Download
transportation research board 2004 annual meeting n.
Skip this Video
Loading SlideShow in 5 Seconds..
Transportation Research Board 2004 Annual Meeting PowerPoint Presentation
Download Presentation
Transportation Research Board 2004 Annual Meeting

Transportation Research Board 2004 Annual Meeting

145 Vues Download Presentation
Télécharger la présentation

Transportation Research Board 2004 Annual Meeting

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Transportation Research Board2004 Annual Meeting Adaptive Signal Control Workshop Session 2: Field Experience January 11, 2004

  2. Orange County SCOOT System By: Hazem El-Assar, P.E.

  3. Presentation Outline • Background Challenges • Potential Solutions • Why SCOOT? • Project Description • Benefits Achieved • Difficulties Faced • Lessons Learned

  4. Background Challenge #1High Traffic Congestion

  5. Background Challenge #2Convention Center Events

  6. Background Challenge #3Convention Center Expansion

  7. OCCC Expansion Facts • 3 million square foot complex: • 2.1 million s.f. of exhibition space • 166,050 s.f. of meeting rooms • 92,000 s.f. of general assembly space • 3,600 parking spaces • Total cost $748 million • Opened November 2003 MULTIPLE EVENTS UP TO 80,000 ATTENDEES EACH

  8. OCCC New Building

  9. Background Challenge #4 Unpredictable Tourist Traffic

  10. Background Challenge #5Closely Spaced Signals

  11. Potential Solutions • Free uncoordinated signals • Officer traffic control • TOD signal coordination • Traffic Responsive Plans • Adaptive Signal Control

  12. SCOOT Adaptive Signal Control plit S C ycle ffset O ptimization O T echnique

  13. Why SCOOT? • Uses real-time upstream flow to adjust timing • Better suited for high volume minor movements • Widely used worldwide since 1981 • Compatible with County’s existing Eagle signal controllers • No need for additional field staff training • More cost effective installation under current conditions

  14. Vehicle Detector Local Controller Central Computer How SCOOT Works

  15. Central Computer • SCOOT server • DEC Alpha running VMS • Operator workstations • PC running Windows • LAN connected via X-Windows emulation • Remote dial-ins via terminal servers • Interface to existing network and workstations using MONARC (now ACTRA)

  16. Communication System • Transmission Media • County-owned fiber optic on arterial streets • FDOT fiber optic on I-4 • Communications Methodology • Single Mode fiber optic • Multi Mode fiber optic

  17. Local Controllers • Existing cabinets • New Eagle EPAC 300 controllers with SCOOT module • Dedicated communication unit • SCOOT detectors

  18. Phase III Phase I Phase II Project Location • General location: • International Drive • Universal Boulevard • Primarily Serving: • Convention Center • Parking Garages • Hotels & Restaurants • Tourist Attractions

  19. Project Schedule • Phase I: May 2000 • 7 New Signals • Phase II: November 2001 • 6 New Signals • Phase III: October 2003 • 4 New Signals • 2 Modified Signals

  20. Project Scope • Replace existing controllers • Install fiber optic communications • Install loop detectors • Provide central hardware and software • Setup and validate the system • Design system maps and intersection graphics • Provide training to County staff

  21. Project Costs • Controller Upgrades $2,500 - $5,000/ intersection • Detectors $10,000-15,000/ intersection • Communications $2,500-$5,000/ intersection • System Configuration, $5,000-$7,500/ Validation, Fine Tuning intersection • Central Hardware/Software $50,000

  22. Operational Benefits Achieved • Convention Center traffic ingress & egress has been cleared efficiently • Overall travel times and delays have been reduced • Officer control of signals is no longer necessary • Regular development and update of timing plans is not necessary • Timing adjustment during long or short term lane closures is not necessary • Real-time traffic data are monitored and archived

  23. Annual Cost Comparison • Detectors +$1,000/intersection • Support Agreement +$34,000 • Central System $0 • Controllers $0 • Communications $0 • Staff $0 • Manual Traffic Control -$450,000 Net Annual Savings ~$400,000

  24. Difficulties Faced • No detectors on short links • Long pedestrian phases • Non-flexible phasing sequence • Low volume traffic conditions • Non-optimal signal progression • Insufficient staff experience • Only remote technical support

  25. Lessons Learned • TOD plans may provide better progression for recurring traffic conditions • Negative impacts may occur in low volume traffic conditions • Pre-determine optimal phasing based on traffic conditions or using other software • Place detectors on all lanes, if possible • Avoid long pedestrian crossings

  26. Thank You! Hazem El-Assar, P.E. Senior Engineer Orange County Traffic Engineering 4200 S John Young Pkwy Orlando, FL 32839 Ph: (407) 836-7866 Fx: (407) 836-7825 E-mail: hazem.el-assar@ocfl.net