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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 7141 - 7160 of 36104 results
  • Evaluating Bicycle Pedestrian Transit and Economic Data Collection Needs and Measures of Effectiveness in Pennsylvania
    Evaluating Bicycle, Pedestrian, Transit and Economic Data Collection Needs and Measures of Effectiveness in Pennsylvania
    Magalotti, Mark J. ;
    Deitrick, Sabina E.
    2018-02-06 | PDF
    The purpose of this research project was to evaluate the current data collection procedures for bicycle and pedestrian projects utilized by the Pennsylvania Department of Transportation (PennDOT) and Pennsylvania's Metropolitan Planning Organizations (MPOs) and Rural Planning Organizations (RPOs). The evaluation has assessed how additional data col ...
  • Emissions from Plugin Hybrid Electric Vehicle PHEV During Real World Driving Under Various Weather Conditions
    Emissions from Plug-in Hybrid Electric Vehicle (PHEV) During Real World Driving Under Various Weather Conditions
    Jung, Heejung ;
    Li, Chengguo
    2018-02-02 | PDF
    Exposure to particulate matter (PM) and pollutant gas (NOx) is associated with increasedcardiopulmonary morbidity and mortality. Mobile source emissions contribute to PM and NOxemissions significantly in urban areas. Hybrid Electric Vehicles (HEVs) plays an important role to reduce emissions. While sales of electric vehicles has been increasing, el ...
  • Evaluating Environmental Impact of Traffic Congestion in Real Time Based on Sparse Mobile Crowdsourced Data
    Evaluating Environmental Impact of Traffic Congestion in Real Time Based on Sparse Mobile Crowd-sourced Data
    Hao, Peng ;
    Wang, Chao
    2018-02-02 | PDF
    Traffic congestion at arterial intersections and freeway bottlenecks degrades the air quality and threatens the public health. Conventionally, air pollutants are monitored by sparsely-distributed Quality Assurance Air Monitoring Sites. Sparse mobile crowd-sourced data, such as cellular network and Global Positioning System (GPS) data, contain large ...
  • Safety Evaluation of Destination Lighting at StopControlled Cross Intersections Brief
    Safety Evaluation of Destination Lighting at Stop-Controlled Cross Intersections [Brief]
    Hallmark, Shauna L. ;
    Goswamy, Amrita
    2018-02-02 | PDF
    Unlit or inadequately lit intersections reduce the ability of drivers to recognize upcoming intersections during nighttime hours. Drivers also face difficulty in properly negotiating the intersection because lack of adequate lighting increases the likelihood of not detecting conflicting vehicles or pedestrians. In general, the nighttime crash rate ...
  • Crash Modification Factors for Chevrons in Iowa
    Crash Modification Factors for Chevrons in Iowa
    Hallmark, Shauna L. ;
    Goswamy, Amrita
    2018-02-02 | PDF
    Although chevron alignment signs have been utilized for some time along horizontal curves, their effectiveness is not well documented. The Crash Modification Factors Clearinghouse includes crash modification factors (CMFs) for chevrons from 0.41 to 1.92 (FHWA 2015). The lack of documentation on the effectiveness of chevrons and the range of values ...
  • TRANSPORTATION RESEARCH IMPLEMENTATION MANAGEMENT DEVELOPMENT OF PERFORMANCE BASED PROCESSES METRICS AND TOOLS
    TRANSPORTATION RESEARCH IMPLEMENTATION MANAGEMENT : DEVELOPMENT OF PERFORMANCE BASED PROCESSES, METRICS, AND TOOLS
    Amekudzi-Kennedy, Adjo ;
    Clark, Russell
    2018-02-02 | PDF
    The objective of this study is to develop an evidence‐based research implementation database and tool to support research implementation at the Georgia Department of Transportation (GDOT).  A review was conducted drawing from the (1) implementation science (IS); (2) intellectual capital and non‐financial public agency performance (ICNPAP), and (por ...
  • Virtual Road Safety Audits Recommended Procedures for Using Driving Simulation and Technology to Expand Existing Practices
    Virtual Road Safety Audits: Recommended Procedures for Using Driving Simulation and Technology to Expand Existing Practices
    Noyce, David A. (David Alan), 1961- ;
    Chitturi, Madhav V.
    2018-02-02 | PDF
    One approach that has been proposed to address the limitations of the current reactive safetymonitoring approaches is the use of road safety audits (RSAs). As part of an RSA, the existing or expected characteristics and traffic conditions of a location are evaluated using multiple points of view to identify what could be the factors causing the saf ...
  • BEST PRACTICES TO SUPPORT AND IMPROVE PAVEMENT MANAGEMENT SYSTEMS FOR LOWVOLUME PAVED ROADS PHASE I
    BEST PRACTICES TO SUPPORT AND IMPROVE PAVEMENT MANAGEMENT SYSTEMS FOR LOW-VOLUME PAVED ROADS – PHASE I
    Hafez, Marwan ;
    Ksaibati, Khaled
    2018-02-02 | PDF
    The Colorado Department of Transportation (CDOT) has been trying to identify the most effective methods for managing low-volume roads (LVRs). These roads are facing multiple challenges including: reductions in maintenance budgets, impact of industrial activities, and potentially not receiving the most cost effective treatments. Considerable savings ...
  • Implementation of a Testing Protocol for Approving Alternative Supplementary Cementitious Materials SCMs Natural Minerals and Reclaimed and Remediated Fly Ashes
    Implementation of a Testing Protocol for Approving Alternative Supplementary Cementitious Materials (SCMs): Natural Minerals and Reclaimed and Remediated Fly Ashes
    Al-Shmaisani, Saif ;
    Kalina, Ryan
    2018-02-02 | PDF
    Supplementary cementitious materials (SCMs) provide many benefits to concrete mixtures in terms of cost, long term strength, and durability. Class F fly ash is the most widely used SCM in Texas, but its availability is dwindling while demand is increasing. Given the importance of Class F fly ash as a means to improve concrete durability, it is impo ...
  • Coordinated Traffic Incident and Congestion Management TIMCM Mitigating Regional Impacts of Major Traffic Incidents in the Seattle I5 Corridor
    Coordinated Traffic Incident and Congestion Management (TIM-CM) : Mitigating Regional Impacts of Major Traffic Incidents in the Seattle I-5 Corridor
    Haselkorn, Mark ;
    Yancey, Sarah
    2018-02-02 | PDF
    Within the Seattle metropolitan area, traffic incident management (TIM) operations provide a multi-jurisdictional and coordinated strategy to detect, respond to, and clear traffic incidents so that traffic flow can be restored quickly and safely. There is a need to extend TIM to include congestion management (CM), a complex activity for managing in ...
  • Economic Development Impact of Corridor Improvements
    Economic Development Impact of Corridor Improvements
    Chacon-Hurtado, Davis ;
    Yang, Ruiman
    2018-02-02 | PDF
    In recent years, the Indiana Department of Transportation (DOT) and other state transportation agencies have increasingly implemented non-capacity expansion projects or strategies due to their benefits in improving flow, safety, and reducing delay in the transportation network at low capital, operations, and maintenance cost. The quantification of ...
  • Electric Vehicle Grid Experiments and Analysis
    Electric Vehicle Grid Experiments and Analysis
    Raustad, Richard
    2018-02-02 | PDF
    This project developed a low cost building energy management system (EMS) and conducted vehicle-to-grid (V2G) experiments on a commercial office building. The V2G effort included the installation and operation of a Princeton Power System CA-30 bi-directional power system. These experiments targeted the reduction of utility peak electrical demand fo ...
  • Designing Base and Subbase to Resist Environmental Effects on Pavements
    Designing Base and Subbase to Resist Environmental Effects on Pavements
    Oman, Matthew S. ;
    Lund, Neil G.
    2018-02-02 | PDF
    MnDOT’s current pavement thickness design procedures do not characterize the effects of subgrade soil frost susceptibility. Previous research indicates frost action is the most severe environmental factor on pavement performance. The most accepted mitigation practice is to replace the frost-susceptible material with non-frost-susceptible material t ...
  • Safety Effectiveness of StopSign Beacons A CrossSectional Study
    Safety Effectiveness of Stop-Sign Beacons : A Cross-Sectional Study
    Hallmark, Shauna L. ;
    Goswamy, Amrita
    2018-02-02 | PDF
    Rural intersections account for 16% of fatalities in rural areas (IIHS 2016). Rural intersection crashes are frequently a result of drivers’ failing to yield to the right of way. Failure to yield right-of-way (FTYROW) may be due to speeding, which can result in failure to react in time or may be due to failure to recognize the presence of the inter ...
  • Missouri Highway Safety Manual Recalibration 201801
    Missouri Highway Safety Manual Recalibration [2018-01]
    Sun, Carlos ;
    Edara, Praveen
    2018-02-02 | PDF
    The Highway Safety Manual (HSM) is a national manual for analyzing the highway safety of various facilities, including rural roads, urban arterials, freeways, and intersections. The HSM was first published in 2010, and a supplement was published in 2014 that addressed freeway interchanges. The HSM incorporated the safety modeling results from sever ...
  • CENTERLINE RUMBLE STRIPS SAFETY IMPACT EVALUATIONPHASE 2
    CENTERLINE RUMBLE STRIPS SAFETY IMPACT EVALUATION—PHASE 2
    Guin, Angshuman ;
    Rodgers, Michael O.
    2018-02-02 | PDF
    Centerline rumble strips are used by various states as a low-cost countermeasure for mitigating cross-over crashes on two-way highways. This study performs a safety impact evaluation using an empirical Bayesian analysis. The researchers obtained a crash modification factor of 0.58, indicating a 42% reduction in crashes involving centerline crossing ...
  • Financial Achievability of the Florida Department of Transportation Research Projects Putting the Financial Analysis Framework into Action
    Financial Achievability of the Florida Department of Transportation Research Projects : Putting the Financial Analysis Framework into Action
    Born, Patricia H. ;
    Dumm, Randy E.
    2018-02-02 | PDF
    The Florida State University Center for Insurance Research conducted research and developed a financial analysis framework, the Financial Achievability Model (FAM), that will allow the Florida Department of Transportation (FDOT) Research Center to better assess research projects. In this report, the researchers illustrate the use of the FAM to eval ...
    Supporting Files
  • Evaluation of LowCost CentimeterLevel Accuracy OEM GNSS Receivers
    Evaluation of Low-Cost, Centimeter-Level Accuracy OEM GNSS Receivers
    Jackson, John ;
    Saborio, Ricardo
    2018-02-02 | PDF
    This report discusses the results of a study to quantify the performance of low-cost, centimeter-level accurate Global Navigation Satellite Systems (GNSS) receivers that have appeared on the market in the last few years. Centimeter-level accuracy is achieved using a complex algorithm known as real-time kinematic (RTK) processing. It involves proces ...
  • Work Zone Intrusion Report Interface Design
    Work Zone Intrusion Report Interface Design
    Morris, Nichole L. ;
    Craig, Curtis M.
    2018-02-02 | PDF
    While necessary for roadways, work zones present a safety risk to crew. Half of road workers deaths between 2005 and 2010 were due to collisions with motorists intruding on the work zone. Therefore, addressing intrusions is an important step for ensuring a safe work environment for crewmembers. However, a recent research synthesis at the Minnesota ...
  • Understanding the Distributional Impacts of Vehicle Policy Who Buys New and Used Alternative Vehicles
    Understanding the Distributional Impacts of Vehicle Policy : Who Buys New and Used Alternative Vehicles?
    Muehlegger, Erich ;
    Rapson, David
    2018-02-02 | PDF
    This research project explores the plug-in electric vehicle (PEV) market, including both Battery Electric Vehicles (BEVs) and Plug-in Hybrid Electric Vehicles (PHEVs), and the sociodemographic characteristics of purchasing households. We use detailed micro-level data on PEV purchase records to answer two primary research questions. 1) We seek to pr ...
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