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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 5341 - 5360 of 36958 results
  • Industry Capacity and Cost Escalation Study
    Industry Capacity and Cost Escalation Study
    Ali, Akber
    2020-02-17 | PDF
    In 2017, the California Legislature passed Senate Bill 1 (SB 1), which raises additional transportation funding through increases in the state gas excise tax, diesel excise tax, and license and registration fees. With the passage of SB 1, the California Department of Transportation (the Department) expects its program to grow significantly with sim ...
  • Active Transportation Environment and Health
    Active Transportation, Environment, and Health
    Daziano, Ricardo ;
    Yoon, So-Yeon
    2020-02-16 | PDF
    Active transportation –cycling and biking– not only are sustainable travel modes with zero environmental impact, but also have associated health benefits. However, in comparison with motorized transportation, the motives underlying demand for active transportation –especially beyond recreational purposes– is poorly understood, especially because th ...
  • Developing Design Guidelines for Commercial Vehicle Envelopes on Urban Streets
    Developing Design Guidelines for Commercial Vehicle Envelopes on Urban Streets
    McCormack, Edward ;
    Goodchild, Anne
    2020-02-15 | PDF
    This report presents research to improve the understanding of curb space and delivery needs in urban areas. Observations of delivery operations to determine vehicle type, loading actions, door locations, and accessories used were conducted. Once common practices had been identified, then simulated loading activities were measured to quantify differ ...
  • Safety Effects of Transit Signal Priority Magnitude and Mechanism
    Safety Effects of Transit Signal Priority: Magnitude and Mechanism
    Noyce, David A. ;
    Song, Yu
    2020-02-14 | PDF
    AbstractPrevious studies have found a correlation between the implementation of transit signal priority (TSP) and a reduction in vehicle crash rates through aggregated analysis. To understand how TSP affects safety, this study engages a more in-depth evaluation. In this study, the effects of TSP are evaluated on a surrogate safety measure - bus mov ...
  • Emerging data for pedestrian and bicycle monitoring Sources and applications
    Emerging data for pedestrian and bicycle monitoring: Sources and applications
    Lee, Kyuhyun ;
    Sener, Ipek N.
    2020-02-14 | PDF
    Growing attention on the benefits of non-motorized travel has increased the demand for accurate and timely pedestrian and bicycle travel data. Advancements in technologies and the proliferation of smartphones have created new data sources that can help eliminate limitations related to small sample size and infrequent updates due to limited resource ...
  • Connected Emission Control Technologies for Freight Vehicles [supporting datasets]
    Boriboonsomsin, Kanok ;
    Luo, Ji
    2020-02-11 | PDF
    This project explores how connected vehicle technology can be used to reduce the impacts of air pollutant emissions from freight vehicles. Specifically, the objective of this project is to develop new vehicle routing algorithms for determining travel routes for heavy-duty diesel trucks that would reduce the exposure of local residents to air pollut ...
    Dataset Supporting Files
  • Development of SelfCleaning Box Culverts Phase III
    Development of Self-Cleaning Box Culverts – Phase III
    Muste, Marian ;
    Xu, Haowen
    2020-02-10 | PDF
    The overall goal of this research is to find solutions that permanently solve the sedimentation at culvert problem by using the self-cleaning concept. This concept relies entirely on the use of the stream’s hydraulic power for passing downstream the culvert the suspended and bed loads carried by the stream. During more than 10 years of research in ...
  • Understanding Behavioral Responses of Wildlife to Traffic to Improve Mitigation Planning [supporting datasets]
    Shilling, Fraser M ;
    Collins, Amy
    2020-02-10 | PDF
    Creating and maintaining sustainable transportation systems depends in part on understanding and mitigating ecological impacts. Wildlife crossing structures (WCS) are often used to mitigate impacts on wildlife populations. WCS and existing structures may provide passage for multiple species, depending on their sensitivity to traffic disturbance and ...
    Dataset Supporting Files
  • Learning To Drive Autonomously
    Learning To Drive Autonomously
    Jiang, Zhong-Ping ;
    Ozbay, Kaan
    2020-02-01 | PDF
    In this report, the authors model the system of a platoon mixed with multiple connected human-driven vehicles (HDVs) and a connected and autonomous vehicle (CAV) as a set of differential difference equations (DDEs), by taking into account drivers’ heterogeneous feedback gains and reaction delays as well as the actuator (engine) delay. Then, the aut ...
  • SPARKMAN A Smart Parking Management Tool for University Campuses
    SPARKMAN: A Smart Parking Management Tool for University Campuses
    Cheu, Ruey Long ;
    Gurbuz, Okan
    2020-02-01 | PDF
    A common transportation problem faced by most universities is inadequate parking supply (capacity) to meet demand. To manage parking, Campus Parking Offices or CPOs usually group parking lots into zones and restrict the use of zones by the type of permit and permit price. Commuter students is the largest group of parking facility users on campus. T ...
  • Using Smartphone as Onboard unit OBU Emulator Implementation Study
    Using Smartphone as On-board unit (OBU) Emulator Implementation Study
    Abdel-Aty, Mohamed A ;
    Cai, Qing
    2020-02-01 | PDF
    This project aimed at using smartphones to emulate the On-Board Unit (OBU) for Infrastructure-to-Vehicle (I2V) and Pedestrian-to-Vehicle (P2V) applications. In order to achieve the objectives, the following tasks were performed. The research team first reviewed existing studies and practices to fully understand smartphone sensors, roadside sensors, ...
  • Calibrating Crash Modification Factors for WyomingSpecific Conditions Application of the Highway Safety Manual Part D Phase 2
    Calibrating Crash Modification Factors for Wyoming-Specific Conditions: Application of the Highway Safety Manual, Part D – Phase 2
    Ahmed, Mohamed M. ;
    Gaweesh, Sherif
    2020-02-01 | PDF
    The Highway Safety Manual (HSM) provides a quantitative measure of safety of various countermeasures known as Crash Modification Factors (CMF). CMFs provided in the HSM are calibrated based on data collected from a few states with specific roadway and climate characteristics in the US, which may not represent the same safety efficacy of countermeas ...
    Supporting Files
  • A Guide To Successfully Convert Severely Distressed Paved Roads to Engineered Unpaved Roads
    A Guide To Successfully Convert Severely Distressed Paved Roads to Engineered Unpaved Roads
    Jones, David ;
    Fay, Laura
    2020-02-01 | PDF
    This document provides guidance on converting severely distressed paved roads to engineered unpaved roads. Chapter 1 provides background on unpaving and an introduction to the guide. Chapter 2 guides the practitioner through a process of deciding whether a road is a candidate for unpaving and introduces the importance of involving the public in the ...
  • Implementation of ODOT Tack Coat Technologies and Procedures to Improve LongTerm Pavement Performance
    Implementation of ODOT Tack Coat Technologies and Procedures to Improve Long-Term Pavement Performance
    Coleri, Erdem ;
    Villarreal, Richard
    2020-02-01 | PDF
    Using direct shear testing, this study quantified the impact of new emulsions from three companies on bond strength as compared to emulsions traditionally used in Oregon. Additionally, this study focuses on developing and implementing a more robust set of specifications and quality control (QC) provisions for tack coats. By improving upon and imple ...
  • Evaluation of CX1 Structural Dynamics Monitor
    Evaluation of CX1 Structural Dynamics Monitor
    Phares, Brent M. ;
    Todsen, Michael
    2020-02-01 | PDF
    Monitoring of the in-field performance of bridges and other structures has become a very valuable tool to the Iowa DOT Office of Bridges and Structures. There simply is no better way to understand how structures react to loadings than by physical monitoring and testing. There are a large number of monitoring tools that are commercially available. O ...
  • Enhanced Characterization of RAP for Cracking Performance
    Enhanced Characterization of RAP for Cracking Performance
    Roque, Reynaldo ;
    Park, Bongsuk
    2020-02-01 | PDF
    Even though reclaimed asphalt pavement (RAP) has economic and environmental benefits, the average percent usage of RAP in asphalt mixture in the United States is only 20.4%. Current Florida Department of Transportation (FDOT) specifications limit RAP usage to 20% in polymer-modified asphalt (PMA) mixtures and do not allow RAP in high-polymer (HP) m ...
  • A SelfSensing Adaptive Material for a New Generation of Multifunctional Highway Bridge Bearing Systems
    A Self-Sensing Adaptive Material for a New Generation of Multifunctional Highway Bridge Bearing Systems
    Gordaninejad, Faramarz ;
    Itani, Ahmad M.
    2020-02-01 | PDF
    Researchers at the University of Nevada, Reno explored the feasibility of a self-sensing adaptive bridge bearing system. In this system, rubber bearings and sensors made of a magnetorheological elastomer (MRE) (or controllable rubber) respond to loads and vibrations through automated changes in stiffness. The system has a wireless, self-sensing cap ...
  • A Guide To Successfully Convert Severely Distressed Paved Roads to Engineered Unpaved Roads Final Report
    A Guide To Successfully Convert Severely Distressed Paved Roads to Engineered Unpaved Roads – Final Report
    Fay, Laura ;
    Jones, David
    2020-02-01 | PDF
    On behalf of the Minnesota Local Road Research Board (LRRB), the Western Transportation Institute (WTI) at Montana State University (MSU) and the University of California Davis (UCD) developed A Guide to Successfully Convert Severely Distressed Paved Roads to Engineered Unpaved Roads. The guide serves as a comprehensive information source on effect ...
  • Mitigation of Cracking in Florida Structural Concrete
    Mitigation of Cracking in Florida Structural Concrete
    Tia, Mang ;
    Subgranon, Thanachart
    2020-02-01 | PDF
    A laboratory study was conducted to evaluate the possible beneficial effects of incorporating shrinkage-reducing admixture (SRA), polymeric microfibers (PMF), and optimized aggregate gradation (OAG) in internally cured concrete (ICC) mixes. Two sets of test slabs using ICC mixes in concrete pavement slab application were also conducted. All the ICC ...
  • Immersive Work Zone Inspection Training Using Virtual Reality
    Immersive Work Zone Inspection Training Using Virtual Reality
    Edara, Praveen ;
    Sun, Carlos
    2020-02-01 | PDF
    Can virtual reality tools be used to train engineers that inspect work zones? In this report, we share the findings of a research project that developed an interactive and immersive training platform using virtual reality to train state department of transportation (DOT) staff that inspect work zones for compliance. Virtual reality offers an immers ...
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