Coordinated pre-preemption of traffic signals to enhance railroad grade crossing safety in urban areas and estimation of train impacts to arterial travel time delay.

Lin, Pei-Sung; Wang, Zhenyu; Wang, Qing; Guo, Rui; Sunkari, Srinivasa; Songchitruksa, Praprut; Chen, Xunawu; Xiao, Yan; Hadi, Mohammed; University of South Florida. Center for Urban Transportation Research; Texas A&M Transportation Institute; Lehman Center for Transportation Research

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Coordinated pre-preemption of traffic signals to enhance railroad grade crossing safety in urban areas and estimation of train impacts to arterial travel time delay.

2014-01-01
By Lin, Pei-Sung ; Wang, Zhenyu ; Wang, Qing ; ...

[PDF-4.99 MB]

English

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Creators:

Lin, Pei-Sung ; Wang, Zhenyu ; Wang, Qing ; Guo, Rui ; Sunkari, Srinivasa ; ... More +

Lin, Pei-Sung ; Wang, Zhenyu ; Wang, Qing ; Guo, Rui ; Sunkari, Srinivasa ; Songchitruksa, Praprut ; Chen, Xunawu ; Xiao, Yan ; Hadi, Mohammed Less -
Corporate Creators:

University of South Florida. Center for Urban Transportation Research ; Texas A&M Transportation Institute ; Lehman Center for Transportation Research

University of South Florida. Center for Urban Transportation Research ; Texas A&M Transportation Institute ; Lehman Center for Transportation Research Less -
Subject/TRT Terms:

[+]

Algorithms Arterial Highways At Grade Intersections Before And After Studies Highway Safety Railroad Grade Crossings Simulation Traffic Signal Control Systems Traffic Signal Preemption Travel Time Urban Areas
Publication/ Report Number:

BDK85 977-44
Resource Type:

Tech Report
Geographical Coverage:

Florida
Corporate Publisher:

Florida. Dept. of Transportation
Abstract:

This research project investigated the potential for using advanced features of traffic signal system software platforms

(ATMS.now), prevalent in Florida, to alleviate safety and mobility problems at highway-railroad at-grade crossings and

adjacent arterials. Pre-preemption phasing was developed in this study to provide “extra” green time to the movements

blocked by a train before the train’s arrival at the crossing in order to (1) mitigate congestion on the arterials near

railways and (2) reduce the conflicts of train-vehicle and/or vehicle-vehicle adjacent to at-grade crossings. This study

explored the technologies for implementing key functions of a pre-preemption system, including train detection, train

arrival prediction, and pre-preemption control algorithms, and the capabilities of ATMS.now system. VISSIM-based

simulation models were developed in this study based on three control sections along two railway corridors (FEC and

CSX) in Broward County, Florida, to test the proposed pre-preemption strategies. A series of comparisons before-after

implementing pre-preemption strategies was conducted to validate the effectiveness of pre-preemption strategies. The

major findings and recommendations for implementation from this study are provided below.

 Upstream preemption signals (activation or release) are suggested for triggering pre-preemptions at downstream

intersections along the railroad corridor. The Estimated Time of Arrival (ETA) is predicted based on the logs of two

or more preemptions at upstream crossings with ideal space less than 0.5 miles.

 The coordinated pre-preemption strategy developed in this study aims to clear the through traffic at several

intersections along an arterial as much as possible before train’s arrival. All pre-preemption phases are pre-timed;

coordinated pre-preemption is easy to be implemented on existing traffic controllers.

 Based on the simulation results, the coordinated pre-preemption strategy can effectively reduce average delay,

average stops, and average queue length of the arterials near a railroad crossing. The performance pattern is

sensitive to site features and strategy configurations. Considering its applicability and corridor-level effectiveness,

coordinated pre-preemption is suggested when through traffic volume is higher than 500 vehicles per hour per lane

(vphpl) and train block duration is longer than 100 seconds.

 A generic pre-preemption plan was developed in this study to provide guidance on implementation of the prepreemption strategy using the ATMS.now system in Florida.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:621568bdeae0ad1848b822816dea8355f51e5f01a44d0c795ff02ef5547e6263
Download URL:

https://rosap.ntl.bts.gov/view/dot/26860/dot_26860_DS1.pdf
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Coordinated pre-preemption of traffic signals to enhance railroad grade crossing safety in urban areas and estimation of train impacts to arterial travel time delay.

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