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Innovations in Traffic Signal Systems : 

Innovations in Traffic Signal Systems CE 7670: Advanced Traffic Signal Systems Tapan K. Datta, Ph.D., P.E.

What is SCATS?: 

What is SCATS? SCATS = Sydney Coordinated Adaptive Traffic System Originated in Sydney, Australia Used in Europe, Australia, Hong Kong and some areas in the US (Oakland County, Michigan)

How does SCATS work?: 

How does SCATS work? SCATS gathers data on traffic flows in real-time at each intersection. Data is fed via the traffic controller to a central computer. The computer makes incremental adjustments to traffic signal timings based on minute by minute changes in traffic flow at each intersection.

How does SCATS work?: 

How does SCATS work? Detects traffic volume by movement Converts data to flow rate Calculates optimal cycle length Calculates optimal splits by phase Determines phase combinations Checks timing alteration thresholds Sets up implementation

SCATS Architecture: 

SCATS Architecture

SCATS System Architecture Minimal System - Single Region: 

SCATS System Architecture Minimal System - Single Region

SCATS System Architecture SCATS 1 - with Integration Server: 

SCATS System Architecture SCATS 1 - with Integration Server ATMS = Advanced Traffic Management System ATIS = Advanced Traveler Information System ITMS = Integrated Transportation Management System * *

Configuration - SCATS2: 

Configuration - SCATS2

SCATS Sensors: 

SCATS Sensors Controller collects number of spaces and total space time during green of each movement, each cycle for use by SCATS adaptive algorithm. Actual movement data collected by stop line detectors allows accurate split determination.

SCATS Sensors: 

Loop detectors or Video detectors (as used in Oakland County, MI) in most lanes at the stop line. SCATS Sensors

SCATS Controllers: 

SCATS Controllers Existing controllers: NEMA AWA Delta 170 Proposed controllers: SCATS 2070 SCATS 2070N

SCATS Installation Cost Ranges 64 Intersection System : 

SCATS Installation Cost Ranges 64 Intersection System Central Hardware approx. $30K Central Software approx. $40K to $70K Regional Hardware approx $20K Regional Software approx $70K Source: TransCore

SCATS Installation Cost Ranges 64 Intersection System: 

SCATS Installation Cost Ranges 64 Intersection System Local Controllers approx. $3.5K to 5.5K, (Total approx. $300K) Communication Network - Included above Detection Sensors - Standard loop amplifiers and 6 x 15 loops – approx. $230K Total – approx. $650K for single region Source: TransCore

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System: 

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System Central Hardware approx. $3K per year Central Software approx. $4K per year Regional Hardware - negligible Regional Software approx. $8K per year Regional Setup & Support - similar to current support level plus quarter to half man-year per year. Source: TransCore

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System: 

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System Local Controllers - similar to current controllers Communication Network - User owned approx. $22/month Detection Sensors - depends on quality of original installation and road surface Source: TransCore

What is SCOOT?: 

What is SCOOT? SCOOT = Split Cycle Offset Optimization Technique Used in Toronto, Canada; San Diego and Anaheim, California; Arlington, Virginia; London, UK; Bangkok, Thailand; Singapore; and a few other cities.

How does SCOOT work?: 

How does SCOOT work? Similar to SCATS, it obtains information on traffic flow from the detectors SCOOT has 3 optimization procedures: Split, Offset and Cycle Length Unlike SCATS, the detectors are located at the upstream end of the approach link

SCOOT Architecture: 

SCOOT Architecture

Oakland County, Michigan: 

Oakland County, Michigan FAST-TRAC = Faster And Safer Travel Through Routing and Advanced Controls Help optimize traffic flow on existing roads, but cannot completely eliminate congestion.

How does FAST-TRAC work?: 

How does FAST-TRAC work? Digital video cameras (Autoscope cameras) installed at an intersection to detect approaching vehicles and continuously analyze traffic flow The Autoscope device instantly transmits the traffic flow data to a computer stored in a control box located near the intersection The computer sends the data to a regional computer, which automatically adjusts the traffic signal timing to match the traffic flow Can increase green time in one direction by reducing red time at an intersection, if necessary

How does FAST-TRAC work?: 

How does FAST-TRAC work? The regional computer monitors traffic flow of the whole network, and balances traffic flow along major corridors For an accident, the regional computer will adjust area-wide traffic signal timing to accommodate traffic back ups 7 regional computers are connected to a central management computer at the Traffic Operations Center (TOC) of RCOC Traffic engineers at TOC monitor any specific intersection or the whole network

Communities installed with FAST-TRAC: 

Communities installed with FAST-TRAC Auburn Hills Commerce Township Farmington Farmington Hills Hazel Park Madison Heights Milford Novi Orchard Lake Village Pontiac Rochester Hills Southfield South Lyon Troy Walled Lake West Bloomfield Wixom

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