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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 3661 - 3680 of 36011 results
  • Understanding the Transportation Mobility Needs for an Aging New Jersey Population Technical Brief
    Understanding the Transportation Mobility Needs for an Aging New Jersey Population [Technical Brief]
    Deka, Devajyoti ;
    Alexander, Karen
    2021-05-01 | PDF
    Older adults are considered transportation disadvantaged throughout the country because disabilities and low income prevent many of them from using transportation that can be conveniently used by younger people. New Jersey’s older adult population increased substantially during the past several decades and is expected to increase similarly in the f ...
  • Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks
    Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks
    Simonton, Eric ;
    Shearer, Christopher R
    2021-05-01 | PDF
    Concrete bridge decks in South Dakota have reduced services lives due to shrinkage cracking. This study evaluated the effects of varying concrete mix design parameters on shrinkage performance. Tested mix design changes include aggregate type (limestone and quartzite) and gradations (ASTM C33, Tarantula Curve, and 0.45 Power Curve), supplementary c ...
  • Development of Demand Estimation Models for the Virginia Department of Transportations Park and Ride Facilities
    Development of Demand Estimation Models for the Virginia Department of Transportation’s Park and Ride Facilities
    Xu, Yiqing ;
    Dougald, Lance E.
    2021-05-01 | PDF
    The construction and maintenance of park and ride lots represents a substantial public investment that if used judiciously can reduce congestion and emissions through the use of transit or the sharing of vehicle trips. With 297 lots scattered throughout Virginia, the Virginia Department of Transportation (VDOT) needs an approach for forecasting dem ...
  • Performance Base Testing for Erosion Prevention and Sediment Control EPSC Devices
    Performance Base Testing for Erosion Prevention and Sediment Control (EPSC) Devices
    Wilson, Christopher
    2021-05-01 | PDF
    To address excessive soil loss from roadway and other construction sites, several erosion prevention and sediment control practices exist. However, there is still a need for systematic performance evaluation methods that provide sound efficiency values for the different practices under a range of conditions. There is also the need for a transparent ...
  • Feasibility Study Alternatives to Prevent Settlements and Bumps at Bridge Approach
    Feasibility Study: Alternatives to Prevent Settlements and Bumps at Bridge Approach
    Kim, Seunghee ;
    Eun, Jongwan
    2021-05-01 | PDF
    This project aims to examine the feasibility of improving the current design practice of the approach slab foundation in Nebraska and the alternative of using geosynthetic reinforcement of soils to prevent the bump issues near the end of bridge approaches via an in-depth numerical simulation study. A large-scale pullout test is also conducted as co ...
  • Implementation of Geosynthetic Reinforced Soil Integrated Bridge System GRSIBS Technology in Alabama
    Implementation of Geosynthetic Reinforced Soil – Integrated Bridge System (GRS-IBS) Technology in Alabama
    Anderson, J Brian ;
    Montgomery, Jack
    2021-05-01 | PDF
    Geosynthetic Reinforced Soil-Integrated Bridge Systems (GRS-IBS) use closely spaced layers of geosynthetic reinforcement and compacted granular backfill to directly support a bridge deck and blend the abutment and roadway approach for a smooth transition. These systems are designed for areas where a single span is sufficient to bridge over a gap in ...
  • Unmanned Aircraft Systems UAS Metro District Bridge Inspection Implementation
    Unmanned Aircraft Systems (UAS) – Metro District Bridge Inspection Implementation
    Wells, Jennifer ;
    Lovelace, Barritt
    2021-05-01 | PDF
    Drones for bridge inspection research has been completed by MnDOT in multiple phases since 2015. As of summer, 2017, Phase III of this research began using the SenseFly Albris and the Flyability Elios, a collision-tolerant drone more suited to confined spaces such as box girders, culverts, or areas that are difficult to access. Due to the success o ...
  • Initial Investigation of Performance of Skewed Reinforcing in InvertedT Bridge Caps
    Initial Investigation of Performance of Skewed Reinforcing in Inverted-T Bridge Caps
    Roy, Satya Sapath ;
    Sawab, Jamshaid
    2021-05-01 | PDF
    Many reinforced concrete inverted-T bridge caps (ITBCs) are skew when two roads are not aligned perpendicularly and exceed the angle of 45 degrees based on the construction requirements. The Texas ITBCs are designed using the traditional empirical procedures outlined in the Texas Department of Transportation (TxDOT) Bridge Design Manual (TxDOT BDM) ...
  • Unbound Recycled Materials Database for MnPAVEFlexible
    Unbound Recycled Materials Database for MnPAVE-Flexible
    Zammarchi, Mattia ;
    Tompkins, Derek
    2021-05-01 | PDF
    This report documents the development of an electronic dataset describing field and laboratory performance of unbound bases from 106 road sections containing recycled materials in Minnesota. This dataset provides a compact view of backcalculated layer properties (from falling-weight deflection data) per road section. This view includes summary stat ...
  • Striping Materials Performance Curves Life Cycle Analysis
    Striping Materials Performance Curves – Life Cycle Analysis
    Cornejo, Ivan A
    2021-05-01 | PDF
    In this report, region-specific Retro-reflectivity Performance Curves are presented and discussed as a function of pavement marking materials, AADT, terrain, surface type, line color, line type, road bound direction, and road name. In addition, laboratory aging, and abrasion test results are presented and discussed. In addition to this written repo ...
  • Implementing Machine Learning With Highway Datasets
    Implementing Machine Learning With Highway Datasets
    Zhang, Yunfeng ;
    Cutts, Ross
    2021-05-01 | PDF
    Every year MDOT invests millions of dollars into testing geomaterials, digitizing historic records and capturing inventory and condition data. Massive amounts of tabular data, documentation and imagery, which are relevant for planning and engineering purposes, continue to be accumulated. The engineering characteristics of pavement or other material ...
  • Asphalt Mix Overlay Alternative for Low Volume Roads on the Local Transportation System
    Asphalt Mix Overlay Alternative for Low Volume Roads on the Local Transportation System
    Abbas, Ala R. ;
    Nazzal, Munir
    2021-05-01 | PDF
    This research project aimed to identify or develop a practical method for designing a well-performing hot mix asphalt (HMA) for use on low-volume local roads with severe cracking that can be produced in existing asphalt plants and can be placed using conventional paving equipment available in Ohio. This research project was conducted in two phases. ...
  • Development of a Tack Coat Quality Control Program for Mitigating Delamination in Asphalt Pavement Layers
    Development of a Tack Coat Quality Control Program for Mitigating Delamination in Asphalt Pavement Layers
    Kim, Y Richard ;
    Sudarsanan, Nithin
    2021-05-01 | PDF
    The importance of proper bonding at the asphalt concrete (AC) layer interface cannot be overemphasized when discussing the performance of AC pavements. The primary objective of this research is to develop a set of test procedure and acceptance criterion that can be used in a tack coat quality control (QC) program to mitigate debonding in asphalt pa ...
  • Unmanned Aerial Systems UAS for Transportation Incident Management and Infrastructure Assessment
    Unmanned Aerial Systems (UAS) for Transportation, Incident Management, and Infrastructure Assessment
    Helmicki, Arthur ;
    Hunt, Victor
    2021-05-01 | PDF
    Unmanned aerial systems (UAS) have received significant attention in recent years due to substantial advances in capabilities. The goal for this project has been to work with Drive Ohio and the Ohio UAS Center: (1) to identify those Ohio Department of Transportation (ODOT) core business functions which can be improved/enhanced by application of UAS ...
  • Field Demonstration of GPR and UAV Technologies for Evaluation of Two US 7577 Bridges
    Field Demonstration of GPR and UAV Technologies for Evaluation of Two US 75/77 Bridges
    Pashoutani, Sepehr ;
    Zhu, Jinying
    2021-05-01 | PDF
    Two Nebraska bridges with asphalt overlay were selected for nondestructive testing and evaluation (NDT/NDE). Three NDT techniques were conducted on these two bridges, including Ground Penetrating Radar (GPR), Half-Cell Potential (HCP) and Unmanned Aerial Vehicle (UAV) imaging. NDT data were collected during three construction stages of the bridges: ...
  • Understanding the Transportation Mobility Needs for an Aging New Jersey Population
    Understanding the Transportation Mobility Needs for an Aging New Jersey Population
    Deka, Devajyoti ;
    Alexander, Karen
    2021-05-01 | PDF
    This research was conducted with two broad objectives: (a) to identify the transportation mobility needs and barriers of older adults in New Jersey, and (b) to recommend innovative strategies to meet their transportation needs. To fulfill its objectives the research took resource to (a) literature review; (b) online research to review innovative mo ...
  • Summary Findings of ReEngineered Continuously Reinforced Concrete Pavement Volume 1
    Summary Findings of Re-Engineered Continuously Reinforced Concrete Pavement: Volume 1
    Roesler, Jeffery ;
    Dahal, Sachindra
    2021-05-01 | PDF
    This research project conducted laboratory testing on the design and impact of internal curing on concrete paving mixtures with supplementary cementitious materials and evaluated field test sections for the performance of crack properties and CRCP structure under environmental and FWD loading. Three experimental CRCP sections on Illinois Route 390 ...
  • Investigation on Wrong Way Driving Prevention Systems
    Investigation on Wrong Way Driving Prevention Systems
    Golias, Mihalis ;
    Mishra, Sabyasachee
    2021-05-01 | PDF
    Wrong-way driving (WWD) is an event where a vehicle enters a high-speed divided highway from an off-ramp in the direction opposing to the legal traffic flow. Although being less frequent than other crash type, WWD is significantly more fatal and in Tennessee, there are on average 20 WWD annually. Therefore, this report aims to first understand WWD ...
  • Strategies to Identify and Mitigate Secondary Crashes Using RealTime Traffic Data on Floridas Turnpike
    Strategies to Identify and Mitigate Secondary Crashes Using Real-Time Traffic Data on Florida's Turnpike
    Alluri, Priyanka ;
    Sando, Thobias
    2021-05-01 | PDF
    The primary goal of this research was to develop a comprehensive approach to identify and mitigate secondary crashes on the Florida Turnpike System in real time. The specific research objectives were to: (1) identify secondary crashes; (2) identify significant factors contributing to the occurrence of secondary crashes; (3) develop an algorithm tha ...
  • Concrete Bridge Deck Deterioration Assessment Using Ground Penetrating Radar
    Concrete Bridge Deck Deterioration Assessment Using Ground Penetrating Radar
    Hu, Da ;
    Li, Shuai
    2021-05-01 | PDF
    Ground penetrating radar (GPR) is a non-destructive technique that has been used to inspect and assess concrete bridge deck deterioration. The objective of this project is to investigate the use of GPR in concrete bridge deck inspection and develop semi-automated tools to process GPR data for detecting, mapping, and visualizing potential deteriorat ...
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