The 32-in. (813-mm) concrete parapet has a flat vertical traffic face with a thickened section along the top. The flat vertical face serves to smoothly redirect vehicles without imparting upward force on the vehicle. It was designed and tested to performance level two of the 1989 AASHTO Guide Specifications for Bridge Railings. Acceptable performan
...
The following summary of the Federal Highway Administration bridge and structures related research program is provided for your general use and information. The goal of the research program is to develop a range of technologies to not only preserve and maintain our nation's bridges and structures, but to advance and develop new materials, new inspe
...
This report presents the results of a State Planning and Research (SP&R) pooled-fund study to develop safer bridge rail and transition designs. This pooled-fund study was sponsored by the Federal Highway Administration, 23 States, and the District of Columbia. A panel of representatives from those agencies selected the designs to be studied. Ten br
...
This report presents the results of a State Planning and Research (SP&R) pooled-fund study to develop safer bridge rail and transition designs.This pooled-fund study was sponsored by the Federal Highway Administration, 23 States, and the District of Columbia. A panel of representatives from those agencies selected the designs to be studied.Ten brid
...
The Atlanta metropolitan region is the location of one of the most ambitious intelligent transportation system (ITS) deployments in the United States. The system links eight regional agencies and includes a transportation management center (TMC), six traffic control centers (TCC), and a transit information center (TIC). In addition, regional Advanc
...
The number of motor vehicles available to a household has a major impact on the travel behavior of the members of the household. As a result, many metropolitan planning organizations have incorporated models of household vehicle availability or automobile ownership into their travel forecasting model systems. This report summarizes the current stat
...
This report documents the activities and results of a 2-year test of non-intrusive traffic detection technologies. The test was initiated by the Federal Highway Administration (FHWA) and conducted by the Minnesota Department of Transportation (Mn/DOT) and SRF Consulting Group, Inc. (SRF). The main goal is to provide practitioners with useful inform
...
This memorandum provides information about Federal Highway Administration (FHWA) procurement methods which can be successfully used for Intelligent Transportation Systems (ITS) projects.
In today’s increasingly competitive economic environment, effective management of commercial vehicle fleets is important for all types of carriers and for the trucking industry as a whole. To meet fleet management needs, carriers increasingly are turning to intelligent transportation systems (ITS) technologies. ITS technologies can enhance the comp
...
The Long-Term Pavement Performance Information Management System (LTPP IMS) Data Users Reference Manual contains an overview of the LTPP program and the data available to researchers. LTPP is a 20-year study of pavements to improve design, rehabilitation, and maintenance practices. This document is intended to assist researchers in understanding th
...
Research has been conducted on the potential improvement of dynamic wave equation analysis methodology using in-situ soil testing techniques. As a basis for this investigation, the literature was reviewed and a summary was compiled of efforts made to date on the development of models and associated parameters for pile driving analysis. Furthermore
...
Research has been conducted on the potential improvement of dynamic wave equation analysis methodology using in-situ soil testing techniques. As a basis for this investigation, the literature was reviewed and a summary was compiled of efforts made to date on the development of models and associated parameters for pile driving analysis. Furthermore
...
A major cause of concrete deterioration on bridge structures is the corrosion of the embedded steel reinforcement. In response to the continued problem of corrosion, the Federal Highway Administration (FHWA) initiated this research aimed at (1) quantifying the corrosive conditions fostering concrete bridge deterioration and (2) identifying concrete
...
Two studies were conducted to determine the visibility and comprehension of pedestrian signals. A video questionnaire was developed to study the comprehension of innovative and standard pedestrian crosswalk devices. Results indicated that green and red are interchangeable in meaning with white and orange, respectively. A red "slash man" appears to
...
This report presents an evaluation of the performance SHRP SPS-3 and SPS-4 experiment sites based on field reviews after 5 years of performance. Condition evaluation of the section and Expert Task Group performance estimates are the basis for treatment assessments.
A new technology is being developed in Sweden to improve visibility for nighttime driving. This technology consists of Ultraviolet (UV) headlights in combination with fluorescent traffic control devices. Vehicles will be equipped with headlamps that supply UV radiation in a high-beam pattern, along with conventional halogen or metal halide low-beam
...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.