Evaluation of High-speed Isolated Signalized Intersections in California
Evaluation of High-speed Isolated Signalized Intersections in California

Author: Simon Washington

Publisher:

Published: 1991

Total Pages: 162

ISBN-13:

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High-speed isolated signalized intersections (HSISI's) are generally encountered after long uninterrupted and uncongested flow conditions, thereby catching some motorists by surprise. For this reason alone, approaches to HSISI's need to have safe and effective warning, control, and intersection geometric treatments. This research identified characteristics at California HSISI's that relate to accident rates. A data base consisting of approximately 100 intersection and approach variables was established and used to investigate advance warning, signal timing and phasing, channelization, signal equipment configurations, shoulder widths and types, median widths and types, and approach speeds.

Evaluation of Detection and Signing Systems for High Speed Signalized Intersections
Evaluation of Detection and Signing Systems for High Speed Signalized Intersections

Author: Prahlad D. Pant

Publisher:

Published: 1996

Total Pages: 248

ISBN-13:

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The effects of two dynamic signs that begin to flash a few seconds before the onset of the yellow interval and a static sign that flashes all the time were examined at tangent and curved approaches to rural, high speed signalized intersections. The dynamic signs included (a) a PTSWF (prepare to stop when flashing) sign, and (b) a FSSA (flashing symbolic signal ahead) sign with green, yellow, and red circles. The static sign was a CFSSA (continuously flashing symbolic signal ahead) sign with the three circles. The effects of these signs on vehicular speeds at different segments of the intersection approach including the dilemma zone were analyzed as were the vehicle conflict rates and the responses from the drivers' surveys.

Evaluation of Advance Warning Signal Installation
Evaluation of Advance Warning Signal Installation

Author:

Publisher:

Published: 2006

Total Pages: 232

ISBN-13:

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Advance warning signals installed upstream of a high-speed signalized intersection (HSSI) warn motorists of impending signal changes in an effort to reduce the frequency of red-light running (RLR) and crashes. The new design utilized an overhead dynamic blank-out sign and flashers. A state-of-the-art Digital Wave RadarTM evaluation system was installed at the study site to collect continuous data of vehicle speeds and RLR events by a non-intrusive method. -- Abstract.

Evaluation and Installation Guidelines for Advance Warning Signal Systems in Utah
Evaluation and Installation Guidelines for Advance Warning Signal Systems in Utah

Author: Aaron Paul Jensen

Publisher:

Published: 2007

Total Pages: 120

ISBN-13:

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Advance warning signals (AWS) provide information warning drivers in advance of the end-of-green phase for an approaching signalized intersection. The purpose of this research was to develop guidelines for the placement of AWS in Utah, both conditions to evaluate the need for AWS installation and guidelines for the AWS system design. The conditions were based on literature of other transportation agencies that had similar AWS systems and were developed using the Policy Delphi method. The Policy Delphi method is the development of a specific policy area through the means of discussion by a committee of experts correlating views and information involving opportunity to react and assess different viewpoints until the committee is in agreement over the policies being recommended. Six conditions are recommended and discussed in detail, including: limited sight distance, posted speed, isolated intersection, high crash rate, approach grade, and heavy vehicle traffic volume. The guidelines for the AWS system design included details about three components: AWS component, advance detection component, and signal timing component. An evaluation matrix was developed by the Policy Delphi method for the purpose of evaluating and prioritizing a group of intersections for AWS installation. A total of 24 intersections were identified by the Utah Department of Transportation for this project that helped to develop and verify the conditions and evaluation matrix. The recommended guidelines and evaluation matrix results are described.

Traffic Control Devices, Visibility, and Railroad Grade Crossings
Traffic Control Devices, Visibility, and Railroad Grade Crossings

Author: National Research Council (U.S.). Transportation Research Board

Publisher:

Published: 1997

Total Pages: 144

ISBN-13:

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Transportation Research Record 1495 contains the following papers: Effective use of variable message signs: Lessons learned through development of users' manuals; Motorist interpretation of yellow X and yellow diagonal arrow in freeway lane control signal array; Effects of pavement markings on driver behavior at freeway lane drop exits; Comparative study of advance warning signs at high speed signalized intersections; Evaluation of strobe lights in red lens of traffic signals; High-volume pedestrian crosswalk time requirements; Empirical analysis of traffic characteristics at two-way stop-controlled intersections in Alaska; Evaluation of proposed minimum retroreflectivity requirements for traffic signs; Detectability of pavement markings under stationary and dynamic conditions as a function of retroreflective brightness; Visibility of new yellow center stripes as a function of obliteration; Effects of lateral separation between double center-stripe pavement markings on visibility under nighttime driving conditions; Curve radius perception accuracy as function of number of delineation devices (Chevrons); Knowledge-based personal computer software package for applying and placing curve delineation devices; Visibility of new pavement markings at night under low-beam illumination; Loss of visibility distance caused by automobile windshields at night; Traffic sign reading distances and times during night driving; Yellow pavement markings with yellow nighttime color; Application of geographic information systems rail-highway grade crossing safety; Evaluation of accuracy of U.S. DOT rail-highway grade crossing accident prediction models.