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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 5421 - 5440 of 36022 results
  • 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 ...
  • An Analysis of Accessibility Social Interaction and ActivityTravel Fragmentation in California
    An Analysis of Accessibility, Social Interaction, and Activity-Travel Fragmentation in California
    McBride, Elizabeth C ;
    Davis, Adam W.
    2019-08-31 | PDF
    Fragmentation of activities and travel is defined here as the multiple sequencing of many relatively short activities and trips that happen in a person's daily schedule. These are combined with much longer activities and travel to form a complete schedule of activities and travel by each observed individual. Fragmentation of activity-travel schedul ...
  • Verification of ASR Resistance Property of the Selected Concrete Mix Designs by the Precast Industries in Texas Project Summary
    Verification of ASR Resistance Property of the Selected Concrete Mix Designs by the Precast Industries in Texas: Project Summary
    Mukhopadhyay, Anol ;
    Liu, Kai-Wei
    2019-08-31 | PDF
    Researchers verified the ASR resistance property of the selected concrete mix designs of bridge girders by the precast producers (PCPs) in Texas by applying the developed combined performance-based approach. The specific objectives were: • Reproduce the selected precast mixes in the laboratory and test by the ACCT method to determine if the mixes a ...
  • Development of Crash Reduction Factors for BicycleRelated Safety Countermeasures
    Development of Crash Reduction Factors for Bicycle-Related Safety Countermeasures
    Grembeck, Offer ;
    Griswold, Julia
    2019-08-31 | PDF
    Developing quality California-specific crash modification factors (CMFs) for bicycle-related safety countermeasures will support practitioners in making more informed decisions about infrastructure improvement projects. The researchers identified a comprehensive list of countermeasures, identified existing CMFs and reviewed their quality and applic ...
  • Making Tolling Transparent Analyzing Processes Used to Allocate Distribute Toll Highway Revenue in Multiple States
    Making Tolling Transparent: Analyzing Processes Used to Allocate & Distribute Toll Highway Revenue in Multiple States
    Weinreich, David ;
    Scott, Thomas
    2019-08-31 | PDF
    Transportation finance has become increasingly unreliable in recent years, due to the declining revenue available from the motor fuel tax, increasing auto efficiency, and political reluctance to raise taxes. Some states have relied on toll revenue and other user fees to overcome these revenue challenges. However toll roads are often unpopular, due ...
  • Development of a RealTime Roadway Debris Hazard Spotting Tool Using Connected Vehicle Data to Enhance Roadway Safety and System Efficiency
    Development of a Real-Time Roadway Debris Hazard Spotting Tool Using Connected Vehicle Data to Enhance Roadway Safety and System Efficiency
    Concas, Sisinnio ;
    Kamrani, Mohsen
    2019-08-31 | PDF
    Using the information residing in connected vehicle Basic Safety Message (BSM) data, this project develops an algorithm that is capable of identifying the location of unwanted objects, i.e. debris on road segments. Vehicles’ lateral accelerations are used to detect lane changing and swerving behaviors to create density maps that pinpoint the locati ...
  • Environmental and Cost Effectiveness of Partially Grouted Riprap for Scour Countermeasure
    Environmental and Cost Effectiveness of Partially Grouted Riprap for Scour Countermeasure
    Abboud, Bechara ;
    Coe, Joseph
    2019-08-30 | PDF
    Partially grouted riprap (PGR) as a scour countermeasure is relatively new in the United States but has been used widely in Europe. Currently in Pennsylvania, the selection of appropriate scour countermeasures for bridge foundation protection have in general been limited in their applications to mainly dumped or hand-placed riprap, which can be dis ...
  • CurbRamp Design CRD and Inspection System CIS
    Curb-Ramp Design (CRD) and Inspection System (CIS)
    Waters, S ;
    Velan, P
    2019-08-30 | PDF
    Inaccessible routes between locations can be a major barrier to participation for people with physical disabilities. Even with regulations, inaccessible sidewalks continue to create problems for wheelchair users. Existing technologies do not offer a comprehensive solution to the measurement, data collection, and information storage and display of c ...
  • Prioritizing High Collision Concentration Locations HCCLs identified using Pedestrian Safety Monitoring Report Tool
    Prioritizing High Collision Concentration Locations (HCCLs) identified using Pedestrian Safety Monitoring Report Tool
    Lu, Jiajian ;
    Medury, Aditya
    2019-08-24 | PDF
    The Pedestrian Safety Improvement Program is an effort of the California Department of Transportation (Caltrans) to identify and address problems with regard to pedestrian safety in California, with the long-term goal of substantially reducing pedestrian fatalities and injuries in California. The research presented in this report explores different ...
  • Improving Replacement Cost Data for NCDOT Highway Bridges
    Improving Replacement Cost Data for NCDOT Highway Bridges
    Whelan, Matthew J ;
    Cavalline, Tara L
    2019-08-23 | PDF
    One of the primary functions of a bridge management system (BMS) is to inform data-driven, risk-based decision making by forecasting future network level needs and anticipating the costs and benefits of bridge replacement, rehabilitation, and preservation actions. Of these actions, bridge replacement projects account for the majority of the current ...
  • Dissecting the Safety Benefits of Protected Intersection Design Features [supporting datasets]
    Christofa, Eleni ;
    Knodler Jr., Michael A.
    2019-08-23 | ZIP
    Protected intersections are an integral component of Complete Streets and are used to facilitate safe crossings for bicyclists and pedestrians at intersections. Their placement is ideal after segments with protected bike lanes where drivers might not be aware of bicyclists’ presence. Protected intersections have the ability to increase drivers’ awa ...
    Dataset Supporting Files
  • Final 50 Feet of the Urban Goods Delivery System: Pilot Test of an Innovative Improvement Strategy [supporting dataset]
    Goodchild, Anne V.
    2019-08-22 | ZIP
    Data was collected over a total of 20 days, covering the period both before and after the locker installation at the Seattle Municipal Tower. Data collectors at the loading bay systematically tracked the number of trucks, total truck dwell time, truck parking location, the number and size distribution of parcels delivered, the number of packages pi ...
    Dataset Supporting Files
  • Illinois Highway Materials Sustainability Efforts 2018
    Illinois Highway Materials Sustainability Efforts 2018
    Morse, Kelly L.
    2019-08-20 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Exploration of Factors Impacting the Successful Adoption of External Vehicle Interfaces
    Exploration of Factors Impacting the Successful Adoption of External Vehicle Interfaces
    Reimer, Bryan
    2019-08-20 | PDF
    Researchers, auto manufacturers, technologists and governmental agencies have expressed concern that vehicle automation may necessitate the introduction of added displays to indicate vehicle intent in vehicle-to-pedestrian interactions. Displays of various types have been demonstrated on prototype systems with limited specification around the need ...
  • Commuter Mobility versus Workzone Safety An Empirical Study using Data Mining of Anonymous User Generated Trip Information
    Commuter Mobility versus Work-zone Safety: An Empirical Study using Data Mining of Anonymous User Generated Trip Information
    Louis, Joseph ;
    Fiawoyife, Kenny
    2019-08-19 | PDF
    The two primary considerations for highway work-zones are its effect on commuter mobility and worker safety which are often spoken of together. However, it must be noted that they conflict with each other. This research aims to study this generally inverse relationship and develop a Decision Support System (DSS) for work-zone traffic control for st ...
  • Review of Suicide Intervention Training Programs
    Review of Suicide Intervention Training Programs
    Gabree, Scott H. ;
    Hiltunen, Danielle
    2019-08-19 | PDF
    Nearly one-third of all rail-related fatalities in the U.S. result from an intentional act of suicide. Rail carrier-based strategies to prevent these incidents are not well understood, and empirical evidence of the effectiveness of known strategies is currently very limited. One such strategy is suicide intervention training to educate rail staff a ...
  • Qualify High Frequency GPR for Asphalt Mixture Construction
    Qualify High Frequency GPR for Asphalt Mixture Construction
    Wilson, Bryan ;
    Sebesta, Stephen
    2019-08-19 | PDF
    Goals: Demonstrate shadow QA on projects, perform lab sensitivity analysis, explore forensic applications, and develop test procedure.
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