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Consolidation Commission - Transportation Sub-Committee. City of Orlando Signalization Presentation September 8, 2005. Traffic Signal Operation. Signal Mounting System Signal Heads Detectors Signal Controller Interconnect Link to Other Signals - PowerPoint PPT Presentation
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Consolidation Commission - Transportation Sub-Committee
City of OrlandoSignalization Presentation
September 8, 2005
Traffic Signal Operation
• Signal Mounting System• Signal Heads• Detectors• Signal Controller• Interconnect Link to Other Signals• Communications/Control Link to Traffic
Management Center (TMC)• Traffic Management Center
Signals Overview
• FDOT – No operations– Provide funding for state road maintenance– Approve phasing and signal modifications– Timing set by local agency
• City – All City signals
• County– All County signals– Maintenance agreements with some small cities
• Private – Control Specialists– Ocoee, Winter Springs, Oakland, Winter Park,
Maitland
ORLANDO SIGNAL SYSTEM
• 470 Devices
• 416 Signals
• 14 Cameras
• Traffic Management Center (TMC)
Communication Interconnect
• 21 Miles of Fiber Optic Cable
• 50 Miles of Twisted Pair
• 16 Locations connected via Radio
GENERAL STRATEGIES
•
Improve reliability of loops
•
Real time dataAerial Detectors
PresenceSpeedsStationary & MovingLength of Queues
DOWNTOWN
ChallengesGrowthLack of DetectorsLymmoRailroad Tracks & Trains
DOWNTOWN SYSTEM100 Signals
• Interactive Grid
• Communications withTraffic Management Center (TMC)
• Programmed Timing Plans
Downtown Growth
• Employment – 56,000 to 75,000
• Residential Units – 3,000 to 7,000
Lack of Detectors
Timing plans by time of dayAM PeakMid-dayPM PeakEvening & Nights
• Shorter cycle lengths• More Green time on Main street• Flash selected locations
Lymmo
Preemption throws off timing
Railroad Tracks & Trains
Trains interrupt timing
DOWNTOWN SOLUTIONS
• Adaptive System• Manual Intervention from TMC• Special Event Management• Dynamic Signs• AM Radio Advisories• Cameras• Add Detection Loops and/or Video
Detection
MAJOR CORRIDORS(City – County – FDOT)
Major Corridor Total - 114 Signals
– Kirkman– JYP– Hiawassee Road– OBT– Orange – Magnolia– Mills
– Bumby– Maguire/Crystal Lake– Edgewater– Vineland– Conway– Semoran Boulevard– Narcoossee
North-South
MAJOR CORRIDORS (City – County – FDOT)
East-West– Princeton– Virginia/Corrine– Colonial– Robinson/Washington– Central Boulevard– South/Anderson/Lake Underhill– Gore– Kaley– Michigan– Lee Vista Boulevard– Curry Ford
MAJOR CORRIDORS APPROACHRoadway Hierarchy
• Primary roads– Determines master cycle length– Determine green time allocation– Primary road example is: SR 436 (Semoran Boulevard)
• Secondary Roads– Curry Ford
• Tertiary Roads– Conway
• Local Access Roads
MAJOR CORRIDOR STRATEGIES
• Connected to TMC
• Redundant communications
• All loop & video detectors in rush hour– Main street green gets majority of green
– Left turn minimum setting or skip if not present
– Override for left turn
– Side street queue override
• Some crossing streets problems – drag racing, speeding
MINOR SYSTEMS202 Signals
• Within Major Developments
• Short segments/Small clusters
• Individual Isolated Signals at Access Points
MINOR SYSTEMS STRATEGIES
• Protect main street green
• City/County approval of timing plans
• Retime on an “At least every 3 years cycle”
• Improve staff training
• Reduce reliance on consultant’s support for timing
• Reduce retiming cycle to annually
REALITIES OF SIGNAL SYSTEM OPERATION
Capacity• Near capacity – Variable performance• Exceed capacity – unpredictable performance
• Peak Capacity conditions• Overall Capacity Deficiencies
– Frequent failures to clear intersection– Frequent intersection blockage– Frequent pressing of red at both crossing movements
• SIGNAL COORDINATION IS LOST• Non-Signal Options are very expensive
Other Realities
• Pedestrian – push buttons at intersections• Schools
– Pedestrian crossings – students– Parent cars queue– School buses
• Fire Stations with Preemptive controls• Construction
– Cut loops & communications lines
Coordination Agreements
• Current agreement includes 12 intersections– 6 City of Orlando– 6 Orange County
• Coordination responsibility given to other agency
• Equipment Maintenance remains with original agency
City – County Coordination
• Official Committees– Central Florida ITS Consortium– Metroplan M & O Subcommittee– District 5 Maintaining Agencies Group
• Informal (Staff to Staff)– Transportation Manager to Manager– Senior Engineer to Signal Systems Engineer
Emerging Standards for Hardware
• National Transportation Communications for ITS Protocol (NTCIP)– Federally mandated– Not finalized
• Hardware is functionally compatible, but software is incompatible between City and County
• Staff is not trained to work on other systems
FUTURE ACTION
• Review Specific Locations
• Review Overall System
• Review Communication Links for Other Opportunities