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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 4761 - 4780 of 36908 results
  • Supporting Bridge Management With Advanced Analysis and Machine Learning
    Supporting Bridge Management With Advanced Analysis and Machine Learning
    Steelman, Joshua ;
    Garcia, Francisco
    2020-09-01 | PDF
    A supplemental Artificial Neural Network (ANN)-based tool was developed to support the Nebraska Department of Transportation (NDOT) in optimizing bridge management investments when choosing between refined modeling, field testing, retrofitting, or bridge replacement. Load ratings typically increase by approximately 15% to 20% when using detailed fi ...
  • Utilizing School Bus Routes to Deliver Meals to Families in Need
    Utilizing School Bus Routes to Deliver Meals to Families in Need
    Smith, Stephen F. ;
    Lightman, Karen
    2020-09-01 | PDF
    This report summarizes the results of a 3-month project aimed at coupling artificial intelligence (AI)-based routing and scheduling technology with machine learning to demonstrate an initial solution to the problem of remote delivery of school meals to students in need, and jumpstarting research in this area. With the onset of the COVID-19 pandemic ...
  • Development and Calibration of a LaserBased Highway Deflection Measuring System
    Development and Calibration of a Laser-Based Highway Deflection Measuring System
    Hernandez, Joaquin B. ;
    Vishnoi, Suyash
    2020-09-01 | PDF
    Despite recent developments, the measurement of actual pavement surface deflections under the axles of a moving truck at a network level remains a challenge in pavement engineering. Several pieces of equipment have been developed in the past decade but they fail to accurately measure actual deflection. Most of them measure indicators of deflection ...
  • Trajectory Optimization of Connected and Autonomous Vehicles CAVs at Signalized Intersections
    Trajectory Optimization of Connected and Autonomous Vehicles (CAVs) at Signalized Intersections
    Fan, Wei (David) ;
    Liu, Pengfei
    2020-09-01 | PDF
    This research will develop guidelines and recommendations for estimating and predicting intersection efficiency in the presence of connected and autonomous vehicles (CAVs) and therefore will lead to a better understanding of how CAVs will improve mobility at signalized intersections. To better understand the impact of CAVs on the operation of signa ...
  • Characteristics of Effective Metropolitan Areawide Public Transit A Comparison of European Canadian and Australian Case Studies
    Characteristics of Effective Metropolitan Areawide Public Transit: A Comparison of European, Canadian, and Australian Case Studies
    DeRobertis, Michelle ;
    Ferrell, Christopher E.
    2020-09-01 | PDF
    This research project investigates the replicable characteristics, policies, and practices of successful metropolitan areawide public transportation networks that contribute to high usage and make transit an effective competitor to the private motor vehicle. The research method involves the qualitative and quantitative analysis of ten international ...
  • Impacts of Bicycling Corridor Improvements on Users Behaviors in Large Cities
    Impacts of Bicycling Corridor Improvements on Users’ Behaviors in Large Cities
    Azimi, Mehdi ;
    Rahman, Mohammed Suyedur Luqman
    2020-09-01 | PDF
    Research has shown that increasing opportunities for bicycle transportation can reduce overall Vehicle Miles Traveled (VMT) and auto trips, promote economic development, and improve environmental quality and public health and physical activity. Furthermore, bike lanes and corridors improve the transportation mobility by reducing interaction between ...
  • Evaluation of LongTerm Strength and Durability Properties of PreStressed Concrete Girders With Microcracking
    Evaluation of Long-Term Strength and Durability Properties of Pre-Stressed Concrete Girders With Microcracking
    Ferron, Raissa ;
    Salvatore, S
    2020-09-01 | PDF
    The presence of unexplained surface microcracks in several in-service prestressed girders across Texas led to concerns of reduced service life due to loss in long-term strength and durability. This project was designed to estimate both this potential loss in service life and the likelihood of long-term strength and durability issues that might aris ...
  • Rural Transit Fact Book 2020
    Rural Transit Fact Book 2020
    Mattson, Jeremy ;
    Mistry, Dilip
    2020-09-01 | PDF
    Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c ...
  • Measuring Success for Safe Routes to School Programs Research Brief
    Measuring Success for Safe Routes to School Programs [Research Brief]
    Pande, Anurag ;
    Voulgaris, Carole Turley
    2020-09-01 | PDF
    Safe Routes to School (SRTS) programs aim to increase the share of students who commute to school by active modes (e.g., walking and cycling). The goal of this work was to assess the effectiveness of SRTS programs. Towards that end, we analyzed the California Household Travel Survey (CHTS) data from the four counties in the San Francisco Bay area. ...
  • Automatic Traffic Monitoring and Management for Pedestrian and Cyclist Safety Using Deep Learning and Artificial Intelligence
    Automatic Traffic Monitoring and Management for Pedestrian and Cyclist Safety Using Deep Learning and Artificial Intelligence
    Pourhomayoun, Mohammad
    ORCID ICON IMG
    2020-09-01 | PDF
    In this project, we have designed and developed an effective end-to-end system based on advanced Artificial Intelligence (AI), machine learning, and computer vision to automatically monitor, detect, track, and count pedestrians and bicyclists. The main objective of this project is to improve the safety of pedestrians and bicyclists, by applying sel ...
  • Development and Validation of Methodologies for Rapid Inspection and Assessment of Fatigue Damage
    Development and Validation of Methodologies for Rapid Inspection and Assessment of Fatigue Damage
    Roy, Sougata
    2020-09-01 | PDF
    Causes of unusual fatigue cracking of a steel bridge owned by the New Jersey Turnpike Authority (NJTA) was investigated by Finite Element Analysis (FEA). The bridge is located on a strategic commerce route and is subjected to high Average Daily Truck Traffic (ADTT) consisting of significant fraction of overloaded trucks having Gross Vehicle Weight ...
  • Longer Service Life Bridge Coatings
    Longer Service Life Bridge Coatings
    Wells, Danny ;
    Hopwood, Theodore
    2020-09-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has maintenance oversight responsibilities for approximately 1,100 steel bridges; it also helps local governments and other entities with maintenance painting on other steel bridges. Because maintaining steel bridges is costly, Cabinet officials asked Kentucky Transportation Center (KTC) researchers to ide ...
  • DSRBased Test Procedures and Specification Guidelines for Grading PG 58XX and PG 64SXX Asphalt Binders in Kansas
    DSR-Based Test Procedures and Specification Guidelines for Grading PG 58-XX and PG 64S-XX Asphalt Binders in Kansas
    Darabi, Masoud K
    2020-09-01 | PDF
    This report addresses a shortcoming of the Multiple Stress Creep Recovery (MSCR) test method and specification system for virgin PG 58-XX and blends of PG 58-XX with reclaimed asphalt pavement (RAP) binders. The MSCR specification system limits the non-recoverable compliance, Jnr, to less than 4.5 kPa-1 for standard S-graded binders and disregards ...
  • Structural Assessment for MD Sign Structures Project based on AASHTO LTS6 Strength and Fatigue Criteria
    Structural Assessment for MD Sign Structures Project based on AASHTO LTS-6 Strength and Fatigue Criteria
    Fu, Chung C. ;
    Ye, Yunchao
    2020-09-01 | PDF
    The purpose of this project is to conduct a structural assessment of Maryland sign structures based on the American Association of State Highway and Transportation Officials (AASHTO) Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th edition (AASHTO LTS-6) strength and fatigue criteria, using these criter ...
  • Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks Research Project Capsule 211P
    Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks: Research Project Capsule [21–1P]
    Wu, Zhong
    2020-09-01 | PDF
    To achieve the objectives of this study, a neural network based system will be developed, using the data collected by DOTD on regular basis and local weather information. The proposed methodology can be summarized as follows. A review and documentation of the current state of practice by DOTD will evaluate short-term and long-term road condition an ...
  • Truck Traffic and Load Spectra of Indiana Roadways for the MechanisticEmpirical Pavement Design Guide
    Truck Traffic and Load Spectra of Indiana Roadways for the Mechanistic-Empirical Pavement Design Guide
    Bao, Jieyi ;
    Hu, Xiaoqiang
    2020-09-01 | PDF
    The Mechanistic-Empirical Pavement Design Guide (MEPDG) has been employed for pavement design by the Indiana Department of Transportation (INDOT) since 2009 and has generated efficient pavement designs with a lower cost. It has been demonstrated that the success of MEPDG implementation depends largely on a high level of accuracy associated with the ...
  • Traffic Noise Barrier Analysis for SH 190 in Rowlett Texas
    Traffic Noise Barrier Analysis for SH 190 in Rowlett, Texas
    Trevino, Manuel
    2020-09-01 | PDF
    The Texas Department of Transportation commissioned a study to analyze the feasibility and effectiveness of lightweight noise barriers on Interstate Highway (IH) 30, near downtown Dallas in 2013. The study led to the installation of two adjacent transparent highway noise barriers in 2013 and 2018, respectively. The success of that project led to th ...
  • Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons Utah Phase II Study
    Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons, Utah Phase II Study
    Fonseca, Fernando S. ;
    Thompson, Robert A
    2020-09-01 | PDF
    The purpose of this study was to extract galvanized steel wire reinforcement coupons from mechanically stabilized earth (MSE) walls along I-15 in Salt Lake Valley and determine the rate of corrosion that has taken place since Phase I, which was conducted by Gerber and Billings (2010). The galvanized steel reinforcement analyzed in this study has be ...
  • Model Development Standards in the Construction Industry and Beyond
    Model Development Standards in the Construction Industry and Beyond
    Maier, Francesca
    2020-09-01 | PDF
    UDOT has made investments in formalizing its approach to digital delivery during the design phase. UDOT has published and updated a guideline for model development and defined standards for model development. The guidelines and standard apply to the design phase and prepare digital data for use in construction and handing over asset information pos ...
  • Quantifying Mountain Basin Runoff Mechanisms for Better Hydrologic Design
    Quantifying Mountain Basin Runoff Mechanisms for Better Hydrologic Design
    Woolridge, D. D ;
    Niemann, J. D
    2020-09-01 | PDF
    Hydrologic analyses are used for dam safety evaluations to determine the flow a dam must pass without failing. They are also used to evaluate bridge and culvert designs from a hydrologic perspective. Many current guidelines model flood runoff solely by an infiltration-excess mechanism. Saturation-excess runoff and subsurface stormflow mechanisms ar ...
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