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Recent Additions
This page includes the documents that were newly added to the repository within the last 30 days.
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  • Diverging Diamond Interchange and Double Crossover Intersection - Vehicle and Pedestrian Performance
    Published:
    2005-01-01
    Abstract:
    Transportation planners and traffic engineers are facing the challenge of inventing ways to mitigate congestion during peak hours. Alleviating delays and improving safety for passengers and pedestrians is the primary motive. One way of achieving this...
    File Type:
    Filetype[PDF - 951.21 KB]
    Added:
    07/22/2019
  • Law Enforcement Strategies for Mitigating Highway-Rail Grade Crossing Risk Factors
    Published:
    2019-06-01
    Abstract:
    There has been heightened awareness of and re-commitment to highway-rail grade crossing safety. Both the U.S. Department of Transportation and the Federal Railroad Administration have pledged to show a greater presence at grade crossings and to adopt...
    File Type:
    Filetype[PDF - 942.07 KB]
    Added:
    07/22/2019
  • Understanding Transportation Related Infrastructure Access in 52 Major US Cities
    Published:
    2019-04-01
    Abstract:
    Transit deserts are urban areas with poor transportation related infrastructure access. In these areas, transit demands usually exceed transit supplies. In this project we refined the concept of transit deserts further and introduce the new concept o...
    File Type:
    Filetype[PDF - 1.47 MB]
    Added:
    07/22/2019
  • CARMA Testing and Evaluation of Research Mobility Applications
    Published:
    2019-07-01
    Abstract:
    This report presents the results of a test and evaluation effort that assessed the performance of three research mobility applications implemented by the open-source second-generation Cooperative Automation Research Mobility Applications (CARMA2) pla...
    File Type:
    Filetype[PDF - 3.63 MB]
    Added:
    07/22/2019
  • Distribution of The FHWA GRS-IBS Construction Video
    Published:
    2011-10-17
    Abstract:
    The memorandum announces the availability of the Geosynthetic Reinforced Soil Integrated Bridge System (GRS-IBS) Construction DVD that supports the FHWA's Every Day Counts (EDC) initiative on this technology.
    File Type:
    Filetype[PDF - 269.76 KB]
    Added:
    07/22/2019
  • Using WIM Systems and Tube Counters to Collect and Generate ME Traffic Data for Pavement Design and Analysis: Technical Report
    Published:
    2019-04-01
    Abstract:
    Axle load spectra data, typically from permanent weigh-in-motion (WIM) stations, constitute the primary mechanistic-empirical (ME) traffic data input for accurate and optimal pavement design and analysis. However, due to the limited number of availab...
    File Type:
    Filetype[PDF - 3.16 MB]
    Added:
    07/22/2019
  • Crash Testing and Evaluation of Retrofit Bridge Railings and Transition
    Published:
    1996-01-01
    Abstract:
    An assortment of retrofit bridge railings and a retrofit transition were evaluated through full-scale crash testing. The assortment included: (1) a W-beam retrofit railing for a concrete baluster bridge railing (AASHTO performance level one); (2) a W...
    File Type:
    Filetype[PDF - 21.32 MB]
    Added:
    07/22/2019
  • Identifying Roadway Physical Characteristics that Contribute to Emissions Differences between Hybrid and Conventional Vehicles
    Published:
    2019-04-01
    Abstract:
    In this study, a second-by-second (SbS) data set obtained from monitoring vehicle emissions over a series of 75 test runs from 2 test vehicles (a conventional vehicle (CV) and a hybrid-electric vehicle (HEV)) over an 18-month period in 2010-2011 duri...
    File Type:
    Filetype[PDF - 513.87 KB]
    Added:
    07/22/2019
  • An Investigation of The Use of Differential Global Positioning System (GPS) Technology and its Augmentations within State and Local Transportation Departments (updated version)
    Published:
    2000-07-01
    Abstract:
    This report summarizes the results of an investigation conducted by the Federal Highway Administration's (FHWA's) Office of Operations Research and Development at the Turner-Fairbank Highway Research Center (TFHRC). This investigation targets the evo...
    File Type:
    Filetype[PDF - 172.92 KB]
    Added:
    07/22/2019
  • Identifying transit deserts in major Texas cities where the supplies missed the demands
    Published:
    2017-10-01
    Abstract:
    Coined by the author, the concept “transit desert” is developed from the now common concept of a “food desert,” which is an area where there is limited or no access to fresh food (Clark et al. 2002; Jiao et al. 2012; Whelan et al. 2002; Wrigl...
    File Type:
    Filetype[PDF - 1.52 MB]
    Added:
    07/22/2019
  • Safety Evaluation of Profiled Thermoplastic Pavement Markings
    Published:
    2017-12-01
    Abstract:
    This research examined the safety impacts of profiled thermoplastic pavement markings in Florida and South Carolina. The States applied the markings only on edge lines and mostly on rural, two-lane undivided roads, with some use on rural, multilane d...
    File Type:
    Filetype[PDF - 1.19 MB]
    Added:
    07/22/2019
  • Ultra-High Performance Concrete for Bridge Deck Overlays
    Published:
    2018-02-01
    Abstract:
    This TechNote introduces ultra-high performance concrete (UHPC) as a potential solution for bridge deck overlays. A brief review of the history and development of UHPC is presented, followed by a summary of the properties that make UHPC a viable over...
    File Type:
    Filetype[PDF - 632.04 KB]
    Added:
    07/22/2019
  • Product Brief: DataPave 3.0: User-Friendly Access to LTPP Data
    Published:
    2001-11-01
    Abstract:
    For more than a decade, the Long Term Pavement Performance (LTPP) program and participating State and Provincial highway agencies have been collecting data from thousands of LTPP test sections across the United States and Canada. In 1998, a CD-ROM so...
    File Type:
    Filetype[PDF - 363.13 KB]
    Added:
    07/22/2019
  • Soil and Base Stabilization and Associated Drainage Considerations, Volume II, Mixture Design Considerations
    Published:
    1992-12-01
    Abstract:
    This report consists of two volumes: Volume I, Pavement Design and Construction Considerations; and Volume II, Mixture Design Considerations. These Two volumes represent the revisions to the original manuals prepared in 1979 by Terrel, Epps, Barenber...
    File Type:
    Filetype[PDF - 43.60 MB]
    Added:
    07/22/2019
  • Soils and Foundations Reference Manual – Volume II
    Published:
    2006-12-01
    Abstract:
    The Reference Manual for Soils and Foundations course is intended for design and construction professionals involved with the selection, design and construction of geotechnical features for surface transportation facilities. The manual is geared towa...
    File Type:
    Filetype[PDF - 12.47 MB]
    Added:
    07/22/2019
  • Focus [December 2013]
    Published:
    2013-12-01
    Abstract:
    Focus (ISSN 1060-6637), which is published monthly by the U.S. Department of Transportation’s Federal Highway Administration (FHWA), covers the implementation of innovative technologies in all areas of infrastructure. Its primary mission is twofold...
    File Type:
    Filetype[PDF - 240.86 KB]
    Added:
    07/22/2019
  • Rock and Mineral Identification for Engineers
    Published:
    1991-11-01
    Abstract:
    This guide can help practicing civil engineers to identify rocks and minerals and to better understand their characteristics and performances in certain applications. The equipment needed for the procedures in this guide is inexpensive and easily obt...
    File Type:
    Filetype[PDF - 5.58 MB]
    Added:
    07/22/2019
  • NCHRP Report 350 Compliance Test 5–12 of the 1.07-m Vertical Wall Bridge Railing
    Published:
    1997-01-01
    Abstract:
    FHWA recently adopted new performance evaluation guidelines for roadside safety features set forth in NCHRP Report 350. Most of the existing roadside features were tested according to the previous guidelines contained in NCHRP Report 230 and there ar...
    File Type:
    Filetype[PDF - 2.31 MB]
    Added:
    07/22/2019
  • What Makes Portland Cement Concrete (PCC) Pavements Rough?
    Published:
    1998-12-01
    Abstract:
    Roughness is widely regarded as the most important measure of pavement performance. To better understand how and why roughness occurs in pavements, Long Term Pavement Performance (LTPP) program recently completed a study entitled, "Investigation of D...
    File Type:
    Filetype[PDF - 56.23 KB]
    Added:
    07/22/2019
  • Traffic Research Laboratory (TReL) Fact Sheet
    Published:
    2005-06-01
    Abstract:
    The Traffic Research Laboratory (TReL) is a unique combination of advanced hardware and software systems that can be used by researchers and practicing traffic engineers to assess and evaluate the impact of various combinations of advanced technologi...
    File Type:
    Filetype[PDF - 619.99 KB]
    Added:
    07/22/2019
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