Traffic Signal Standards

History Chaos NEMA (TS 1) 170 (CALTRANS / NY) 170E i NEMA TS ATC 2070N Memory Plug-in Others... Electromechanical In the beginning…..

Slide #3 Traffic Controllers Timeline 1940s s 1992 TS-2 NTCIP Electro- mechanical NEMA TS NEMA TS ATC s

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 Data Element Message Set Standards Data Element Standards Protocol Standards Data Element ITS Standards Data Element Communications

Slide #14 National ITS Architecture Remote Access Subsystems Remote Traveler Support Vehicle Subsystems Center Subsystems Emissions Management Traffic Management Emergency Management Transit Management Toll Administration Freight & Fleet Management Commercial Vehicle Admin Information Service Provider Wide Area Mobile Archived Data Management Roadside Subsystems Roadway Parking Management Commercial Vehicle Check Vehicle Toll Collection Transit Emergency Commercial Personal Information Access Maintenance & Construction Fixed Communications Maintenance & Construction Short Range Wireless Vehicle to Vehicle

Slide #15 Where do Traffic Signal Standards fit? Remote Access Subsystems Remote Traveler Support Vehicle Subsystems Center Subsystems Emissions Management Traffic Management Emergency Management Transit Management Toll Administration Freight & Fleet Management Commercial Vehicle Admin Information Service Provider Wide Area Mobile Archived Data Management Roadside Subsystems Parking Management Commercial Vehicle Check Vehicle Toll Collection Transit Emergency Commercial Personal Information Access Maintenance & Construction Vehicle to Vehicle Actuated Signal Controller Standards Roadway Fixed Communications Short Range Wireless

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   NTCIP Guide, Case Studies, Library   Standards list, details, fact sheets  Standards Development Organizations     FHWA NTCIP