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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 7581 - 7600 of 36114 results
  • Advancing Implementation of Geosynthetic Reinforced SoilIntegrated Bridge Systems GrsIbs Tech Transfer Summary
    Advancing Implementation of Geosynthetic Reinforced Soil-Integrated Bridge Systems (Grs-Ibs): Tech Transfer Summary.
    Bowders, John ;
    Boeckmann, Andrew
    2017-10-01 | PDF
    The goal of this work is to advance the implementation of geosyntheticreinforced-soil integrated bridge systems (GRS-IBS) technology. The objectives were to document relevant technical literature, summarize transportation agency experiences, and evaluate the construction and early service life performance of a GRS-IBS.
  • Evaluation of Intersection Collision Warning Systems in Minnesota
    Evaluation of Intersection Collision Warning Systems in Minnesota
    Hallmark, Shauna L. ;
    Hawkins, Neal
    2017-10-01 | PDF
    The Minnesota Department of Transportation (MnDOT) is investing significant resources in intersection collision warning systems (ICWS) based on early indications of effectiveness. However, the effectiveness is not well documented, and negative changes in driver behavior at treatment intersections may affect drivers overall, resulting in a spillover ...
    Supporting Files
  • Does Compact Development Increase or Reduce Traffic Congestion
    Does Compact Development Increase or Reduce Traffic Congestion?
    Ewing, Reid ;
    Tian, Guang
    2017-10-01 | PDF
    From years of research, we know that compact development that is dense, diverse, well-designed, etc. produces fewer vehicle miles traveled (VMT) than sprawling development. But compact development also concentrates origins and destinations. No one has yet determined, using credible urban form metrics and credible congestion data, the net effect of ...
  • Fog Seal Performance on Asphalt Mixture Longitudinal Joints
    Fog Seal Performance on Asphalt Mixture Longitudinal Joints
    Haddock, John E. ;
    Montgomery, Sharlan R.
    2017-10-01 | PDF
    Due to the nature of construction, it is common for longitudinal joints in asphalt pavements to have lower densities and higher permeabilities than the main portions of the pavement lanes. To address this concern, many states employ joint sealant techniques such as fog seals or void reducing asphalt membranes (VRAM). Qualitative evidence in Indiana ...
  • Investigation of the Link Between Macroscopic Traffic Flow Characteristics and Individual Vehicle Fuel Consumption Tech Transfer Summary
    Investigation of the Link Between Macroscopic Traffic Flow Characteristics and Individual Vehicle Fuel Consumption : Tech Transfer Summary
    Dong, Jing
    ORCID ICON IMG
    2017-10-01 | PDF
    The objective of this project was to investigate the impacts of several factors, including vehicle characteristics, ambient temperature, season, speed, driving behavior, and traffic flow, on individual vehicle energy consumption.
  • Snowplow Operator and Supervisor Training Research Brief
    Snowplow Operator and Supervisor Training: Research Brief
    Grothaus, Jim
    2017-10-01 | PDF
    This project developed a comprehensive snowplow operator and supervisor training program that provides flexibility for states to modify or update the content as needed. The 22-module program covers equipment, materials, techniques and procedures.
  • Rural Transit Fact Book 2017
    Rural Transit Fact Book 2017
    Jeremy Mattson
    2017-10-01 | PDF
    This 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 can be used by agency managers, local decision makers, state directors, the Federal Transit Administration ( ...
  • Traffic Impact Assessment of Moving Work Zone Operations
    Traffic Impact Assessment of Moving Work Zone Operations
    Edara, Praveen ;
    Rahmani, Roozbeh
    2017-10-01 | PDF
    Road maintenance activities involve both short-term stationary work zones and moving work zones. Moving work zones typically involve striping, sweeping, pothole filling, shoulder repairs, and other quick maintenance activities. Existing traffic analysis tools for work zone scheduling are not designed to model moving work zones. A review of existing ...
  • Analysis of Driven Pile Capacity within PreBored Soil Research Project Capsule
    Analysis of Driven Pile Capacity within Pre-Bored Soil : Research Project Capsule
    Chen, Shengli
    ORCID ICON IMG
    2017-10-01 | PDF
    Pre-boring is a method used to facilitate large displacement pile driving in hard/dense soils (see Figure 1). By pre-boring a pilot hole, the end bearing and side friction within the pre-bored zone are reduced, thus aiding pile driving installation. However, pre-boring complicates the prediction of pile drivability and long-term pile capacity withi ...
  • Racial Bias in Drivers Yielding Behavior at Crosswalks Understanding the Effect
    Racial Bias in Drivers' Yielding Behavior at Crosswalks : Understanding the Effect
    Kahn, Kimberly Barsamian ;
    McMahon, Jean
    2017-10-01 | PDF
    This project explores social identity factors (race and gender) that influence drivers' behavior in interactions with pedestrians at crosswalks. One dangerous potential point of conflict for pedestrians within the transportation system is interactions with drivers at crosswalks (NHTSA, 2009). In 2010, there was one crash-related pedestrian death ev ...
  • Establishment of effective control factors to achieve federal enforcement consistency with the Highway Beautification Act a final report submitted to Florida Department of Transportation Right of Way Division
    Establishment of effective control factors to achieve federal enforcement consistency with the Highway Beautification Act : a final report submitted to Florida Department of Transportation, Right of Way Division.
    Dulebenets, Maxim A. ;
    Ozguven, Eren Erman
    2017-10-01 | PDF
    The Highway Beautification Act, which was enforced in 1965, aims to establish an efficient outdoor advertising control(OAC) program for erection and maintenance of the outdoor advertising signs, displays and devices, which are located in aclose proximity to the National Interstate System. The Highway Beautification Act outlines a set of requirement ...
  • Highway Cost Index Estimator Tool
    Highway Cost Index Estimator Tool
    Huntsman, Brent ;
    Glover, Brianne
    2017-10-01 | PDF
    To plan and program highway construction projects, the Texas Department of Transportation requires accurate construction cost data. However, due to the number of, and uncertainty of, variables that affect highway construction costs, estimating future funding needs can be an exceedingly difficult task. This research project sought to improve future ...
  • Installing Snowplow Cameras and Integrating Images into MnDOTs Traveler Information System
    Installing Snowplow Cameras and Integrating Images into MnDOT's Traveler Information System
    Hirt, Brian ;
    Petersen, Scott
    2017-10-01 | PDF
    In 2015 and 2016, the Minnesota Department of Transportation (MnDOT) installed network video dash- and ceiling-mounted cameras on 226 snowplows, approximately one-quarter of MnDOT's total snowplow fleet. The cameras were integrated with the onboard mobile data computer/automated vehicle location (MDC/AVL) equipment and automatically captured snapsh ...
  • Implementation of Maturity for Concrete Strength Measurement and Pay
    Implementation of Maturity for Concrete Strength Measurement and Pay
    Collier, Zachary ;
    Rupnow, Tyson D.
    2017-10-01 | PDF
    The current construction climate continually requires a more rapid response time for concrete form removal, early age strengths, and opening strengths. This project piloted the maturity method on one structural project and one pavement rehabilitation project. As part of the implementation project, district personnel were taught about the use of mat ...
  • Successes in Stewardship Back to the Basics The Endangered Species Act and Section 7 Consultations
    Successes in Stewardship - Back to the Basics: The Endangered Species Act and Section 7 Consultations
    United States. Federal Highway Administration
    2017-10-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Sign LifeCycle Policies and Practices Transportation Research Synthesis
    Sign Life-Cycle Policies and Practices : Transportation Research Synthesis
    CTC & Associates LLC  ...
    2017-10-01 | PDF
    MnDOT Metro District Traffic Engineering is interested in the practices that other state departments of transportation (DOTs) use to determine traffic sign life expectancy and replacement. Of particular interest is the state of the practice regarding traffic sign colors, life cycles and management, specifically whether signs are selected for replac ...
  • Exploring the Use of Lidar Data From Autonomous Cars for Estimating Traffic Flow Parameters and Vehicle Trajectories
    Exploring the Use of Lidar Data From Autonomous Cars for Estimating Traffic Flow Parameters and Vehicle Trajectories
    Cetin, Mecit ;
    Sazara, Cem
    2017-10-01 | PDF
    LIDAR has become one of the major enabling technologies for autonomous vehicles. LIDAR sensors generate 3D point cloud data around the instrumented vehicle. These data enable detailed localization of both fixed and moving objects in the surrounding environment. In this project, various aspects of LIDAR data processing are studied with an emphasis o ...
  • Stormwater Infiltration in Highway Embankments Saturated Hydraulic Conductivity Estimation for Uncompacted and Compacted Soils
    Stormwater Infiltration in Highway Embankments – Saturated Hydraulic Conductivity Estimation for Uncompacted and Compacted Soils
    Allen, Tony M.
    2017-10-01 | PDF
    The estimation of hydraulic conductivity (Ksat) is a key step to assess the rate of infiltration, whether that estimate is for an infiltration pond or trench, if it is for a highway embankment, or if it is for natural dispersion in general. The focus of this research is to assess available methods for estimating Ksat, especially with regard to the ...
  • National Performance Management Research Dataset NPMRDS Speed Validation for Traffic Performance Measures
    National Performance Management Research Dataset (NPMRDS) - Speed Validation for Traffic Performance Measures
    Refai, Hazem H. ;
    Bitar, Naim
    2017-10-01 | PDF
    This report presents research detailing the use of the first version of the National Performance Management Research Data Set (NPMRDS v.1) comprised of highway vehicle travel times used for computing performance measurements in the state of Oklahoma. Data extraction, preprocessing, and statistical analysis were performed on the dataset and a compre ...
  • Automated Data Collection for OriginDestination Studies of Freight Movement Phase 2
    Automated Data Collection for Origin/Destination Studies of Freight Movement, Phase 2
    Oloufa, Amr A. ;
    Laman, Haluk
    2017-10-01 | PDF
    Origin and destination (O–D) include the start and end points and times of any vehicular trip. These data are valuable to traffic modelers and transportation planners. The collection of O–D data usually comes from surveys, visual counts, classifier counts, or other methods. These methods of collection tend to be expensive and time consuming. The ai ...
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