signal patterns for improving light rail operation
DESCRIPTION
Signal Patterns for Improving Light Rail Operation. Wintana Miller, Associate Transportation Engineer With Mark Madden, P.E., P.T.O.E. DKS Associates. Signal Patterns for Improving Light Rail Operation. Transportation in Tacoma Initial Pilot Project Update to Project Signal Timing - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/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
![Page 2: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/2.jpg)
Transportation in Tacoma Initial Pilot Project Update to Project Signal Timing
What’s Next
Signal Patterns for Improving Light Rail Operation
![Page 3: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/3.jpg)
Transportation in Tacoma
![Page 4: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/4.jpg)
Downtown Tacoma
![Page 5: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/5.jpg)
Tacoma Link Light Rail
![Page 6: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/6.jpg)
Initial Pilot Project
![Page 7: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/7.jpg)
Parties Involved Problems Found Methodology Challenges
Initial Pilot Project
![Page 8: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/8.jpg)
City of Tacoma Sound Transit Pierce Transit DKS Associates – Technical
Advisers
Parties Involved
![Page 9: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/9.jpg)
Periodic Gridlock Train Headways: 10 minutes (600 seconds) Signal Cycle Length: 70 seconds
Potential Solution: Coordinate Train and Signal Operation
Problems Found
![Page 10: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/10.jpg)
Main Objectives: Compatible cycles = repetitive
operation Same time base = predictable action
across systems Predictable train travel times
Coordinating Train and Signal Operations
![Page 11: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/11.jpg)
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
![Page 12: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/12.jpg)
Time Space Diagram
![Page 13: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/13.jpg)
External Logic Allowed for One Timing Plan
Conservative dwell times Unable to use check out detectors No event plans or seasonal variations
Remaining Challenges
![Page 14: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/14.jpg)
City of Tacoma in the process of upgrading signal system
New signal system has been selected Fine tuning LRT operations
Signal System Upgrades?
![Page 15: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/15.jpg)
Project Update
![Page 16: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/16.jpg)
New Plan Needed New Light Rail Parameters New Traffic Signal Parameters Unique Phasing for Preempts
New Signal Pattern Development
![Page 17: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/17.jpg)
Driven by New Station Construction New Station in Place Before New Controllers
Need for New Plans
![Page 18: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/18.jpg)
Train Headways Train Travel Times Station Dwell Times
New Light Rail Parameters
![Page 19: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/19.jpg)
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
![Page 20: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/20.jpg)
Unique Phasing for Preempts
![Page 21: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/21.jpg)
Normally two phases Train preempt activate left turn phase Avoiding the left turn trap
Commerce St Phasing
![Page 22: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/22.jpg)
![Page 23: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/23.jpg)
![Page 24: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/24.jpg)
Support 120 second cycle length Shorter dwell times during off-peak hours Longer dwell times for special events
What’s Next?
![Page 25: Signal Patterns for Improving Light Rail Operation](https://reader031.vdocument.in/reader031/viewer/2022020417/568142ea550346895daf44d6/html5/thumbnails/25.jpg)
Thank You