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Innovations in Traffic Signal Systems


SCATS gathers data on traffic flows in real-time at each intersection. ... Hazel Park. Madison Heights. Milford. Novi. Orchard Lake Village. Pontiac. Rochester Hills ... – PowerPoint PPT presentation

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Title: 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?
  • SCATS Sydney Coordinated Adaptive Traffic
  • Originated in Sydney, Australia
  • Used in Europe, Australia, Hong Kong and some
    areas in the US (Oakland County, Michigan)

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?
  • 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 System ArchitectureMinimal System - Single
SCATS System ArchitectureSCATS 1 - with
Integration Server

ATMS Advanced Traffic Management System ATIS
Advanced Traveler Information System ITMS
Integrated Transportation Management System

Configuration - SCATS2
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

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

SCATS Installation Cost Ranges 64 Intersection
  • 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
  • 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
  • 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

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

Source TransCore
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

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
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?
  • 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

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
  • 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