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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 4081 - 4100 of 36908 results
  • Coordination of Freeway Ramp Meters and Arterial Traffic Signals Phase IIB Field Implementation
    Coordination of Freeway Ramp Meters and Arterial Traffic Signals Phase II-B – Field Implementation
    Skabardonis, Alexander ;
    Lu, Xiao-Yun
    2021-05-01 | PDF
    The independent operations of freeway ramp meters and the adjacent arterial intersection traffic signals often causes queue spill back on the freeway on-ramps and the surface street network that result in activation of queue override, which negates the benefits of ramp metering. This is due to the lack of coordination between the two traffic contro ...
  • Analysis, Modeling, and Simulation (AMS) Case Studies of Connected and Automated Vehicle (CAV) Implementations Specific to the South Central Region [supporting datasets]
    Melson, Christopher ;
    Ma, Jiaqi
    2021-05-01 | PDF
    Connected and automated vehicles (CAVs) offer potentially transformative and far-reaching impacts to the transportation system. However, realized benefits will be directly tied to how well agencies prepare for these technologies. This report documents efforts that support CAV preparatory actions in Louisiana and includes: (1) conducting a stakehold ...
    Dataset Supporting Files
  • How Does Traffic or the Fear of It Affect Housing Affordability Examining the Effect of Traffic Impact Analysis on Housing Production and Affordability
    How Does Traffic, or the Fear of It, Affect Housing Affordability? Examining the Effect of Traffic Impact Analysis on Housing Production and Affordability
    Ding, Hao ;
    Taylor, Brian D.
    2021-05-01 | PDF
    Traffic impact analysis (TIA), which estimates the traffic impacts of proposed land development, tends to bias against higher density developments in urban areas where traffic is often congested and travel alternatives plentiful. This has important implications for housing supply and affordability, suburban sprawl, and private vehicle dependence. W ...
  • Evaluation of Pavement Service Life Extension Due to Asphalt Surface Treatment Interlayer Over SoilCement Base
    Evaluation of Pavement Service Life Extension Due to Asphalt Surface Treatment Interlayer Over Soil-Cement Base
    Khattak, Mohammad Jamal ;
    Baladi, Gilbert Y.
    2021-05-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) has been using asphalt surface treatment (AST) interlayers over soil-cement base courses for the last several years to control the reflective cracking of flexible pavements caused by soil-cement shrinkage. Even though DOTD has the specifications documents, the practice of AST interla ...
  • Design and Development of an Automated Truck Mounted Attenuator
    Design and Development of an Automated Truck Mounted Attenuator
    White, Elizabeth ;
    Mollenhauer, Michael A
    2021-05-01 | PDF
    Truck-Mounted Attenuators (TMAs) are energy-absorbing devices added to heavy shadow vehicles to provide a mobile barrier that protects work crews from errant vehicles entering active work zones. While the TMA is designed to absorb and/or redirect the energy from a colliding vehicle, there is still significant risk of injury to the TMA driver when s ...
  • Truck Platooning on Flexible Pavements in Illinois
    Truck Platooning on Flexible Pavements in Illinois
    Al-Qadi, Imad L ;
    Okte, Egemen
    2021-05-01 | PDF
    Truck platoons have many benefits over traditional truck mobility. Truck platoons have the potential to improve safety and reduce fuel consumption between 5% and 15%, based on platoon configuration. In Illinois, trucks carry more than 50% of freight tonnage and constitute 25% of the traffic on interstates. Therefore, expected fuel savings would be ...
  • Do Electricity Prices Affect Electric Vehicle Adoption
    Do Electricity Prices Affect Electric Vehicle Adoption?
    Bushnell, James ;
    Muehlegger, Erich
    2021-05-01 | PDF
    This report presents evidence that gasoline prices have a larger effect on demand for battery electric vehicles (BEVs) than do electricity prices in California. A spatially-disaggregated panel dataset of monthly BEV registration records was matched to detailed records of gasoline and electricity prices in California from 2014-2017, and the matched ...
  • Integrating Traffic Network Analysis and Communication Network Analysis at a Regional Scale to Support More Efficient Evacuation in Response to a Wildfire Event
    Integrating Traffic Network Analysis and Communication Network Analysis at a Regional Scale to Support More Efficient Evacuation in Response to a Wildfire Event
    Soga, Kenichi ;
    Comfort, Louise
    2021-05-01 | PDF
    As demonstrated by the Camp Fire evacuation, communications (city-to-city, city-to-residents) play important roles in coordinating traffic operations and safeguarding region-wide evacuation processes in wildfire events. This collaborative report across multiple domains (fire, communication and traffic), documents a series of simulations and finding ...
  • Development and Evaluation of MASH TL4 Guardrail System
    Development and Evaluation of MASH TL-4 Guardrail System
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2021-05-01 | PDF
    Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 4 (TL-4) compliant metal guardrail system. The researchers first developed several preliminary design concepts of the guardrail system, one of which was selected by the Texas Department of Transportation (TxDOT) f ...
  • Understanding the Transportation Mobility Needs for an Aging New Jersey Population Technical Brief
    Understanding the Transportation Mobility Needs for an Aging New Jersey Population [Technical Brief]
    Deka, Devajyoti ;
    Alexander, Karen
    2021-05-01 | PDF
    Older adults are considered transportation disadvantaged throughout the country because disabilities and low income prevent many of them from using transportation that can be conveniently used by younger people. New Jersey’s older adult population increased substantially during the past several decades and is expected to increase similarly in the f ...
  • Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks
    Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks
    Simonton, Eric ;
    Shearer, Christopher R
    2021-05-01 | PDF
    Concrete bridge decks in South Dakota have reduced services lives due to shrinkage cracking. This study evaluated the effects of varying concrete mix design parameters on shrinkage performance. Tested mix design changes include aggregate type (limestone and quartzite) and gradations (ASTM C33, Tarantula Curve, and 0.45 Power Curve), supplementary c ...
  • Development of Demand Estimation Models for the Virginia Department of Transportations Park and Ride Facilities
    Development of Demand Estimation Models for the Virginia Department of Transportation’s Park and Ride Facilities
    Xu, Yiqing ;
    Dougald, Lance E.
    2021-05-01 | PDF
    The construction and maintenance of park and ride lots represents a substantial public investment that if used judiciously can reduce congestion and emissions through the use of transit or the sharing of vehicle trips. With 297 lots scattered throughout Virginia, the Virginia Department of Transportation (VDOT) needs an approach for forecasting dem ...
  • Performance Base Testing for Erosion Prevention and Sediment Control EPSC Devices
    Performance Base Testing for Erosion Prevention and Sediment Control (EPSC) Devices
    Wilson, Christopher
    2021-05-01 | PDF
    To address excessive soil loss from roadway and other construction sites, several erosion prevention and sediment control practices exist. However, there is still a need for systematic performance evaluation methods that provide sound efficiency values for the different practices under a range of conditions. There is also the need for a transparent ...
  • Feasibility Study Alternatives to Prevent Settlements and Bumps at Bridge Approach
    Feasibility Study: Alternatives to Prevent Settlements and Bumps at Bridge Approach
    Kim, Seunghee ;
    Eun, Jongwan
    2021-05-01 | PDF
    This project aims to examine the feasibility of improving the current design practice of the approach slab foundation in Nebraska and the alternative of using geosynthetic reinforcement of soils to prevent the bump issues near the end of bridge approaches via an in-depth numerical simulation study. A large-scale pullout test is also conducted as co ...
  • Implementation of Geosynthetic Reinforced Soil Integrated Bridge System GRSIBS Technology in Alabama
    Implementation of Geosynthetic Reinforced Soil – Integrated Bridge System (GRS-IBS) Technology in Alabama
    Anderson, J Brian ;
    Montgomery, Jack
    2021-05-01 | PDF
    Geosynthetic Reinforced Soil-Integrated Bridge Systems (GRS-IBS) use closely spaced layers of geosynthetic reinforcement and compacted granular backfill to directly support a bridge deck and blend the abutment and roadway approach for a smooth transition. These systems are designed for areas where a single span is sufficient to bridge over a gap in ...
  • Initial Investigation of Performance of Skewed Reinforcing in InvertedT Bridge Caps
    Initial Investigation of Performance of Skewed Reinforcing in Inverted-T Bridge Caps
    Roy, Satya Sapath ;
    Sawab, Jamshaid
    2021-05-01 | PDF
    Many reinforced concrete inverted-T bridge caps (ITBCs) are skew when two roads are not aligned perpendicularly and exceed the angle of 45 degrees based on the construction requirements. The Texas ITBCs are designed using the traditional empirical procedures outlined in the Texas Department of Transportation (TxDOT) Bridge Design Manual (TxDOT BDM) ...
  • Unbound Recycled Materials Database for MnPAVEFlexible
    Unbound Recycled Materials Database for MnPAVE-Flexible
    Zammarchi, Mattia ;
    Tompkins, Derek
    2021-05-01 | PDF
    This report documents the development of an electronic dataset describing field and laboratory performance of unbound bases from 106 road sections containing recycled materials in Minnesota. This dataset provides a compact view of backcalculated layer properties (from falling-weight deflection data) per road section. This view includes summary stat ...
  • Striping Materials Performance Curves Life Cycle Analysis
    Striping Materials Performance Curves – Life Cycle Analysis
    Cornejo, Ivan A
    2021-05-01 | PDF
    In this report, region-specific Retro-reflectivity Performance Curves are presented and discussed as a function of pavement marking materials, AADT, terrain, surface type, line color, line type, road bound direction, and road name. In addition, laboratory aging, and abrasion test results are presented and discussed. In addition to this written repo ...
  • Asphalt Mix Overlay Alternative for Low Volume Roads on the Local Transportation System
    Asphalt Mix Overlay Alternative for Low Volume Roads on the Local Transportation System
    Abbas, Ala R. ;
    Nazzal, Munir
    2021-05-01 | PDF
    This research project aimed to identify or develop a practical method for designing a well-performing hot mix asphalt (HMA) for use on low-volume local roads with severe cracking that can be produced in existing asphalt plants and can be placed using conventional paving equipment available in Ohio. This research project was conducted in two phases. ...
  • Development of a Tack Coat Quality Control Program for Mitigating Delamination in Asphalt Pavement Layers
    Development of a Tack Coat Quality Control Program for Mitigating Delamination in Asphalt Pavement Layers
    Kim, Y Richard ;
    Sudarsanan, Nithin
    2021-05-01 | PDF
    The importance of proper bonding at the asphalt concrete (AC) layer interface cannot be overemphasized when discussing the performance of AC pavements. The primary objective of this research is to develop a set of test procedure and acceptance criterion that can be used in a tack coat quality control (QC) program to mitigate debonding in asphalt pa ...
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