signal patterns for improving light rail operation wintana miller, associate transportation engineer...
TRANSCRIPT
![Page 1: Signal Patterns for Improving Light Rail Operation Wintana Miller, Associate Transportation Engineer With Mark Madden, P.E., P.T.O.E. DKS Associates](https://reader038.vdocument.in/reader038/viewer/2022102814/5518a4cf550346a61f8b4a06/html5/thumbnails/1.jpg)
Signal Patterns for Improving Light Rail Operation
Wintana Miller, Associate Transportation EngineerWith Mark Madden, P.E., P.T.O.E.DKS Associates
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Transportation in Tacoma Initial Pilot Project Update to Project Signal Timing
What’s Next
Signal Patterns for Improving Light Rail Operation
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Transportation in Tacoma
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Downtown Tacoma
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Tacoma Link Light Rail
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Initial Pilot Project
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Parties Involved Problems Found Methodology Challenges
Initial Pilot Project
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City of Tacoma Sound Transit Pierce Transit DKS Associates – Technical
Advisers
Parties Involved
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Periodic Gridlock Train Headways: 10 minutes (600 seconds) Signal Cycle Length: 70 seconds
Potential Solution: Coordinate Train and Signal Operation
Problems Found
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Main Objectives: Compatible cycles = repetitive
operation Same time base = predictable action
across systems Predictable train travel times
Coordinating Train and Signal Operations
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Picking a Compatible Cycle Length 100 second cycle
Synchronized Clocks US Official Time: Atomic Clock in
Colorado Springs Sound Transit Train Data
Set Train Schedule
Project Method
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Time Space Diagram
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External Logic Allowed for One Timing Plan
Conservative dwell times Unable to use check out detectors No event plans or seasonal variations
Remaining Challenges
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City of Tacoma in the process of upgrading signal system
New signal system has been selected Fine tuning LRT operations
Signal System Upgrades?
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Project Update
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New Plan Needed New Light Rail Parameters New Traffic Signal Parameters Unique Phasing for Preempts
New Signal Pattern Development
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Driven by New Station Construction New Station in Place Before New Controllers
Need for New Plans
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Train Headways Train Travel Times Station Dwell Times
New Light Rail Parameters
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New Headway New Cycle Lengths 90 seconds
New Pedestrian Timing (per 2009 MUTCD) Decreased walking speed from 4.0 ft/sec to 3.5
ft/sec
New Traffic Signal Parameters
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Unique Phasing for Preempts
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Normally two phases Train preempt activate left turn phase Avoiding the left turn trap
Commerce St Phasing
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Support 120 second cycle length Shorter dwell times during off-peak hours Longer dwell times for special events
What’s Next?
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Thank You