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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 6381 - 6400 of 36958 results
  • Evaluating Equity Issues for Managed Lanes Methods for Analysis and Empirical Results
    Evaluating Equity Issues for Managed Lanes: Methods for Analysis and Empirical Results
    Cirillo, Cinzia ;
    Vicente, Javier Bas
    2019-03-01 | PDF
    Transportation planning decisions can have significant and diverse equity impacts (Litman, 2002). In particular, congestion and road pricing have raised equity concerns. Notably, the toll imposed on Managed Lanes on US highways affects drivers’ income. This is especially true for low-earning individuals, who devote a large portion of their availabl ...
  • BeltLine Bicyclist Facility Preferences and Effects on Increasing Trips
    BeltLine Bicyclist Facility Preferences and Effects on Increasing Trips
    Watkins, Kari E. ;
    Circella, Giovanni
    2019-03-01 | PDF
    The objectives of this study were to investigate perceptions of users and potential users of bicycle infrastructure and to investigate the impact of multi-use paths on bicycle trips. Data were collected through a before-and-after survey in 2017 and 2018 (wave 1 N=1,335, wave 2 N=713) of residents near the Eastside Atlanta BeltLine extension and the ...
  • Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning Phase II
    Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning, Phase II
    Zhang, Qiong ;
    Lu, Qing
    2019-03-01 | PDF
    Stormwater runoff can cause both flooding and the spread of pollutants, so it is important that it be managed effectively. This project investigates the watershed scale implementation of green infrastructure: technologies that reduce the imperviousness and promote the retention and treatment of the runoff at the source, rather than move the water t ...
  • Laboratory Performance Evaluation of Pavement Preservation Alternatives
    Laboratory Performance Evaluation of Pavement Preservation Alternatives
    Ali, Ayman ;
    Mehta, Yusuf
    2019-03-01 | PDF
    This paper introduces a laboratory procedure for evaluating the performance benefits of pavement preservation alternatives and determining the least acceptable pavement conditions on which such treatments can be applied effectively. Two pavement preservation alternatives were evaluated: chip seal and microsurfacing. In addition, this paper presente ...
  • Understanding the Impact of Local Policies and Initiatives on PlugIn Electric Vehicle Adoption an InDepth Study of the Sacramento Region
    Understanding the Impact of Local Policies and Initiatives on Plug-In Electric Vehicle Adoption – an In-Depth Study of the Sacramento Region
    Hardman, Scott ;
    Jang, Nora
    2019-03-01 | PDF
    The survey project described here is intended to be the beginning of a multi-year project on the effectiveness of various activities in growing consumer interest in purchasing BEVs in the Sacramento region. This survey in Sacramento shows that engagement in PEVs is moderate, based on the following results: 50% of respondents had seen some PEV-relat ...
  • Ways to Consider Driverless Vehicles in Virginia Long Range Travel Demand Models
    Ways to Consider Driverless Vehicles in Virginia Long Range Travel Demand Models
    Miller, John S. ;
    Kang, Di
    2019-03-01 | PDF
    Regional travel demand models are an institutionalized element of the transportation planning process and require multiple years to develop, calibrate, and deploy. Because transportation planners are being asked immediately how a new technology, i.e., driverless vehicles (DVs), may affect travel demand, this study, using a case study approach with ...
  • Pavement Rehabilitation Strategy Course Development
    Pavement Rehabilitation Strategy Course Development
    Ozer, Hasan ;
    Al-Qadi, Imad L
    2019-03-01 | PDF
    Pavement rehabilitation and preservation treatments have become standard practice for state and local transportation agencies. The ultimate goals include maintaining a safe and reliable level of service for all users, maximizing pavement service life, and optimizing budget allocations for infrastructure construction projects. The essential key to m ...
  • Characterization of Crushed Base Materials in Wyoming Research Brief 2019
    Characterization of Crushed Base Materials in Wyoming [Research Brief - 2019]
    Ng, Kam ;
    Mebrahtom, Dawit
    2019-03-01 | PDF
    To improve the pavement design and construction in Wyoming, the Wyoming Department of Transportation (WYDOT) is adopting the Mechanistic-Empirical Pavement Design Guide (MEPDG). A full implementation of MEPDG requires the characterization of local crushed base materials. In this research, laboratory experiments on resilient modulus were performed t ...
  • Enhancement of MechanisticEmpirical Pavement Design Guide for Roadway Design and Construction in the State of Wyoming
    Enhancement of Mechanistic-Empirical Pavement Design Guide for Roadway Design, and Construction in the State of Wyoming
    Ng, Kam W. ;
    Ksaibati, Khaled
    2019-03-01 | PDF
    To facilitate the implementation of Mechanistic-Empirical Pavement Design Guide (MEPDG) in Wyoming, this research investigated the relationships between subgrade resilient modulus (Mr) and the dynamic cone penetration (DCP) and the standard penetration test (SPT) results, selected three best subgrade Mr predictive models based on Mr and distress es ...
  • Risk Awareness and Perception Training Using VR Headsets The Validation of VR Headsets to Measure Hazard Anticipation Behaviors
    Risk Awareness and Perception Training Using VR Headsets: The Validation of VR Headsets to Measure Hazard Anticipation Behaviors
    Fitzpatrick, Cole ;
    Samuel, Siby
    2019-03-01 | PDF
    The objective of the current study is to evaluate the use of virtual reality (VR) headsets to measure driving performance for driving simulation studies and training. This is desirable because they are several orders of magnitude less expensive and, if validated, could greatly extend the powers of simulation. Out of several possible measures of per ...
  • Particle Size Distribution and Gross Solids in Ohios Stormwater Runoff Summary
    Particle Size Distribution and Gross Solids in Ohio’s Stormwater Runoff [Summary]
    Ohio. Department of Transportation. Office of Statewide Planning and Research
    2019-03-01 | PDF
    The Ohio Department of Transportation (ODOT) is required to treat stormwater from some roads to comply with Ohio Environmental Protection Agency’s Construction General Permit. In order to effectively design stormwater controls, quantification of the sediment and t rash in stormwater runoff from roads is needed. This work will inform the design of p ...
  • Using Pavement Texture to Screen and Target Annual Skid Number Assessment
    Using Pavement Texture to Screen and Target Annual Skid Number Assessment
    Allen, Charles ;
    Peterson, Tim
    2019-03-01 | PDF
    The purpose of this study is to develop an understanding of how pavement texture data can be used to inform roadway safety and develop a more targeted approach to Skid Number (SN) assessment with focus on high risk areas. Pavement texture data is a new data source for the Utah Department of Transportation (UDOT). Skid data and pavement texture data ...
  • Mobile Technologies for Assessment of Winter Road Conditions
    Mobile Technologies for Assessment of Winter Road Conditions
    Minge, Erik ;
    Gallagher, Mark
    2019-03-01 | PDF
    Mobile RWIS technologies are still relatively new to the market, with only a few early-adopting agencies deploying them, primarily in testing situations. This study provides a comprehensive and comparative analysis of four commercially available mobile RWIS sensors. The sensors in the study include: Lufft’s MARWIS, Teconer’s RCM411, High Sierra’s M ...
  • A Framework to Determine Purpose and Need for Increased Travel Options in the Megaregion for Vulnerable NonUrban Communities
    A Framework to Determine Purpose and Need for Increased Travel Options in the Megaregion for Vulnerable Non-Urban Communities
    Lewis, Carol Abel ;
    Goodwin, Gwendolyn C.
    2019-03-01 | PDF
    Texas’ largest cities, Houston, San Antonio, Dallas and Austin form a triangle in the state’s interior. Although cities are known for poverty pockets, many low income residents are not concentrated in central cities. Travel for this population is predominantly by private vehicle and is more expensive than for urban residents with access to public t ...
  • Field Implementation of HighVolume Recycled Materials for Sustainable Pavement Construction
    Field Implementation of High-Volume Recycled Materials for Sustainable Pavement Construction
    Khayat, Kamal H. ;
    Sadati, Seyedhamed
    2019-03-01 | PDF
    The objective of this study was to evaluate the feasibility of producing sustainable concrete materials for rigid pavement construction using high volume of recycled materials. The goal was to replace 50% of all solid materials in the concrete with recycled materials and industrial by-products. This included the replacement of cement with at least ...
  • Field Implementation and Monitoring of Behavior of Economical and CrackFree HighPerformance Concrete for Pavement and Transportation Infrastructure Constructions Phase II
    Field Implementation and Monitoring of Behavior of Economical and Crack-Free High-Performance Concrete for Pavement and Transportation Infrastructure Constructions – Phase II
    Khayat, Kamal H. ;
    Mehdipour, Iman
    2019-03-01 | PDF
    Economical and crack-free high-performance concrete (Eco-HPC) is a new class of environmentally friendly and cost-effective high-performance concrete (HPC) that is made of low binder content, high volume of supplementary cementitious materials (SCMs), and shrinkage mitigating materials. The initial phase of research that involved an extensive labor ...
  • FiberReinforced Concrete for Pavement Overlays MAP Brief
    Fiber-Reinforced Concrete for Pavement Overlays [MAP Brief]
    Roesler, Jeffery ;
    Bordelon, Amanda
    2019-03-01 | PDF
    The objectives of this MAP Brief are to provide pavement engineers with necessary information to apply fiber-reinforced concrete (FRC) to concrete overlays and determine the appropriate fiber-reinforcement performance values to be specified in a project and implemented into the structural design calculations for bonded and unbonded concrete overlay ...
  • Regressing Air Voids for Balanced HMA Mix Design Research Brief
    Regressing Air Voids for Balanced HMA Mix Design [Research Brief]
    West, Randy C.
    2019-03-01 | PDF
    The implementation of Superpave mix design strategies in the 1990s, industry professionals have successfully improved rutting resistance of hot mix asphalt (HMA) by specifying higher grades of asphalt binder and quality of aggregates. Currently, the primary mode of distress in HMA pavements is cracking, which can be caused by poor mix designs, incr ...
  • BirdLong Island Management Study Phase 1B Hydrodynamic Characterizations for BirdLong Island
    Bird-Long Island Management Study Phase 1B: Hydrodynamic Characterizations for Bird/Long Island
    Haas, Kevin ;
    Muscalus, Alexandra C.
    2019-03-01 | PDF
    Bird-Long Island, located between two channels in the Savannah River, contains cultural resources that are threatened by erosion. This study characterizes the hydrodynamics in the vicinity of the island with field measurements including velocity profiles of the river, long-term current wave profiling measured with Aquadopp current profilers, and sh ...
  • Field Aging and Oil Modification Study Research Brief
    Field Aging and Oil Modification Study [Research Brief]
    Bahia, Hussain U.
    2019-03-01 | PDF
    Asphalt pavements suffer physical and mechanical deterioration over time as asphalt binders age. The rate at which a binder ages depends on its composition and interactions with other mix design components, such as aggregate gradation, surface area and voids content. The ability to accurately estimate binder aging and the rate at which it causes pa ...
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