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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 6641 - 6660 of 36104 results
  • Determining Optimum Thickness for LongLife Concrete Pavement in Ohio
    Determining Optimum Thickness for Long-Life Concrete Pavement in Ohio
    Sargand, Shad ;
    Al-Jhayyish, Anwer
    2018-08-01 | PDF
    The AASHTO 1993 design equation for rigid pavements implies an increasing thickness of concrete will be needed as traffic increases. However, fatigue testing of concrete beams has shown concrete can endure an unlimited number of loads if the stress ratio (SR) is less than a critical value. Any greater thickness results in an overdesigned slab and i ...
  • Investigating the Development of CMFs from Probability Analyses Final Report
    Investigating the Development of CMFs from Probability Analyses [Final Report]
    Avelar, Raul ;
    Lord, Dominique
    2018-08-01 | PDF
    The Highway Safety Manual (HSM) defines a Crash Modification Factor (CMF) as the ratio of the number of crashes expected after a modification or measure implementation to the number of crashes per unit of time estimated if the change does not take place. The success of applying methods such as the cross-sectional, and before-after analyses to estim ...
  • PerformanceBased Operations Assessment of Adaptive Control Implementation in Des Moines Iowa
    Performance-Based Operations Assessment of Adaptive Control Implementation in Des Moines, Iowa
    Sharma, Anuj ;
    Hawkins, Neal
    2018-08-01 | PDF
    Maintaining optimal mobility on high-volume arterial traffic corridors is important to transportation agencies and the public. Corridor performance often can be enhanced by updating traffic signal timing, but most agencies find it necessary to prioritize their retiming efforts based on resource constraints. To facilitate prioritization, a set of ar ...
    Supporting Files
  • An Assessment of Traffic Safety between Drivers and Bicyclists Based on Roadway CrossSection Designs and Countermeasures Using Simulation
    An Assessment of Traffic Safety between Drivers and Bicyclists Based on Roadway Cross-Section Designs and Countermeasures Using Simulation
    Cai, Qing ;
    Abdel-Aty, Mohamed
    2018-08-01 | PDF
    Cycling is encouraged in countries around the world as an economical, energy-efficient, and sustainable mode of transportation. Simulation is an important approach to analyzing the safety of cycling by identifying the effects of different factors. To ensure the success of a simulation study, it is essential to know the factors that have significant ...
  • Retightening the Large Anchor Bolts of Support Structures for Signs and Luminaires
    Re-tightening the Large Anchor Bolts of Support Structures for Signs and Luminaires
    Chen, An ;
    Schaeffer, Connor
    2018-08-01 | PDF
    Many state Departments of Transportation (DOT) across the US, including MnDOT, are experiencing problems associated with loose anchor bolts used in support structures (e.g., overhead signs, high-mast light tower (HMLT), and tall traffic signals). Specifically, MnDOT inspection crews have found loose nuts at most anchor bolt locations, even at some ...
  • The Impact of Connected Vehicle Market Penetration and Connectivity Levels on Traffic Safety in Connected Vehicles Transition Period
    The Impact of Connected Vehicle Market Penetration and Connectivity Levels on Traffic Safety in Connected Vehicles Transition Period
    Abdel-Aty, Mohamed ;
    Wang, Ling
    2018-08-01 | PDF
    The recent advent of connected vehicles (CV) technologies could bring unprecedented opportunities to improve road safety, especially under reduced-visibility conditions. Reduced-visibility conditions increase the probability of rear-end crash occurrences and their severity. Moreover, slow traffic may be formed due to bottlenecks on freeways. This p ...
  • Program for Vehicle Regulatory Reform Assessing Life CycleBased Greenhouse Gas Standards
    Program for Vehicle Regulatory Reform: Assessing Life Cycle-Based Greenhouse Gas Standards
    Kendall, Alissa ;
    Ambrose, Hanjiro
    2018-08-01 | PDF
    In the United States, the transportation sector is responsible for 36% of greenhouse gas (GHG) emissions, with light-duty vehicles (LDVs) comprising the largest contribution [1]. Globally, transportation is responsible for approximately 24% of energy-related GHG emissions, of which road transport constitutes over 70% [2]. In addition to other measu ...
  • Regional Opportunities and Challenges for TransitOriented Development The Case of the Texas Triangle
    Regional Opportunities and Challenges for Transit-Oriented Development: The Case of the Texas Triangle
    Zhang, Ming ;
    Goodrich, Brendan
    2018-08-01 | PDF
    Transit-oriented development (TOD) has been largely the practice of local communities and transit agencies, but few have explored TOD opportunities and challenges from a regional perspective. This research aims to fill the gap, with a focus on the Texas Triangle. The project contains six tasks. Task 1 summarizes the types and service characteristic ...
  • To Trust or Not to Trust A SimulationBased Experimental Paradigm
    To Trust or Not to Trust? A Simulation-Based Experimental Paradigm
    Knodler Jr., Michael A. ;
    Christofa, Eleni
    2018-08-01 | PDF
    The automated driving system is expected to enhance traffic safety and flow; however, the system will not be as effective if users do not accept it or do not utilize it appropriately [1]. Appropriate acceptance and use of technology depends on attributes such as perceived risk, mental workload, self-confidence, and appropriate level of trust that m ...
  • Lateral Resistance of Piles Within Corrugated Metal Sleeves Final Summary Report 3 for Study TPF5272
    Lateral Resistance of Piles Within Corrugated Metal Sleeves: Final Summary Report #3 for Study TPF-5(272)
    Rollins, Kyle M. ;
    Russell, Dalin N
    2018-08-01 | PDF
    Pile foundations supporting bridge abutments are often driven inside corrugated metal pipe sleeves (CMS) which extend through the approach fill to reduce downdrag or for construction expediency. The annular space between the pile and the sleeve is typically filled with uncompacted pea gravel. Designers often assume that the lateral resistance of th ...
  • Mechanistic Characterization of Asphalt Overlays for Pavement Rehabilitation and Preservation Using Pavement ME Approach Research Project Capsule 192P
    Mechanistic Characterization of Asphalt Overlays for Pavement Rehabilitation and Preservation Using Pavement ME Approach: Research Project Capsule 19-2P
    Wu, Zhong
    2018-08-01 | PDF
    The objectives of this research are to assess/evaluate the performance and condition of existing and prospective structural overlay sections utilizing Louisiana Department of Transportation and Development's (LADOTD's) locally calibrated, AASHTOWare Pavement Mechanistic-Empirical (ME) Design software; to address the existing issues regarding Paveme ...
  • Port Authority of New York and New Jersey Resiliency Initiative
    Port Authority of New York and New Jersey Resiliency Initiative
    Azadegan, Arash
    2018-08-01 | PDF
    Port Authority of New York and New Jersey (PANYNJ) spends almost 39% on contract services, materials, equipment and other which is almost equal to the 41% expenditure on employees. It can, therefore, be inferred that suppliers are equal stakeholders in the operations of the Agency. Given that nearly 85% of these suppliers are located in NY & NJ the ...
  • Development of a Friction Performance Test for Compacted Asphalt Mixtures
    Development of a Friction Performance Test for Compacted Asphalt Mixtures
    McDaniel, Rebecca S. ;
    Shah, Ayesha
    2018-08-01 | PDF
    In a previous JTRP project published in 2010, Identification of Laboratory Techniques to Optimize Superpave HMA Surface Friction Characteristics, a laboratory procedure to polish and test the frictional properties of asphalt mixtures was developed. Subsequently, the procedure has been used in other research efforts to evaluate the frictional proper ...
  • The Influence of Pile Shape on Lateral Load Resistance Final Summary Report 2 for Study TPF5272
    The Influence of Pile Shape on Lateral Load Resistance: Final Summary Report #2 for Study TPF-5(272)
    Rollins, Kyle M. ;
    Russell, Dalin N
    2018-08-01 | PDF
    The lateral resistance of pile foundations is typically based on the performance of circular piles even though other pile types are used. Due to a lack of data, there is a level of uncertainty when designing pile foundations other than circular piles for lateral loading. Theoretical analyses have suggested that square sections will have more latera ...
  • Moisture Susceptibility Testing for Hot Mix Asphalt Pavements in New England
    Moisture Susceptibility Testing for Hot Mix Asphalt Pavements in New England
    Dave, Eshan ;
    Daniel, Jo Sias
    2018-08-01 | PDF
    As Reclaimed Asphalt Pavement (RAP) is added to Hot Mix Asphalt (HMA) in increasing percentages, many HMA producers are exploring the use of warm mix technologies to offset the stiffness of the aged binder included in the RAP and aid in compaction and workability of the RAP mixtures. In addition, the relatively lower mixing temperatures associated ...
  • Installation of Thermocouples and Analysis of Temperature Data from the 21st South Bridge
    Installation of Thermocouples, and Analysis of Temperature Data from the 21st South Bridge
    Nichols, Gilbert A ;
    Halling, Marvin W.
    2018-08-01 | PDF
    Structural Health monitoring is to determine the condition of a bridge based on instrument measurements. The C-846 Bridge in Salt Lake City has such instrumentation. The bridge is located in Salt Lake City at about 2100 South and Interstate 15. This bridge has two kinds of instruments on it: accelerometers and thermocouples. The accelerometers meas ...
  • Implementation of a Precast Inverted TBeam System in Virginia Part II Analytic and Field Investigations
    Implementation of a Precast Inverted T-Beam System in Virginia: Part II: Analytic and Field Investigations
    Menkulasi, Fatmir ;
    Cousins, Thomas E.
    2018-08-01 | PDF
    The inverted T-beam superstructure is a bridge system that provides an accelerated construction alternative for short-to-medium-span bridges. The system consists of adjacent precast inverted T-beams with a cast-in-place concrete topping. This bridge system is expected to not experience the reflective cracking problems manifested in short-to-medium- ...
  • Evaluation of Different Paint Systems for OverCoating Existing Structural Steel Technical Brief
    Evaluation of Different Paint Systems for Over-Coating Existing Structural Steel [Technical Brief]
    Venkiteela, Giri ;
    Balaguru, Perumalsamy
    2018-08-01 | PDF
    This project was undertaken to identify a procedure to accept new coating systems for over-coating of steel surfaces. The practices used by various state transportation agencies, and test methods for accelerated testing of coatings with primary focus on ASTM and FHWA guidelines were reviewed. It was concluded that a new protocol for accepting new s ...
  • Intelligent Highway Management System for the City of Wichita Final Report
    Intelligent Highway Management System for the City of Wichita: Final Report
    Wang, Pingfeng ;
    Krishnan, Krishna
    2018-08-01 | PDF
    The researchers at Wichita State University collaborated with the Kansas Department of Transportation’s Traffic Management Center in Wichita, Kansas, to develop an Intelligent Highway Management System (IHMS). The functions of the IHMS were to conveniently extract specific incident-relevant record data from high-dimensional, high-volume time series ...
  • Comparison of NU IGirders and KGirders for Use in Kansas Pretensioned Concrete Bridges
    Comparison of NU I-Girders and K-Girders for Use in Kansas Pretensioned Concrete Bridges
    Peterman, Robert J. ;
    Chen, Yu-Szu
    2018-08-01 | PDF
    Over the past five decades, prestressed concrete bridge girders have evolved from traditional bulky shapes to efficient girder cross-sections with long spans and wide, thin top and bottom flanges. The objective of this research study is to provide the Kansas Department of Transportation (KDOT) with the information needed to make an informed decisio ...
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