Transcript No Slide Title

Transportation Research Board
2004 Annual Meeting
Adaptive Signal Control Workshop
Session 2: Field Experience
January 11, 2004
Orange County SCOOT System
By: Hazem El-Assar, P.E.
Presentation Outline
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Background Challenges
Potential Solutions
Why SCOOT?
Project Description
Benefits Achieved
Difficulties Faced
Lessons Learned
Background Challenge #1
High Traffic Congestion
Background Challenge #2
Convention Center Events
Background Challenge #3
Convention Center Expansion
OCCC Expansion Facts
• 3 million square foot complex:
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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
OCCC New Building
Background Challenge #4
Unpredictable Tourist Traffic
Background Challenge #5
Closely Spaced Signals
Potential Solutions
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Free uncoordinated signals
Officer traffic control
TOD signal coordination
Traffic Responsive Plans
Adaptive Signal Control
SCOOT Adaptive Signal Control
S
C
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T
plit
ycle
ffset
ptimization
echnique
Why SCOOT?
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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
How SCOOT Works
Vehicle Detector
Local Controller
Central Computer
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)
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
Local Controllers
• Existing cabinets
• New Eagle EPAC 300
controllers with
SCOOT module
• Dedicated
communication unit
• SCOOT detectors
Project Location
General location:
• International Drive
• Universal Boulevard
Phase III
Phase I
Primarily Serving:
• Convention Center
• Parking Garages
Phase II
• Hotels & Restaurants
• Tourist Attractions
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
Project Scope
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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
Project Costs
• Controller Upgrades
• Detectors
• Communications
• System Configuration,
Validation, Fine Tuning
$2,500 - $5,000/
intersection
$10,000-15,000/
intersection
$2,500-$5,000/
intersection
$5,000-$7,500/
intersection
• Central Hardware/Software $50,000
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
Annual Cost Comparison
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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
Difficulties Faced
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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
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
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: [email protected]