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ASCT Workshop – Phoenix 2011

ASCT Workshop – Phoenix 2011. 99W Adaptive Signal Implementation Jon Meusch Khang Nguyen. Project Elements. Project Traffic Signals. I-5 NB / 60th Ave I-5 SB / 64th Ave 68th Pkwy / 69th Ave 72nd Ave 74th Ave 78th Ave / Dartmouth St 217 NB 217 SB Hall Blvd Greenburg Rd / Main St.

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ASCT Workshop – Phoenix 2011

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  1. ASCT Workshop – Phoenix 2011 99W Adaptive Signal Implementation Jon Meusch Khang Nguyen

  2. Project Elements Project Traffic Signals I-5 NB / 60th Ave I-5 SB / 64th Ave 68th Pkwy / 69th Ave 72nd Ave 74th Ave 78th Ave / Dartmouth St 217 NB 217 SB Hall Blvd Greenburg Rd / Main St Johnson Rd / Main St Walnut St Garrett St Park St Tigard Shopping Center McDonald St / Gaarde Canterbury Lane Bull Mountain Rd Beef Bend Rd Royalty Parkway Durham Rd

  3. 99W Corridor Characteristics • Congested suburban corridor • 45,000 vehicles per day at the south end • 54,000 vehicles per day at the north end • Built out with numerous accesses • Tri-Met frequent service route • Closely spaced intersections • 21 intersections in a 4.25 mile section • Traffic Signal Timing last updated in 1998 • Signal technology approximately 20-30 years old

  4. Recent Construction Other Projects 2 Signal Modifications 6 FYLTA Additional Lane

  5. Project Goals • Reduce corridor travel times • Reduce delay and queues, particularly on minor movements • Better response to variations in traffic • Improved system monitoring • Advancing the state of signal timing practice in Oregon

  6. Project Elements • Signal Cabinets • Model 2070L Traffic Signal Controllers • NWSVoyage firmware • Modern Signal Communications • TransSuite Communications software

  7. Study and Evaluation Evaluation Tools • Travel time studies using MAC readers • Queue and delay studies using video • Evaluation tools within Voyage

  8. Technology Background • MAC Address: a 48 bit (>28 trillion) unique address assigned to a device by its manufacturer. • Bluetooth: a wireless protocol utilizing short-range communications technology facilitating data transmission over short distances from fixed and/or mobile devices • Bluetooth =

  9. Study and Evaluation Evaluation Stages • Mimic existing technology • Optimize timing plans • Implement advanced features

  10. Preliminary Results

  11. NWSVoyage™ 2070 Application Software • Controlling traffic since 2003 • Sets the industry benchmark for field proven firmware • A powerful and user friendly controller application • “The Standard” in the states of Idaho, Oregon, Washington and Wyoming, the City of Portland and many other jurisdictions • Includes many advanced features, including three proprietary adaptive control algorithms

  12. Actuated Coordination Nearly all intersections Coord Late Left Turn 68th Ave Hall Blvd Greenburg Bull Mountain Beef Bend Dynamic Phase Length Nearly all intersections Dynamic Phase Reversal 74th Ave 78th/Dartmouth McDonald/Gaarde Royalty Parkway Fastway Offset Seeking All intersections Max Plans All Intersections Not Ped Overlap Hall Blvd Greenburg Ped Override Mode All intersections Repeat Phase Service 68th Ave 74th Ave Park St Tigard East Shopping Center Canterbury Lane Beef Bend Rd Variable Max Extension 74th Ave Splits All Intersections Zero Mode SMS at nearly all intersections EMS at Beef Bend Rd Advanced Features Used on 99W

  13. NWS Adaptive Control Approach: • Easy to program • Based on normal controller functionality • Low cost • Easy evaluation of operation and results

  14. Adaptive Control: A Supplement to a Well-Executed Coordination Plan Traffic on Hwy 99W is reasonably predictable as this graph shows. It shows volumes from a main street detector over four consecutive days.

  15. Dynamic Phase Length (DPL)

  16. Dynamic Phase Length (DPL) DPL makes small changes to the length of phases based on REAL TIME traffic demand.

  17. DPL, con’t Det 17 Use advanced detectors to measure volume and occupancy in each lane. Then make small adjustments to the Force Off point of the current phase(s). Det 18

  18. Dynamic Phase Length - ODOT Comments Benefits • Allocates green time to direction that needs it at that time • Utilizes cycle inefficiencies Drawback • Bad detection can give too much time to a particular movement

  19. Dynamic Phase Reversal • An adaptive algorithm that changes the phase order to optimize efficiency. • Based on the fundamental timing principal that the phase with more demand (in a phase pair) should lag.

  20. Dynamic Phase Reversal - normal

  21. Dynamic Phase Reversal - reversed

  22. Dynamic Phase ReversalCycle-by-Cycle Data

  23. Dynamic Phase Reversal – ODOT Comments Benefit • More effective clearing of side street queues Drawback • May violate driver and pedestrian expectancy

  24. NWS Adaptive Control: A Supplement to a Well-Executed Coordination Plan • Easy to program • Based on normal controller functionality • Low cost • Easy evaluation of operation and results

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