SCATS Adaptive Traffic SystemTRB Adaptive Traffic Control Workshop

January 2000Session 2 - Equipment Requirements

For further information contact: Neil R. Gross

Neil.Gross@transcore.com

2

SCATS Architecture

CentralManagement

System

RegionalComputer

RegionalComputer

RegionalComputer

RegionalComputer

RegionalComputer

ManagementFunctions

StrategicTrafficControl

Traffic Controllers -Tactical Traffic Control

1 to 32

up to 250 perRegional Computer

3

SCATS System ArchitectureMinimal System - Single Region

RegionalComputer

SCATS TrafficControllers

Up to 250 perRegional Computer Point-to-Point or Multidrop

connected Traffic Controllers

Dial-inWorkstation(s)

OperatorWorkstations - serial

or LAN connected

4

SCATS System ArchitectureSCATS 1 - with Integration Server

DEC VAXSCATS Management Computer

SCATS LANDatalink

OperatorWorkstations

SCATS Interface Server

ExternalLAN

Ramp MeteringControllers

Up to 32 Regional Computers

Mixed Connection

Remote RegionalComputer(s)

Local RegionalComputers

SCATS TrafficControllers

Up to 128 perRegionalComputer

Point-to-Pointconnected Traffic

Controllers

Multidrop connected Traffic Controllers

Dial-inWorkstation(s)

RegionalATMS,ATIS

Services,ITMS

5

Configuration - SCATS2

DatalinkSCATS ManagementComputer

SCATS LAN

OperatorWorkstations

Ramp MeteringControllers

Up to 32 Regional Computers

Mixed Connection

Remote RegionalComputer(s)

Local RegionalComputers

SCATS TrafficControllers

Up to 250 perRegionalComputer

Point-to-Pointconnected Traffic

Controllers

Multidrop connected Traffic Controllers

Dial-inWorkstation(s)

Regional ATMS,ATIS Services,

ITMS

6

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.

7

SCATS Sensors • Loop Detectors or

equivalent (video detection in Oakland County MI) in most lanes at the stop line.

• Some lanes can be left without detectors.

8

Communications - SCATS1

CMS(Central

managementComputer)

OperatorWorkstations

Other ITSSystems

LAN orRAS/PPP

Controllers

300 Bps Point-to-Point (Bell 103)

or1200/2400 BpsMultidrop (V22/

V22bis)

LAN-TCP/IPor FD Data

line

Delta 3NSCATS 170

LAN/WAN

TCP/IP

RegionalComputers

9

Communications - SCATS2CMS

(CentralmanagementComputers)

OperatorWorkstations

Other ITSSystems

LAN orRAS/PPP

SCATS Protocol(TCP/IP-PPP-V34)

orNTCIP Standard

Global Objects (plusselected special

MIB)

RegionalComputers

LAN-TCP/IPor FD Data

line

NTCIPCenter -to

CenterNTCIP

Class B

Other TrafficDevices (e.g.

Signs)

SCATS 170SCATS 2070

SCATS 2070NUS NTCIP

Controllers

LAN/WAN

10

SCATS Traffic Controllers -Existing

• AWA Delta 170 upgrades existing 170 controller to support SCATS.

• Relay Module added for sense/control of cabinet status.

• AWA Delta 3N controller replaces existing NEMA controller.

• Connections are via existing A, B and C connectors.

• One back-panel link required.

170 NEMA

11

SCATS Traffic Controllers -Planned

• SCATS 2070

• SCATS 2070N

12

SCATS Hardware Requirements• Management Computer - Database and Mgt Systems

– SCATS 1 DEC VAX/ALPHA, OpenVMS

– SCATS 2 Networked PCs

• Regional Computer - Strategic Control– Personal Computer with Windows NT

– Digi Serial Interface system.

13

SCATS Hardware Requirements

• Operator Workstations - Up to 15– Personal Computer with Windows NT or Windows 98

• SCATS Controllers - Tactical Control– up to 250 per Regional Computer

14

SCATS Installation Cost Ranges 64 Intersection System

• Central Hardware approx. $ 30,000 (small VAX)• Central Software approx. $40K to $70K

• Regional Hardware approx $20K• Regional Software approx $70K

15

SCATS Installation Cost Ranges 64 Intersection System

• Local Controllers approx. $3.5K to 5.5K, total say $300K

• Communication Network - Included above• Detection Sensors …. Standard loop amplifiers

and 6 x 15 loops…..$230K?• Total - approx $650K for single Regional (No

CMS)

16

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System

• Central Hardware approx $3K per annum• Central Software approx $4K per annum• Regional Hardware - negligible.• Regional Software approx $8Kpa• Regional Setup & Support - similar to current

support level plus quarter to half man year per annum.

17

SCATS Operations & Maintenance Cost Ranges - 64 Intersection System

• Local Controllers - similar to current controllers• Communication Network - User owned TWP? or

VG Leased Line approx $22/month• Detection Sensors …loop maintenance? Depends

on quality of original installation and road surface...

End

Thank You