1 the technology side of the sydney coordinated adaptive traffic system (scats) presented by: betsy...
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The Technology Side of the Sydney Coordinated Adaptive
Traffic System (SCATS)
Presented by:Betsy Williams
TransCore
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SCATS Background
The Roads and Traffic Authority of New South Wales (RTA)
• Developer and primary user of SCATS Continued innovation through user group
involvement Extensive user base
• Effective, mature, practical system Worldwide - over 21,000 intersections under
SCATS control in 71 installations
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Shenyang
Tianjin Shanghai, NingboSuzhou HangzhouGuangzhou
Hong KongManilaCebu
Kuala LumpurSerembanSingapore
BruneiSandakan
JakartaBandung
Detroit
DelawareDurham
Cobb Co
Suva Fiji
Shijuazhuang
TehranMashhad
Dublin
Auckland Wellington Christchurch + 11 cities
Darwin
Perth Adelaide Sydney Melbourne & many other cities
Mexico CityToluca
SCATS Worldwide System Installations
YichangYichangDoha
Chula VistaPasco Co.
Concepcion
GreshamPark CityMenlo ParkSunnyvale
Waterford
IsraelYanbu
Dacca HanoiPattaya Vietianne
Rzeszow
Pietermaritzburg
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SCATS US Installations
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Benefits of SCATS
Reduces need/effort for updating signal timing
Accommodates traffic fluctuations Allow special functions to be installed for
event centers Assist maintenance of signals via monitoring
features Collect volume counts for planning purposes
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Typical Adaptive vs. TOD Graph
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SCATS Objectives
Select cycle length, splits and offsets to achieve
• Minimum stops with light demand
• Minimum delay with normal demand
• Maximum throughput with heavy demand
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SCATS Detection
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SCATS Detection Requirements
YES
• Stop bar
NO
• Advanced
• Upstream
• Downstream
• Mid-block
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SCATS Detector Requirements
Presence detection
Optimal strategic SCATS detectors are 6 ft x 15 ft located at the stop line for all lanes
Detectors can be longer or shorter if needed, however shorter is better than longer
Local actuation detectors may be used at minor intersections and can be varying in size
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Typical Detector Layout
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• SCATS operates by looking at “space” between vehicles
• Eliminates vehicle length from equation
• Graph is linear with no double curves
LoopSpace Time (secs)
SCATS Detectors
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SCATS Equipment
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SCATS Controllers
SCATS uses 2070 controllers• 2070 Lite – no VME backplane• Eagle and Econolite 2070s• 2070N – reuse of existing cabinets
Eagle M-50 series 170 E controllers
• SafeTran or McCain controllers
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Hardware Requirements
Server Requirements• Minimum 400 MHz Intel processor – 128M RAM• Windows NT or 2000
Laptop and Workstation Requirements• Minimum 400 MHz Intel processor – 128M RAM• Windows NT, XP or 2000
Dial-in access• 56K modem
• VPN access
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Communications
Leased line, twisted pair copper, fiber optic, spread spectrum radio
300 bps per controller
Point-to-point communication
Point-to-multipoint communication
Ethernet/IP communications
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SCATS Operation
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SCATS Modes
Adaptive Mode Traffic adaptive coordination mode
Time-of-Day Mode Fixed-time coordination fallback mode
Free Mode Vehicle actuated operation
Master Free Mode Vehicle actuated with SCATS calculated splits
Flash
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SCATS GUI
Familiar Windows interface• Pull down menus
Real-time information
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Active Time-Space Monitor
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Reports
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For additional information contact:
Betsy Williams TransCore
(770) [email protected]
or
Travis White TransCore
(801) [email protected]
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Proven Performance
Chula Vista, CA• Travel Time Reduced By Up To 15%• Travel Speed Increased By Up To 18%• Delay Reduced By Up To 43%
Menlo Park, CA• Stops Reduced By Up To 24%• Travel Time Reduced By Up To 28%• Delay Reduced By Up To 44%
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Proven Performance
Road Commission For Oakland County, Michigan• Corridor Travel-Time Reduction Range 6.56% To
31.8%• Average Travel-Time Improvement 7.8% For Peak
Traffic During Peak Periods
Broward County, Florida• Stops Reduced By Up To 28%• Travel Time Reduced By Up To 20%• Delay Reduced By Up To 42%
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• Automatically calculated to try to maintain Degree of Saturation between 80% and 90% on the lane with the highest DS
• Lower and upper limits are user definable (20 secs to 190 secs)
• Can vary by up to 21 seconds per cycle – usually only 2 to 5 seconds
SCATS Functions - CYCLE LENGTH
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• Varied automatically by up to 4% each cycle.
• Tries to maintain equal Degree of Saturation on competing approaches.
• Minimums are user definable.
• Maximums are limited by cycle length and minimum requirements of other phases.
SCATS Functions - SPLITS
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SS 1
SS 2 SS 3
SYSTEM
• Intersections can "marry" or "divorce " with each other
• Married intersections operate on a common cycle length (and offset plan)
• Intersections marry:
• when their CL's are within 10 sec or
• when one-way volume exceeds a configured threshold or
• when a “forced” / continuous “marriage” is required
SCATS Functions - Linking
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• The best offsets are selected for the high flow movements.
• Preset offset plans automatically vary to compensate for varying cycle lengths.
• Directional bias based on measured flows.
SCATS Functions – OFFSETS
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Intersection Display
Currently activated detectors shown blue.
Shown red if faulty
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Alarm Display
All operator actions and alarms can be sorted, filtered and printed