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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 4841 - 4860 of 36908 results
  • Life Cycle Environmental Impact of Houston METRO System Evaluation of Electric Alternatives
    Life Cycle Environmental Impact of Houston METRO System – Evaluation of Electric Alternatives
    Kommalapati, Raghava ;
    Du, Hongbo
    2020-08-01 | PDF
    In the Greater Houston Area, mobile sources (on- and off-road vehicles) contribute the highest share of nitrogen oxide (NOₓ) emissions and second-highest share of volatile organic (VOC) emissions. The Houston METRO system is a key element in Houston's infrastructure that can be expanded to lower emissions of criteria air pollutants (CAPs) and green ...
  • Monitoring and Performance Analysis of the TH 610 IronEnhanced Filtration System
    Monitoring and Performance Analysis of the TH 610 Iron-Enhanced Filtration System
    Mohseni, Omid
    2020-08-01 | PDF
    In 2011, the Minnesota Department of Transportation (MnDOT) installed an iron-enhanced sand filter (IESF) at Trunk Highway (TH) 610 and County Road 81 in Maple Grove, Minnesota. This feature is a two-cell filtration system into which part of Trunk Highway 610 and County Road 81 drain. From 2012 through 2018, MnDOT monitored the influents and efflue ...
  • A Roadway Context Classification Approach for Developing Safety Performance Functions and Determining Traffic Operational Effects for Florida Intersections
    A Roadway Context Classification Approach for Developing Safety Performance Functions and Determining Traffic Operational Effects for Florida Intersections
    Al-Deek, Haitham ;
    Sandt, Adrian
    2020-08-01 | PDF
    This research developed safety performance functions (SPFs) based on a new Florida Department of Transportation (FDOT) context classification system which contains eight context categories as opposed to the three classifications used in the Highway Safety Manual (HSM). To develop these context-specific SPFs, data were collected for several potentia ...
  • Comparison of SHRP 2 Naturalistic Driving Data to Geometric Design Speed Characteristics on Freeway Ramps [supporting datasets]
    Brewer, Marcus A. ;
    Stibbe, Jayson
    2020-08-01 | PDF
    Project Description: Comparison of SHRP2 Naturalistic Driving Data to Geometric Design Speed Characteristics on Freeway Ramps” was a study sponsored by SAFE-D that examined data on freeway ramps from the SHRP2 NDS – speed profiles along with selected driver and vehicle variables – and compared that data to the design characteristics of the ramps tr ...
    Dataset Supporting Files
  • Extraction of Vehicle CAN Bus Data for Roadway Condition Monitoring
    Extraction of Vehicle CAN Bus Data for Roadway Condition Monitoring
    Li, Howell ;
    Saldivar-Carranza, Enrique
    2020-08-01 | PDF
    Obtaining timely information across the state roadway network is important for monitoring the condition of the roads and operating characteristics of traffic. One of the most significant challenges in winter roadway maintenance is identifying emerging or deteriorating conditions before significant crashes occur. For instance, almost all modern vehi ...
  • Exploring the Role of Transportation on Cancer Patient DecisionMaking Through Machine Learning Techniques
    Exploring the Role of Transportation on Cancer Patient Decision-Making Through Machine Learning Techniques
    Etminanighasrodashti, Roya ;
    Kan, Chen
    2020-08-01 | PDF
    Transportation barriers are often considered as critical factors that influence healthcare accessibility and cancer patients' decision-making regarding treatments or post-treatment process. Moreover, the built environment and lack of access to affordable and efficient transportation would significantly affect the quality of life of patients with ch ...
  • Durability Evaluation of Ternary Mix Designs for Extremely Aggressive Exposures Phase II
    Durability Evaluation of Ternary Mix Designs for Extremely Aggressive Exposures Phase II
    Riding, Kyle A ;
    Ferraro, Christopher C.
    2020-08-01 | PDF
    Concrete made with low transport properties can be very durable even in extremely aggressive environments. This study examined the ability of resistivity testing to determine transport properties for concrete containing ternary blends of portland cement with supplemental cementitious materials. The penetrability of the concrete was tested using rap ...
  • Develop New Methods to Use ODOT WeighinMotion Data for Predicting Freight Flow andor Commodity Patterns
    Develop New Methods to Use ODOT Weigh-in-Motion Data for Predicting Freight Flow and/or Commodity Patterns
    Anderson, Jason C. ;
    Unnikrishnan, Avinash
    2020-08-01 | PDF
    This study presents the results of a detailed analysis of Oregon weigh-in-motion (WIM) data. First, a quality control analysis was conducted considering Oregon Department of Transportation (ODOT) Class 11 (FHWA Class 09 trucks). Next, a set of descriptive analyses were conducted, one focusing on all WIM stations and one focusing on select WIM stati ...
  • Impact of Access Spacing Standards on Crash Risk After Controlling for Access Volumes
    Impact of Access Spacing Standards on Crash Risk After Controlling for Access Volumes
    Flintsch, Alejandra Medina ;
    Guo, Feng
    2020-08-01 | PDF
    Engineers and planners are typically tasked with approving new entrance permits, evaluating permitting exceptions, and generating safety countermeasures for specific corridors. Although several studies show that a smaller space between two access points is associated with an increased crash risk, the relationship between these two factors is not fu ...
  • Evaluation of LongTerm Performance of Stabilized Sediment for Beneficial Use
    Evaluation of Long-Term Performance of Stabilized Sediment for Beneficial Use
    Maher, Ali ;
    Miskewitz, Robert
    2020-08-01 | PDF
    Over the past twenty years, the state of New Jersey has accepted over 30 million cubic yards of material that have many practical uses. This study was conducted to develop a methodology based on existing studies, reviewing records, and visiting field sites. A total of 6 sites in NJ where stabilized dredged materials (SDM) had been used to augment a ...
  • Statistical Inference Without Excess Data Using Only Stochastic Gradients Volume 1
    Statistical Inference Without Excess Data Using Only Stochastic Gradients: Volume 1
    Li, Tianyang ;
    Liu, Liu
    2020-08-01 | PDF
    We present a novel statistical inference framework for convex empirical risk minimization, using approximate stochastic Newton steps. The proposed algorithm is based on the notion of finite differences and allows the approximation of a Hessian-vector product from first-order information. In theory, our method efficiently computes the statistical er ...
  • Measuring Transportation Accessibility for MPOs and for the State of ND
    Measuring Transportation Accessibility for MPOs and for the State of ND
    Advance Traffic Analysis Center (ATAC)  ...
    2020-08-01 | PDF
    This project covers the development of Accessibility measures for the State of North Dakota at the county level and for the three North Dakota MPOs. It explains the procedures, constraints and considerations for the use of the model as an evaluation tool to measure the effectiveness off the transportation system to meet the needs of residents.
  • Buffalo Main Street Smart Corridor Plan
    Buffalo Main Street: Smart Corridor Plan
    Hamann-Burney, Jamie ;
    Frank, Frederick A.
    2020-08-01 | PDF
    Smart City technological applications have been employed in several cities worldwide to help improve functionality of transportation infrastructure. The information collected through the distribution of sensors inform applications that optimize city life. The Steering Committee for this project, led by the Buffalo Niagara Medical Campus (BNMC), env ...
  • Using Microtransit Electric Low Speed Vehicles as a Means for Improving Quality of Life in MiamiDade County
    Using Microtransit Electric Low Speed Vehicles as a Means for Improving Quality of Life in Miami-Dade County
    Cevallos, Fabian
    2020-08-01 | PDF
    The services provided by public transportation systems increase the mobility and accessibility options of a community. In addition, transit improvements are one of the transportation demand strategies for enhancing community livability, as they offer affordable transportation alternatives and help reduce traffic congestion. They can provide access ...
  • Investigating Autonomous Vehicle Impacts on Individual ActivityTravel Behavior
    Investigating Autonomous Vehicle Impacts on Individual Activity-Travel Behavior
    Dannemiller, Katherine A. ;
    Mondal, Aupal
    2020-08-01 | PDF
    This paper develops an analytic system to investigate the effects of AV availability on multiple dimensions of activity-travel behavior at once, based on a direct survey-based modeling approach. The model uses individual socio-demographics, built environment variables, as well as psycho-social variables (in the form of latent psychological construc ...
  • Optimal Placement of ReservationBased Intersections in Urban Networks
    Optimal Placement of Reservation-Based Intersections in Urban Networks
    Patel, Rahul ;
    Venkatraman, Prashanth
    2020-08-01 | PDF
    Reservation-based traffic control is a revolutionary intersection management system which involves the communication of autonomous vehicles and an intersection to request space-time trajectories through the intersection. Although previous studies have found congestion and throughput benefits of reservation-based control that surpass signalized cont ...
  • Detection and Estimation of Inundation and Associated Risks Using Traffic Monitoring Cameras and Image Processing Under Extreme Flooding Conditions
    Detection and Estimation of Inundation and Associated Risks Using Traffic Monitoring Cameras and Image Processing Under Extreme Flooding Conditions
    Ham, Suyun ;
    Noh, Seongjin
    2020-08-01 | PDF
    The main objective of this project is to develop an inundation detection and evaluation framework using images from traffic monitoring cameras and reliable flood monitoring under extreme precipitation conditions. This study presents a comparative assessment of image enhancement and segmentation techniques to automatically identify the flash floodin ...
  • Severe Weather Index
    Severe Weather Index
    Fay, Laura ;
    Villwock-Witte, Natalie
    2020-08-01 | PDF
    A severe weather index (SWI) was developed and tested using RWIS data from 2012 to 2020. The developed SWI model has an overall adjusted R2 = 0.67. The severity bounds are defined as low (0 to 1.2), moderate (1.2 to 8), and severe (greater than 8). The SWI model was tested quantitively and qualitatively using 2019-2020 winter weather data and input ...
  • Evaluation Comparison and Correlation Between the Idaho IT144 and AASHTO T84 Methods for Determining the Specific Gravity and Absorption Properties of Fine Aggregate
    Evaluation, Comparison, and Correlation Between the Idaho IT-144 and AASHTO T-84 Methods for Determining the Specific Gravity and Absorption Properties of Fine Aggregate
    Sharma, Sunil ;
    Kassem, Emad
    2020-08-01 | PDF
    The objective of this study was to develop a correlation between lab tests performed using the CoreLok (Idaho -IT-144) method and results from the AASHTO T-84 procedure for fine aggregates in Idaho. These tests are used to determine critical aggregate parameters such as (a) absorption, (b) Gsa, (c) Gsb, and (d) GsbSSD. The AASHTO T-84 procedure tak ...
  • Effects of Incorporating Connected Vehicle Technologies Into NoNotice Emergency Evacuation During Winter Weather Phase I
    Effects of Incorporating Connected Vehicle Technologies Into No-Notice Emergency Evacuation During Winter Weather (Phase I)
    Chen, Chuang ;
    Shi, Xianming
    2020-08-01 | PDF
    The goal of this Center for Advanced Multimodal Mobility Solutions and Education (CAMMSE) project was to preliminarily model the microscopic and macroscopic effects of incorporating connected vehicle (CV) technologies into emergency evacuation during typical winter weather in the Pacific Northwest. To meet this goal, the following objectives will b ...
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