PDF
    Keyway grouting is an operation that connects decked bulb-tee girders into one system. The quality of grout should be well maintained through reliable material test procedures. Due to the issues of discrepancy and variability, there have been several cases in which grout materials did not satisfy the compressive strength standard specified in the D ...
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