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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 1681 - 1700 of 35478 results
  • Evaluate the Impacts of Complete Streets Policy in Louisiana Tech Summary
    Evaluate the Impacts of Complete Streets Policy in Louisiana [Tech Summary]
    Bian, Ruijie “Rebecca”
    2023-06-01 | PDF
    The focus of this research project was to evaluate the impacts of the Complete Streets policy in Louisiana. The objectives of this research project included: (1) evaluating policy impacts to project scoping and delivery; (2) summarizing and evaluating what changes the agency has made in terms of documents, policies, staffing, training, etc. to adva ...
  • Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Anderson, J. Brian ;
    Davidson, James S.
    2023-06-01 | PDF
    The accuracy and applicability of existing methodologies and tools for load rating of corrugated metal culverts under shallow cover were thoroughly investigated through numerical modeling and field testing. The basis of three existing spreadsheet rating tools were investigated. Two existing culverts that are more than 80 years old and whose cover o ...
  • Pilot Pollinator Habitat at UDOT Rest Area in Perry Utah
    Pilot Pollinator Habitat at UDOT Rest Area in Perry, Utah
    Wheeler, Mindy ;
    Yeager, Becky
    2023-06-01 | PDF
    This report outlines the process by which a portion of the I-15 Perry Rest Area in northern Utah was modified to include a functional pollinator habitat suitable for public education, outreach and enjoyment, as well as to provide much needed habitat for local pollinators, many of whom have experienced serious declines in their populations. Converti ...
  • Stormwater Pond Maintenance and Wetland Management for Phosphorus Retention
    Stormwater Pond Maintenance, and Wetland Management for Phosphorus Retention
    Janke, Benjamin D ;
    Natarajan, Poornima
    2023-06-01 | PDF
    Reduction in phosphorus is critical because phosphate, a dissolved form of phosphorus, sustains algal and cyanobacteria growth and causes a wide range of water-quality impairments in the ponds and downstream waters including algal blooms, excess floating plants, taste, and odor problems. Many stormwater ponds and wetlands that treat stormwater appe ...
  • Development of GFRP Reinforced Single Slope Bridge Rail Brief
    Development of GFRP Reinforced Single Slope Bridge Rail [Brief]
    Freeman, Christina ;
    Consolazio, Gary R.
    2023-06-01 | PDF
    In the design of highway bridges in Florida, glass fiber reinforced polymer (GFRP) materials are starting to replace mild carbon steel as the basis for reinforcing structural concrete components. Whereas traditional steel rebar is susceptible to corrosion, GFRP rebar is not, and therefore the use of GFRP has the potential to reduce maintenance cost ...
  • Deployment of a Snowplow DriverAssist System
    Deployment of a Snowplow Driver-Assist System
    Davis, Brian ;
    Schwieters, Katelyn
    2023-06-01 | PDF
    Snowplow operators are often tasked with clearing snow from roadways under challenging conditions. One such situation is low visibility due to falling or blowing snow that makes it difficult to navigate, stay centered in the lane, and identify upcoming hazards. To support snowplow operators working in these conditions, University of Minnesota resea ...
  • Increasing Support for Innovative Traffic Solutions Summary
    Increasing Support for Innovative Traffic Solutions [Summary]
    Thompson, Scott ;
    Morris, Nichole
    2023-06-01 | PDF
    Public transportation agencies are constantly on the lookout for ways to reduce the number and severity of traffic crashes. One such solution is the Restricted Crossing U-turn, or RCUT, which has proven to be a safer alternative to traditional intersections on four-lane divided highways.
  • Evaluation of Liquefaction Induced Lateral Spread from Recent Alaska Earthquakes
    Evaluation of Liquefaction Induced Lateral Spread from Recent Alaska Earthquakes
    Yang, Zhaohui Joey ;
    Eng, C.
    2023-06-01 | PDF
    Widespread liquefaction and lateral spreading occurred after the 2002 M7.9 Denali fault earthquake. This provided a unique opportunity to evaluate lateral spreading displacement equations to areas of interior Alaska. The Newmark block analysis method and nonlinear solid-fluid coupled finite element models were used to assess the impact of seasonal ...
  • CDOT Cognitive Roadside Device Evaluation Study
    CDOT Cognitive Roadside Device Evaluation Study
    Lyon, Craig ;
    Vanlaar, Ward
    2023-06-01 | PDF
    This project evaluated the viability of using the Cognivue Thrive to detect cognitive and physical impairment of drivers due to drugs. The device was tested in Boulder, Colorado during April of 2023 and results were compared with a blood sample. The report discusses lessons learned from testing of the Cognivue Thrive including technological, legal, ...
  • Assessing Stormwater Infrastructure Capacity for Severe Storms Summary
    Assessing Stormwater Infrastructure Capacity for Severe Storms [Summary]
    Brenna, Erik ;
    Gulliver, John S.
    2023-06-01 | PDF
    MnDOT maintains a significant portion of the state’s storm- water infrastructure. Managing stormwater is important to pre-vent flooding and associated safety risks; impacts to the environ-ment; and damage to property, roads and bridges.
  • Usercentered Smart Traffic Sign Development Study
    User-centered Smart Traffic Sign Development Study
    Morris, Nichole L. ;
    Rajamani, Rajesh
    2023-06-01 | PDF
    Flaggers protect workers by providing temporary traffic control and maintaining traffic flow through a work zone. They are often the first line of defense to stop distracted, inattentive, or aggressive motorists from intruding into the work area. This project aims to develop an automated intrusion detection system to alert drivers who are unsafely ...
  • Screening of Asphalt Extenders and Recycling Agents
    Screening of Asphalt Extenders and Recycling Agents
    Castorena, Cassie ;
    Fried, Andrew
    2023-06-01 | PDF
    The objectives of this project are to: 1) develop recommendations for extender and recycling agent product approval and dosage selection; and 2) identify appropriate aging procedure(s) to simulate long-term oxidative aging coupled with test methods and parameters to characterize the cracking resistance of asphalt binders. Three NCDOT approved surfa ...
  • Traffic Safety Facts 2021 Data Pedestrians
    Traffic Safety Facts 2021 Data: Pedestrians
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    This fact sheet defines a pedestrian involved in a motor vehicle traffic crash as any person on foot, walking, running, jogging, hiking, sitting, or lying down. It excludes people on personal conveyances like roller skates, inline skates, skateboards, baby strollers, scooters, toy wagons, motorized skateboards, motorized toy cars, Segway-style devi ...
  • Traffic Safety Facts 2021 Data AlcoholImpaired Driving
    Traffic Safety Facts 2021 Data: Alcohol-Impaired Driving
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    Drivers are considered to be alcohol-impaired when their blood alcohol concentrations (BACs) are .08 grams per deciliter (g/dL) or higher. Thus, any fatal crash involving a driver with a BAC of .08 g/dL or higher is considered to be an alcohol-impaired-driving crash, and fatalities occurring in those crashes are considered to be alcohol-impaired-dr ...
  • Traffic Safety Facts 20122021 Data SchoolTransportationRelated Crashes
    Traffic Safety Facts 2012-2021 Data: School-Transportation-Related Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    A school-transportation-related crash is a motor vehicle traffic crash that directly or indirectly involves a school transportation vehicle that is either a school bus body type or a non-school-bus functioning as a school bus, transporting children to and from school or school-related activities. For the purposes of this fact sheet, school-age chil ...
  • Crash Report Sampling System CRSS Motor Vehicle Crash Data Collection
    Crash Report Sampling System (CRSS): Motor Vehicle Crash Data Collection
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    The National Highway Traffic Safety Administration has collected crash data since the early 1970s to support its mission to reduce motor vehicle crashes, injuries, and deaths on our Nation’s highways. The Crash Report Sampling System (CRSS) builds on the retired, long running National Automotive Sampling System General Estimates System (NASS GES). ...
  • Crash Investigation Sampling System CISS Motor Vehicle Crash Data Collection
    Crash Investigation Sampling System (CISS): Motor Vehicle Crash Data Collection
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    The National Highway Traffic Safety Administration has collected crash data since the early 1970s to support its mission to reduce motor vehicle crashes, injuries, and deaths on our Nation’s highways. The Crash Investigation Sampling System (CISS) builds on the retired, long running National Automotive Sampling System Crashworthiness Data System (N ...
  • Analysis of Local Bus Markets Phase III
    Analysis of Local Bus Markets, Phase III
    Devajyoti, Deka ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    This research is a follow-up of the Analysis of Local Markets Phase I and Phase II studies conducted by the Alan M. Voorhees Transportation Center during 2015-18. Whereas the primary objectives of the Phase I study were to examine both traffic (i.e., congestion) and air quality (i.e., emission) impacts of local buses, the primary objective of the P ...
  • Guidelines for Safer Pedestrian Crossings Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Guidelines for Safer Pedestrian Crossings: Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Stern, Raphael ;
    Li, Tianyi
    2023-06-01 | PDF
    Many factors influence an individual driver’s decision to yield or not yield to individual pedestrians attempting to cross the road at an unsignalized crossing. This study collects observational data from more than 3,300 crossing events at 18 intersections in Minnesota to further our understanding of what factors positively influence driver yieldin ...
  • Analysis of Local Bus Markets Phase III Technical Brief
    Analysis of Local Bus Markets, Phase III [Technical Brief]
    Deka, Devajyoti ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    Despite having an extensive network of public transit, traffic congestion and transportation-related greenhouse gas (GHG) emissions are significant concerns in New Jersey. This research examines the GHG impacts of NJ TRANSIT local buses in the greater Newark area service region. It involved a large-scale onboard survey of bus riders on 40 NJ TRANSI ...
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