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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 5781 - 5800 of 36053 results
  • Structures Research Services 20182021 Task 1 Final Report Overhead Sign Failure Investigation
    Structures Research Services 2018-2021: Task 1 Final Report - Overhead Sign Failure Investigation
    Nims, Douglas K. ;
    Guner, Serhan
    2019-05-01 | PDF
    A variety of structural supports exist to mount signs along highways. One type of support is a truss that spans the width of the highway that allows for the placement of overhead signs. These trusses are subject primarily to wind and gravity loads. The connections between the chords and the diagonals are typical fillet welded. Fillet welds are a fa ...
  • Strength and Serviceability of Damaged Prestressed Girders
    Strength and Serviceability of Damaged Prestressed Girders
    Tabatabai, Habib ;
    Nabizadeh, Azam
    2019-05-01 | PDF
    This study addresses the assessment and repair of damaged prestressed bridge girders due to either accidental impact by over-height vehicles on the bottom of the girder, or damage to the top flange of the girder during deck removal operations. Both strength and serviceability limit states are considered. Procedures are developed to calculate change ...
  • Effect of Proximity of Sheet Pile Walls on the Apparent Capacity of Driven Displacement Piles Phase 2
    Effect of Proximity of Sheet Pile Walls on the Apparent Capacity of Driven Displacement Piles, Phase 2
    Chung, Jae H ;
    Krauthammer, Ted
    2019-05-01 | PDF
    This Phase 2 report continues research investigating the effects that installation and removal of sheet pile walls (SPWs) have on driven piles founded in granular soils. The method of analysis employed in Task 5 of Phase 1 of this project is extended to model systems involving a driven pile in proximity to two SPWs forming the corner of a closed re ...
  • Interstate 10 Western Connected Freight Corridor Volume 2 Planning Framework
    Interstate 10 Western Connected Freight Corridor, Volume 2: Planning Framework
    Rutter, Allan ;
    Seymour, Ed
    2019-05-01 | PDF
    The Interstate 10 (I-10) western connected freight corridor extends from the Ports of Long Beach and Los Angeles in California to the Port of Beaumont in Texas. Collaborating through a Federal Highway Administration (FHWA) pooled fund study, the state departments of transportation in California, Arizona, New Mexico, and Texas (the I-10 Corridor Coa ...
  • Initial Analytical Investigation of Overhead Sign Trusses with Respect to Remaining Fatigue Life and Predictive Methods for Inspection
    Initial Analytical Investigation of Overhead Sign Trusses with Respect to Remaining Fatigue Life and Predictive Methods for Inspection
    Rasheed, Hayder A. ;
    Abouelleil, AlaaEldin
    2019-05-01 | PDF
    Most state highway agencies do not perform routine fatigue inspections on highway signs, luminaires, and traffic signals, thereby increasing the potential for unnoticed fatigue cracking. The Kansas Highway System utilizes over 450 sign trusses, most of which have been in service for 30–45 years. In addition to aging support structures, the structur ...
  • Structural Study of Cold Central Plant Recycling Sections at the National Center for Asphalt Technology NCAT Test Track Phase II
    Structural Study of Cold Central Plant Recycling Sections at the National Center for Asphalt Technology (NCAT) Test Track: Phase II
    Diefenderfer, Brian K ;
    Timm, David H.
    2019-05-01 | PDF
    The Virginia Department of Transportation (VDOT) contracted with the National Center for Asphalt Technology (NCAT) in 2012 to install, instrument, and monitor three pavement test sections at the NCAT Test Track. These sections were subjected to approximately 20 million 18-kip equivalent single axle loads between 2012 and 2017. Pavement instrumentat ...
  • Balanced Asphalt Concrete Mix Performance in Utah Phase III Evaluation of Field Materials Using BBR and SCBIFIT Tests
    Balanced Asphalt Concrete Mix Performance in Utah, Phase III: Evaluation of Field Materials Using BBR and SCB-IFIT Tests
    Romero, Pedro ;
    VanFrank, Kevin
    2019-05-01 | PDF
    A study was conducted to evaluate the applicability of two cracking tests for low- and intermediate temperature performance for the purpose of creating a balanced hot-mix asphalt mix. For the low-temperature performance, the Bending Beam Rheometer (BBR) test on mixtures based on AASHTO TP-125-16 protocols was studied. For intermediate-temperature p ...
  • Investigation of Concrete Electrical Resistivity as a PerformanceBased Test
    Investigation of Concrete Electrical Resistivity as a Performance-Based Test
    Malakooti, Amir ;
    Thomas, Robert J.
    2019-05-01 | PDF
    The purpose of this research project was to identify the extent that concrete resistivity measurements (bulk and/or surface) can be used as a performance based lab test to improve the quality of concrete in Utah bridge decks. By allowing UDOT to specify a required resistivity, concrete bridge deck quality will increase and future maintenance costs ...
  • Safely and Effectively Communicating NonConnected Vehicle Information to Connected Vehicles through Field and DrivingSimulatorBased Research
    Safely and Effectively Communicating Non-Connected Vehicle Information to Connected Vehicles through Field- and Driving-Simulator-Based Research
    Noyce, David A. ;
    Nassereddine, Hiba
    2019-05-01 | PDF
    The largest safety impact of connected vehicle (CV) technology will occur only when a critical mass of vehicles and infrastructure is connected. This will require significant market penetration and improvements to our infrastructure, and it is occurring at a relatively slow pace compared to autonomous vehicle technology. Until CVs are ubiquitous, s ...
  • Value Capture to Fund Public Transportation: The Impact of Warm Springs BART Station on the Value of Neighboring Residential Properties in Fremont, CA [supporting datasets]
    Mathur, Shishir
    ORCID ICON IMG
    2019-05-01 | ZIP
    This study estimates households’ willingness to pay for single-family houses and condominiums/townhouses located within 2 miles of Warm Springs (WS) BART Station in Fremont, CA. The study finds that, compared to the houses sold in the referent category (2 to 5 miles away and sold during the pre-project-announcement period of 2000-2001), an average- ...
    Dataset Supporting Files
  • Enhancing School Zone Safety Case Studies in Puerto Rico Using Driving Simulation
    Enhancing School Zone Safety: Case Studies in Puerto Rico Using Driving Simulation
    Valdes Diaz, Didier M. ;
    Colucci Rios, Benjamin
    2019-05-01 | PDF
    The objective of this research was to evaluate driver behavior when approaching a school zone and the effectiveness of a new combination of road signage and pavement markings. The strategy behind the use of new traffic control devices (TCDs) in the driving simulator was to evaluate their effectiveness in controlling drivers’ speeds. Two school zone ...
  • Lower Leg Biofidelity Corridors for Heel Impact
    Lower Leg Biofidelity Corridors for Heel Impact
    Forman, Jason L. ;
    Crandall, Jeff R.
    2019-05-01 | PDF
    This report describes the methodology and results of development of biofidelity response corridors based on data for axial loading through the heel of 12 small female post mortem human surrogates (PMHS) lower extremities, and 2 additional small female PMHS. These biofidelity response corridors were based on anticipated measurement capabilities of t ...
  • Large Truck Crash Analysis for Freight Mobility and Safety Enhancement in Florida
    Large Truck Crash Analysis for Freight Mobility and Safety Enhancement in Florida
    Jin, Xia ;
    Asgari, Hamidreza
    2019-05-01 | PDF
    This report summarizes the efforts and results of the research project “Large Truck Crash Analysis for Freight Mobility and Safety Enhancement in Florida”, which was intended to gain more understanding of the patterns and contributing factors of large truck crashes in Florida, to recommend practical countermeasures to reduce crashes involving freig ...
  • Influence of Aggregate Morphology and Grading on the Performance of 95mm Stone Matrix Asphalt Mixtures
    Influence of Aggregate Morphology and Grading on the Performance of 9.5-mm Stone Matrix Asphalt Mixtures
    Liu, Yufeng ;
    Nair, Harikrishnan
    2019-05-01 | PDF
    Stone matrix asphalt (SMA) is a gap-graded hot mix asphalt with a high percentage of coarse aggregate and a high asphalt content. SMA is the typical gap-graded mixture used in Virginia that is intended to maximize rutting resistance and durability with a stable stone-on-stone skeleton held together by a rich mixture of asphalt binder. The field per ...
  • Principal Components Analysis and Track Quality Index A Machine Learning Approach
    Principal Components Analysis and Track Quality Index: A Machine Learning Approach
    Lasisi, Ahmed ;
    Attoh-Okine, Nii
    2019-05-01 | PDF
    Track geometry data exhibits classical big data attributes: value, volume, velocity, veracity and variety. Track Quality Indices-TQI are used to obtain average-based assessment of track segments and schedule track maintenance. TQI is expressed in terms of track parameters like gage, cross level, etc. Though each of these parameters is objectively i ...
  • Rapid Concrete Repair
    Rapid Concrete Repair
    Quezada, Ivan ;
    Thomas, Robert J.
    2019-05-01 | PDF
    Investigations to develop a full depth durable concrete mixture (15 year life) to be used for pavement with four hour cure time and 4000 psi compressive strength that will minimize cracking were carried out. Current high early strength concrete mixtures have natural cracking and shrinkage problems due to the high content of cementitious material or ...
  • Develop Efficiencies and Versatilities for Roadway Drainage Maintenance
    Develop Efficiencies and Versatilities for Roadway Drainage Maintenance
    Elzarka, Hazem ;
    Chakraborty, Debaditya
    2019-05-01 | PDF
    ODOT maintains approximately 43,000 lane miles of roadside ditches creating significant constraints on budgets and labor. The aim of this research is to develop a more versatile and efficient process of cleaning/maintaining roadside ditches by increasing safety, optimizing labor hours, increasing flexibility of ditching process, and minimizing dama ...
  • Friction and Texture Retention of Concrete Pavements
    Friction and Texture Retention of Concrete Pavements
    Komaragiri, Satyavati ;
    Algarni, Ali
    2019-05-01 | PDF
    In the late 1980s and early 1990s, the Alabama Department of Transportation (ALDOT) noticed a decline in skid trailer numbers on concrete pavements shortly after grinding operations. The engineers at the time suspected that the coarse aggregate led to decline of skid trailer numbers and the resulting conclusion led to a ban of carbonate aggregates ...
  • Development of Safety Performance Functions for Restricted Crossing UTurn RCUT Intersections
    Development of Safety Performance Functions for Restricted Crossing U-Turn (RCUT) Intersections
    Ulak, Mehmet Baran ;
    Ozguven, Eren Erman
    2019-05-01 | PDF
    Conventional intersection designs are known to be problematic and unreliable when handling the complexity associated with the heavy traffic volume and travel demand on today’s roadways. Therefore, transportation agencies have been searching for more innovative and safer intersection design solutions in order to address these complex problems. One s ...
  • Interstate 10 Western Connected Freight Corridor Volume 1 Improvement Strategies
    Interstate 10 Western Connected Freight Corridor, Volume 1: Improvement Strategies
    Rutter, Allan ;
    Aldrete, Rafael
    2019-05-01 | PDF
    The Interstate 10 (I-10) western connected freight corridor extends from the Ports of Long Beach and Los Angeles in California to the Port of Beaumont in Texas. Collaborating through a Federal Highway Administration (FHWA) pooled fund study, the state departments of transportation in California, Arizona, New Mexico, and Texas (the I-10 Corridor Coa ...
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