Advance Detection On High Speed Signalized Intersection Approaches

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Advance Detection On High Speed Signalized Intersection Approaches

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Author : Patrick T. McCoy
language : en
Publisher:
Release Date : 2002

Advance Detection On High Speed Signalized Intersection Approaches written by Patrick T. McCoy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Electronic traffic controls categories.

In Service Evaluation Of A Detection Control System For High Speed Signalized Intersections

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Author : Karl Zimmerman
language : en
Publisher:
Release Date : 2005

In Service Evaluation Of A Detection Control System For High Speed Signalized Intersections written by Karl Zimmerman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Electronic traffic controls categories.

Traffic engineers are often faced with operational and safety challenges at rural, high-speed signalized intersections. Vehicle-actuated control, combined with multiple advance detectors, is often used to improve operations and safety. However, this type of detection and control has not always resulted in a significant number of crashes. Crashes sometimes continue to occur at high-speed intersections, and delays to traffic movements can be unnecessarily long. An innovative detection-control system was developed for the Texas Department of Transportation to minimize both delay and crash frequency at rural intersections. This system was subsequently implemented at several intersections in Texas and its safety and operational benefits were evaluated. This report documents the findings and conclusions reached as a result of a three-year implementation project. The Detection-Control System was installed at each of eight intersections in Texas during the three-year period. Five of the intersections were suitable for a before-after study of safety and operational data. An evaluation of the before-after data indicated that the Detection-Control System was able to reduce delay by 14 percent, stop frequency by 9 percent, red-light violations by 58 percent, heavy-vehicle red-light violations by 80 percent, and severe crash frequency by 39 percent.

Accident Countermeasures At High Speed Signalized Intersections

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Author : Ronald W. Eck
language : en
Publisher:
Release Date : 1984

Accident Countermeasures At High Speed Signalized Intersections written by Ronald W. Eck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Roads categories.

Advance warning including flashing signs and strobe lights. Survey of traffic engineers at state and local agencies.

Evaluation Of Detection And Signing Systems For High Speed Signalized Intersections

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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 1996

Evaluation Of Detection And Signing Systems For High Speed Signalized Intersections written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Electronic traffic controls categories.

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 Detector Placement For High Speed Approaches To Signalized Intersections

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Author : Dan R. Middleton
language : en
Publisher:
Release Date : 1997

Evaluation Of Detector Placement For High Speed Approaches To Signalized Intersections written by Dan R. Middleton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Detectors categories.

Evaluation Of Advance Warning Signals On High Speed Signalized Intersections

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Author : Peter T. Martin
language : en
Publisher:
Release Date : 2003

Evaluation Of Advance Warning Signals On High Speed Signalized Intersections written by Peter T. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic traffic controls categories.

Advance Detection At High Speed Signalized Intersections

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Author : Matthew L. Kruse
language : en
Publisher:
Release Date : 2001

Advance Detection At High Speed Signalized Intersections written by Matthew L. Kruse and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Intelligent Detection Control System For Rural Signalized Intersections

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Author :
language : en
Publisher:
Release Date : 2002

Intelligent Detection Control System For Rural Signalized Intersections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Detectors categories.

Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections

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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 2001

Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Electronic traffic controls categories.

A feasibility study of dilemma zone problems, performed by collecting and analyzing traffic flow data at a high-speed signalized intersection, showed that the maximum green extension or cutback needed to get a vehicle out of the dilemma zone is generally no more than 2 seconds. If we scan all vehicles on a link just a few seconds before the beginning of a yellow interval, we may be able to extend or cut back the green interval so that the vehicles can avoid the dilemma zone. For each vehicle approaching an intersection on the link that is about to turn yellow, there is a time interval such that (a) the vehicle will be in the dilemma zone without green extension (or cutback) or (b) it will be in the dilemma zone when there are T seconds of extension (or cutback). So the task is to find the smallest nonnegative integer T that is not in any of these time intervals and extend (or cut back) the current interval by T seconds. This T can always be found and assuming there are no other restrictions, dilemma zones can be avoided and the extension (or cutback) is done at most once for each green interval. The simulation study, performed by modifying the source codes of NETSIM, showed that the signal timing generated by a bandwidth maximization program (PASSER-II) resulted in a lower number of vehicles in the dilemma zone than that generated by a delay minimization program (TRANSYT-7F). Additionally, the signal timing generated by the combination of the two programs, that is, by minimizing delay within the constraint of bandwidth maximization, resulted in an even lower number of vehicles in the dilemma zone than those generated by each program alone. The technique developed in this study can be implemented if the speeds and positions of all vehicles on the roadway can be recorded at small time intervals (e.g., 1 sec). Recommendations are made for implementing and testing the developed technique.

Guidelines For Detector Placement On High Speed Approaches To Signalized Intersections

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Author :
language : en
Publisher:
Release Date : 1997

Guidelines For Detector Placement On High Speed Approaches To Signalized Intersections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Detectors categories.

The primary objective of this research was to validate the new TxDOT procedures for loop detector placement on high-speed approaches to signalized intersections. The study approach involved conducting a field study at selected sites to compare the proposed new loop configuration to the existing configuration. The data analysis included investigating approach speeds to the intersection, driver actions in response to a yellow indication, and vehicle location at the onset of yellow. The Results from the field study revealed that the new loop configuration is as good as, and in some cases better than the old loop configuration. Because the new loop configuration can detect vehicles further upstream from the intersection (at the beginning of the dilemma zone), it results in fewer vehicles being caught in the dilemma zone at the onset of yellow. Also, because the new loop configuration typically resulted in more vehicles running the yellow light instead of stopping, fewer rear-end accidents may result. In addition, the new loop configuration resulted in fewer vehicles running the red light, also a major cause of accidents.