ISO 21219-15:2023

Overview

ISO 21219-15:2023 - Intelligent transport systems - Traffic and travel information (TTI) via transport protocol experts group, generation 2 (TPEG2) - Part 15: Traffic event compact (TPEG2-TEC) specifies the TPEG2 Traffic Event Compact (TEC) application for exchanging concise, prioritized traffic-event messages. TEC is designed to convey events such as roadworks, traffic jams and local hazard warnings (e.g., black ice, obstacles, accidents) to support safety-critical and real-time traffic and travel information services.

Key topics and technical requirements

The standard defines the structure, semantics and encoding needed for interoperable TPEG2 TEC messages. Major technical topics include:

• Application constraints and signalling: rules for application identification, version signalling, ordered components and extensions to ensure consistent interpretation.
• TEC message structure: definitions of top-level components (e.g., TECMessage, MMCSwitch, MessageManagement) and event models.
• Event modelling: attributes for Event (effect, cause, start/stop time, length affected, speed attributes, rounding rules, at-grade junction closures).
• Location models: ProblemLocation, RestrictionLocation, SegmentLocation to precisely locate incidents and restrictions.
• Cause and advice coding: Cause, DirectCause, LinkedCause, Advice elements with rules and constraints.
• Traffic measures: VehicleRestriction, DiversionRoute, TemporarySpeedLimit and detailed handling for diversions and temporary limits.
• Datatypes and tables: standard datatypes (LaneNumber, RestrictionType, SegmentModifier, etc.) and code tables (effect codes, cause codes, warning levels, vehicle types, diversion types).
• Encodings and examples: normative annexes for TPEG-Binary and TPEG-ML representations and informative coding examples for implementers.

Practical applications and users

ISO 21219-15:2023 enables consistent delivery of compact traffic-event messages for a variety of ITS applications:

• Navigation & route-planning systems - automatically calculate alternative routes and avoid delays.
• In-vehicle infotainment and driver-assistance - present high-priority hazard warnings to enhance travel safety.
• Traffic data providers and broadcasters - encode and distribute standard TPEG2-TEC messages across networks.
• Traffic management centres and road operators - share event information (closures, roadworks, infrastructure failures) across systems.
• Mobile apps and fleet management - integrate concise, interoperable traffic event feeds for real-time operational decisions.

Related standards

• Part of the TPEG2 family and the ISO 21219 series (TPEG TTI standards). Implementers should align with other TPEG2 parts and national/regional ITS regulations when integrating TEC messages.

Keywords: ISO 21219-15:2023, TPEG2-TEC, traffic event compact, intelligent transport systems, TTI, traffic and travel information, hazard warnings, route planning, navigation systems, traffic data providers.