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Non-Vital Advance Rail Preemption of Signalized Intersections Near Highway-Rail Grade Crossings: Technical Report.
| 题名： | Non-Vital Advance Rail Preemption of Signalized Intersections Near Highway-Rail Grade Crossings: Technical Report. |
| 作者： | ruback, l. g. balke, k. engelbrecht, r. |
| 关键词： | pedestrians, clearance, railroad tracks |
| 摘要： | The Texas Department of Transportation (TxDOT) primarily uses simultaneous preemption of traffic signals near highway-rail grade crossings to clear queued vehicles prior to the arrival of a train at the crossing. At some intersections, 20 seconds of advanced warning may not be sufficient to allow the traffic signal to clear pedestrians using the normal clearance intervals between phases. The research developed an alternative method (non-vital advance preemption) of ensuring adequate pedestrian clearance in the presence of an approaching train without interfering with the normal preemption sequence at the intersection or installing costly additional track circuitry needed to provide advance preemption. Two strategies were investigated to ensure pedestrian clearance time. The first utilizes a lower-level preemption sequence to guarantee full pedestrian clearance to a terminating phase before the traffic signal starts the preemption sequence. The second strategy uses the pedestrian-omit feature to prevent the controller from activating the pedestrian interval if there is not sufficient time in advance of the start of the preemption sequence to provide full pedestrian clearance. / NOTE: Technical rept. (Sept. 2003 - Aug. 2006). / Supplementary Notes: See also PB2008-100138. Prepared in cooperation with Texas Univ. at Austin. Center for Transportation Research. Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0801；122p |
| 报告类型： | 科技报告 |
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