ISO 26684-2015 PDF

Full title and description

Intelligent transport systems (ITS) — Cooperative intersection signal information and violation warning systems (CIWS) — Performance requirements and test procedures. This International Standard defines the concept of operation, functional and performance requirements, information content and test methods for CIWS deployed at signalized intersections to help reduce crash risk and improve intersection safety.

Abstract

ISO 26684:2015 specifies CIWS (Cooperative Intersection Signal Information and Violation Warning Systems) including system classification, the concept of operation, functional requirements for roadside equipment (RSE) and on-board equipment (OBE), performance requirements, the information contents required for V2I/I2V exchange, and test procedures/methods to verify conformance. The standard is focused on application-level requirements and test methods; it does not mandate specific communications technologies or driver behavioural models.

General information

• Status: Published (International Standard).
• Publication date: 2015-05 (May 2015).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 03.220.01; 35.240.60 (Intelligent transport systems / Traffic control systems).
• Edition / version: Edition 1 (2015).
• Number of pages: 12 pages in the ISO publication (note: some national/adopted versions or publisher formats show different pagination — e.g., a British adoption listing shows 24 pages).

Scope

ISO 26684:2015 covers the standardization of CIWS functions at signalized intersections: definition of system classes and configurations, functional behaviour (CIWS states and transitions), required information elements exchanged between RSE and OBE, performance targets for warning activation, and test procedures to verify system performance. The standard explicitly excludes specifying the communication technology (physical and link layers) and excludes modelling driver behavioural responses or all possible vehicle capability combinations.

Key topics and requirements

• Concept of operation for CIWS: objectives, system configuration and roles of RSE and OBE.
• Classification of CIWS (system classes and configurations) and state diagrams describing CIWS operation.
• Functional requirements for OBE and RSE including acquisition of vehicle position, travel direction, and signal phase/timing information.
• Performance requirements and criteria for warning activation and deactivation to reduce intersection crash risk.
• Information content requirements (SPaT/MAP-like information elements and timing data) and recommended message contents for CIWS use.
• Test procedures and methods to verify functional behaviour and performance of CIWS implementations.
• Notes on out-of-scope items: communication layer specifications, driver behaviour modelling, and exhaustive vehicle capability permutations.

Typical use and users

CIWS designers and integrators, traffic signal manufacturers, roadside equipment vendors (RSU/RSE providers), vehicle OEMs and Tier‑1 suppliers developing on‑board warning systems, traffic engineering consultancies, test laboratories performing CIWS conformance testing, and road authorities responsible for deploying cooperative ITS at signalized intersections. The standard is used to define requirements for system procurement, interoperability design and laboratory/field testing.

Related standards

Relevant ITS and message/communications standards commonly used alongside ISO 26684 include ISO/TS 19091 (V2I/I2V messages for signalized intersections — evolved technical specification), CALM/ITS station architecture standards (ISO 21217 and related CALM standards), SAE J2735 (V2X message set including SPaT/MAP), and regional specifications such as NEMA TS and NTCIP profiles that define traffic controller / RSU interactions. These related standards cover message formats, communications architectures and regional practice that complement the CIWS functional and test requirements in ISO 26684.

Keywords

CIWS; cooperative intersection signal information; violation warning; ITS; V2I; RSE; OBE; SPaT; MAP; test procedures; performance requirements; traffic signal; ISO 26684:2015.

FAQ

Q: What is this standard?

A: ISO 26684:2015 is an International Standard that specifies concept of operation, functional and performance requirements, information contents and test procedures for Cooperative Intersection Signal Information and Violation Warning Systems (CIWS) at signalized intersections.

Q: What does it cover?

A: It covers CIWS system classification, CIWS state diagrams and transition criteria, functional requirements for RSE and OBE (e.g., position and direction acquisition), the information elements required for warnings, performance targets for activation/deactivation of warnings, and test methods to verify conformance. It does not prescribe specific communications technologies or driver behavioural models.

Q: Who typically uses it?

A: Traffic authorities, ITS integrators, roadside equipment and vehicle manufacturers, test labs, and consultants involved in the specification, procurement, deployment and testing of cooperative intersection safety systems.

Q: Is it current or superseded?

A: ISO 26684 was published in May 2015 (first edition). According to ISO metadata the document is published and subject to the standard ISO periodic review process; confirm current status with your national standards body or ISO web catalogue before procurement or certification. National/adopted versions may show different pagination or editorial formatting.

Q: Is it part of a series?

A: It belongs to the family of ITS standards developed under ISO/TC 204 and is intended to be used together with related ITS messaging and communications standards (for example ISO/TS 19091 for intersection messaging, ISO CALM/ITS architecture standards and message-set standards such as SAE J2735) to achieve interoperable V2I/I2V CIWS deployments.

Q: What are the key keywords?

A: CIWS, cooperative intersection, SPaT, MAP, RSE, OBE, V2I, performance requirements, test procedures, intelligent transport systems.