Traffic Signal Standards

History

Chaos

NEMA (TS 1)

170 (CALTRANS / NY)170E 179

470i

NEMA TS 2

2070

ATC

2070N

Memory Plug-in Others . . .

Electromechanical

In the beginning…..

Slide #3

Traffic Controllers Timeline

CM Uor

MM U

1940s 1976 1980s 1992

CM Uor

MM U

TS-2NTCIP

Electro-mechanical

NEMATS-1 170

NEMATS-2

2070ATC

1998 1990s

Slide #4

Electro-Mechanical Controllers

No standards in use No software needed Still exists, New York City,

Chicago, … ( New York has over 11,000)

Slide #5

NEMA TS 1 & TS 2 Controllers

Functional specification Includes vendor-dependent hardware & software Shelf mounted TS 1 standard pin-outs for A, B & C, but not D TS 2 provides for serial connection to cabinet Proprietary solutions for signal timing Wide variety of cabinet configurations

Slide #6

Type 170 & 179 Controllers

Hardware specification Software is provided by others Rack mounted with

standard modules Standard front panel Originally developed

by public sector Very low cost – QPL

approach Utilized older technology

Slide #7

Advanced Transportation Controllers

The ATC is attempting to bring these two competing standards together while preserving the best of both.

170 NEMA

ATC

Slide #8

ATC Program Goals

Interchangeability between manufacturers Assured source of competitively priced controllers Better adaptability to advances in technology Cost effective and modular construction Minimize the level of hardware detail Ensure interoperability within systems Provide well defined controller testing

requirements

Slide #9

ATC Program Goals (continued)

Open architecture Hardware and software platform Support for multiple ITS applications

Recoverable software investment Software portability between vendors / technology Enhanced availability of software applications

Flexible hardware platform Better adaptation to new technology Promotes expandability for power users

“Traffic control PC”

Slide #10

Potential ATC Applications

Traffic Signal Traffic Surveillance Transit Communications Field Master Ramp Meter Variable/Dynamic

Message Sign

General ITS Beacons CCTV Cameras Roadway Weather

Information Weigh in Motion Irrigation Control Lane Use Signals

Slide #11

The ATC Family of Standards

Controller Unit – 2070-ATC and the ATC Cabinet System Application Programming Interface (API) Application Software

Slide #12

NTCIP

National Transportation Communications for ITS Protocol (NTCIP) Device level data dictionaries Communications protocols for transmission

Based on existing standards Internet Protocols International Standards Organization (ISO) Open-

Systems Interconnection (OSI) layers Data element definition uses ASN.1 language

Slide #13

Message

DataDataElementElement

DataDataElementElement

Message Set Standards

Data Element Standards

Protocol Standards

DataDataElementElement

ITS

Stan

dard

s

DataDataElementElement

Communications

Slide #14

National ITS Architecture

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Emergency

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icle

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Slide #15

Where do Traffic Signal Standards fit?

Remote AccessSubsystems

Rem

ote

Trav

eler

Sup

port

VehicleSubsystems

Center Subsystems

Em

issi

ons

Man

agem

ent

Traf

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anag

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Em

erge

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Tran

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Frei

ght &

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et M

anag

emen

t

Com

mer

cial

Veh

icle

Adm

in

Info

rmat

ion

Ser

vice

Pro

vide

r

Wide Area Mobile

Arc

hive

d D

ata

Man

agem

ent

Roadside Subsystems

Parking Management

Commercial Vehicle Check

Vehicle

Toll CollectionTransit

Emergency

Commercial

Per

sona

l Inf

orm

atio

nA

cces

s

Mai

nten

ance

& C

onst

ruct

ion

Maintenance & Construction

Veh

icle

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ehic

leActuated

Signal ControllerStandards

Roadway

Fixed Communications

Sho

rt R

ange

Wire

less

Slide #16

NTCIP Traffic Signal Standard

NTCIP defines communications standards applicable to traffic signal controllers

Users define controller specifications Users define system operational characteristics

Slide #17

List of Required Traffic Signal Standards

Dictionaries NTCIP 1201 – Global Object Definitions NTCIP 1202 – Actuated Signal Controller

Protocols NTCIP 2301 – AP-Simple Transportation Management

Framework (STMF) Profile NTCIP 2101 / 2102 – Subnet Profiles NTCIP 2201 / 2202 – Transport Profiles

Slide #18

Bringing Things Together

In general, NTCIP Uses modular standards Covers multiple devices Devices will need multiple compatible standards

Simply specifying “NTCIP-Compliant” is not enough…..

Slide #19

Web Resources

www.ntcip.org NTCIP Guide, Case Studies, Library

http://www.standards.its.dot.gov/standards.htm Standards list, details, fact sheets

Standards Development Organizations www.ite.org www.ite.org/standards/atc/ www.nema.org www.aashto.org

FHWA

NTCIP