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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 7341 - 7360 of 36114 results
  • A Primer on Modeling in the Coastal Environment
    A Primer on Modeling in the Coastal Environment
    Webb, Bret M.
    2017-12-29 | PDF
    This manual provides an introduction to coastal hydrodynamic modeling for transportation engineering professionals. The information presented in this manual can be applied to better understand the use of numerical models in the planning and design of coastal highways. Here, the term “coastal highways” is meant to generally capture the roads, bridge ...
  • Risk Based Framework for Geotechnical Asset Management
    Risk Based Framework for Geotechnical Asset Management
    Vessely, Mark
    2017-12-28 | PDF
    This report presents the outcome from a multi-year research study to incorporate a risk management framework for the Alaska Department of Transportation & Public Facilities Geotechnical Asset Management (GAM) Plan. The GAM Plan was developed by Paul D. Thompson (Thompson, 2017). Concurrently to this work, Landslide Technology has completed a concur ...
  • Locating Portable Stations to Support the Operation of Bike Sharing Systems
    Locating Portable Stations to Support the Operation of Bike Sharing Systems
    Walteros, Jose ;
    Swamy, Rahul
    2017-12-26 | PDF
    Redistributing bikes has been a major challenge for the daily operation of bike sharing system around the world. Existing literature explore solution strategies that rely on pick-up-and-delivery routing as well as user incentivization approaches. The key contribution of this work is to introduce the use of portable bike stations to augment the capa ...
  • InSitu Monitoring of InfiltrationInduced Instability of I70 Embankment West of the EisenhowerJohnson Memorial Tunnels Phase II
    In-Situ Monitoring of Infiltration-Induced Instability of I-70 Embankment West of the Eisenhower-Johnson Memorial Tunnels, Phase II
    Wayllace, Alexandra ;
    Lu, Ning
    2017-12-25 | PDF
    Infiltration-induced landslides are common hazards to roads in Colorado. A new methodology that uses recent advances in unsaturated soil mechanics and hydrology was developed and tested. The approach consists of using soil suction and moisture content field information in the prediction of the likelihood of landslide movement. The testing ground wa ...
  • IPE EVALUATION OF ORTHOTROPIC ELASTIC PROPERTIES AND ITS APPLICATION IN ROADSIDE BARRIERS
    IPE : EVALUATION OF ORTHOTROPIC ELASTIC PROPERTIES AND ITS APPLICATION IN ROADSIDE BARRIERS
    Lankford, Robert
    2017-12-24 | PDF
    Roadside barriers are the primary structural safety devices on surface roads. They can be made from any material as long as they can absorb the energy involved in an impact scenario. One material that has that potential is Ipe, which is a hardwood material that has relatively high strength compared with common structural woods. Despite its high str ...
    Supporting Files
  • Effect of EarlyAge Concrete Elastic Properties on Fatigue Damage in PCC Pavements Containing Fibers
    Effect of Early-Age Concrete Elastic Properties on Fatigue Damage in PCC Pavements Containing Fibers
    Issa, Mohsen A.
    2017-12-24 | PDF
    The Illinois Department of Transportation (IDOT) is revising current specifications for opening new PCC (Portland cement concrete) pavements to traffic. These revisions will help keep closure times at a minimum by specifying the required concrete strength for resisting early-age fatigue damage. An extensive experimental program was conducted at the ...
  • Use of Steel FiberReinforced Rubberized Concrete in Cold Regions
    Use of Steel Fiber-Reinforced Rubberized Concrete in Cold Regions
    Abaza, Osama ;
    Eid, Mahear
    2017-12-24 | PDF
    This report documents and presents the use of steel fiber-reinforced rubberized concrete (SFRRC) in cold regions. Further investigation of SFRRC use was conducted with the wheel tracker rut and freeze-thaw laboratory testing procedures at the University of Alaska Anchorage. Wheel tracker results showed significant rutting improvement in SFRRC compa ...
  • Replaceable Unbonded Tendons for PostTensioned Bridges
    Replaceable Unbonded Tendons for Post-Tensioned Bridges
    Hamilton, H. R. ;
    Rice, J. A.
    2017-12-24 | PDF
    Prestressed concrete is widely used as a cost-effective and efficient method of bridge construction and offers a number of unique advantages over other systems. Florida Department of Transportation (FDOT) is implementing the use of flexible fillers in lieu of cementitious grout in certain post-tensioning tendon profiles. This research was divided i ...
    Supporting Files
  • Applicability of Zipper Merge Versus Early Merge in Kentucky Work Zones
    Applicability of Zipper Merge Versus Early Merge in Kentucky Work Zones
    Lammers, Erin ;
    Pigman, Jerry G.
    2017-12-24 | PDF
    In an effort to improve work zone safety and streamline traffic flows, a number of state transportation agencies (STAs) have experimented with the zipper merge. The zipper merge differs from a conventional, or early, merge in that vehicles do not merge into the lane that remains open immediately after being notified of a lane closure. Rather, vehic ...
  • Battery Electric Vehicles and DC Fast Charging Infrastructure Needs and Feasibility in Nebraska
    Battery Electric Vehicles and DC Fast Charging Infrastructure: Needs and Feasibility in Nebraska
    Alahmad, Mahmoud ;
    McCollister, Anne
    2017-12-22 | PDF
    A key factor to increase market penetration of battery electric vehicles (EVs) and support the electrification of transportation at scale is to increase the number and output capabilities of Electric Vehicle Charging Stations (EVSE) deployed in public spaces. In other words, an adequate public charging infrastructure is needed to effectively extend ...
  • Updating Physical and Chemical Characteristics of Fly Ash for Use in Concrete
    Updating Physical and Chemical Characteristics of Fly Ash for Use in Concrete
    Tanikella, Prasanth ;
    Olek, Jan
    2017-12-22 | PDF
    When incorporated in concrete mixtures, fly ashes are known to influence both its fresh and hardened properties. An accurate and quick technique to predict the extent of this influence based on the characteristics of fly ash would be highly beneficial in terms of field applications. The current study was an attempt to quantify the effects of fly as ...
  • Optimal Dredge Fleet Scheduling Phase 2
    Optimal Dredge Fleet Scheduling, Phase 2
    Rainwater, Chase ;
    Nachtmann, Heather
    2017-12-21 | PDF
    The U.S. Army Corps of Engineers (USACE) annually spends more than 100 million dollars on dredging hundreds of navigation projects on more than 12, 000 miles of inland and intra-coastal waterways. This project expands on a recently developed constraint programming framework to allow for dredge resource planning over multiple years. Decision-making ...
  • The Effect of Weather Events on Truck Traffic Patterns Using Fixed and Mobile Traffic Sensors
    The Effect of Weather Events on Truck Traffic Patterns Using Fixed and Mobile Traffic Sensors
    Hernandez, Sarah ;
    Akter, Taslima
    2017-12-20 | PDF
    Severe weather conditions, i.e. snowfall, floods, ice storms, etc. can have major effects on traffic volumes along the highway network. Unlike passenger vehicles, which may choose not to travel during inclement weather, freight trucks need to adhere to delivery schedules requiring them to alter their route rather than cancel a trip. While previous ...
  • AASHTOWare Preconstruction Preliminary Investigation
    AASHTOWare Preconstruction Preliminary Investigation
    Jarvis, Sara
    2017-12-17 | PDF
    The AKDOT&PF Northern Region construction section has successfully implemented AASHTOWare SiteManager on all construction projects. This project is to investigate and test the AASHTOWare Preconstruction module for statewide implementation. This project researched the extraction and potential migration of AKDOT&PF data into AASHTOWare. In addition, ...
  • Air Quality Benefits of Nighttime Construction in Texas NonAttainment CountiesTechnical Report
    Air Quality Benefits of Nighttime Construction in Texas Non-Attainment Counties--Technical Report.
    Farzaneh, Reza ;
    Ramani, Tara
    2017-12-15 | PDF
    The practice of performing some work zone activities at night has existed in the United States since at least the 1960s. Night work is most commonly initiated where it is impractical to close traffic lanes on certain high-volume roadways during normal daylight hours. Currently, there is no comprehensive evaluation of the changes in emissions associ ...
  • Modified Standard Penetration Testbased Drilled Shaft Design Method for Weak Rocks Phase 2 Study
    Modified Standard Penetration Test–based Drilled Shaft Design Method for Weak Rocks (Phase 2 Study)
    Stark, Timothy D. ;
    Long, James H.
    2017-12-15 | PDF
    In this project, Illinois-specific design procedures were developed for drilled shafts founded in weak shale or rock. In particular, a modified standard penetration test was developed and verified to characterize the in situ condition of weak shales or rocks inIllinois for drilled shaft design. For this project, weak shale or rock is defined as an ...
  • Determination of InSitu Compressive Strength of Precast Concrete Girders
    Determination of In-Situ Compressive Strength of Precast Concrete Girders
    Al-Manaseer, Akthem ;
    Cutay, Carmen Nathalie A
    2017-12-15 | PDF
    Verification of field compressive strength of precast concrete girders from 52 bridges in seven counties in California are presented. Nondestructive Testing (NDT) methods used are Proceq’s Silver Schmidt Rebound Hammer and Ultrasonic Pulse Velocity (UPV) and James Instruments’ Windsor Pin and Windsor Probe Systems. NDT tests were performed on concr ...
  • Peak Discharge Flood Frequency and Peak Stage of Floods on Big Cottonwood Creek at US Highway 50 Near Coaldale Colorado and Fountain Creek below US Highway 24 in Colorado Springs Colorado 2016
    Peak Discharge, Flood Frequency, and Peak Stage of Floods on Big Cottonwood Creek at U.S. Highway 50 Near Coaldale, Colorado, and Fountain Creek below U.S. Highway 24 in Colorado Springs, Colorado, 2016
    Kohn, Michael S. ;
    Stevens, Michael R.
    2017-12-14 | PDF
    The U.S. Geological Survey (USGS), in cooperation with the Colorado Department of Transportation, determined the peak discharge, annual exceedance probability (flood frequency), and peak stage of two floods that took place on Big Cottonwood Creek at U.S. Highway 50 near Coaldale, Colorado (hereafter referred to as “Big Cottonwood Creek site”), on A ...
  • A Comprehensive Field Guide for Reconfiguration of Mse Reinforcement Around Obstructions
    A Comprehensive Field Guide for Reconfiguration of Mse Reinforcement Around Obstructions
    Jayawickrama, Priyantha W. ;
    Ghebrab, Tewodros
    2017-12-12 | PDF
    This document provides guidelines for reconfiguration of earth reinforcements to avoid obstructions found within the reinforced fill during Mechanically Stabilized Earth (MSE) wall construction. The guidance provided herein is intended to assist Texas Department of Transportation (TxDOT) design engineers, consultants, MSE wall suppliers, contractor ...
  • Recycled Glass Fiber Reinforced Polymer Composites Incorporated in Mortar for Improved Mechanical Performance
    Recycled Glass Fiber Reinforced Polymer Composites Incorporated in Mortar for Improved Mechanical Performance
    Rodin, Harry, III ;
    Nassiri, Somayeh
    2017-12-11 | PDF
    Glass fiber reinforced polymer (GFRP) recycled from retired wind turbines was implemented in mortar as a volumetric replacement of sand during the two phases of this study. In Phase I, the mechanically refined GFRP particle sizes were sieved for four size groups to find the optimum size. In Phase II, the select GFRP size group was incorporated at t ...
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