Overview
EN ISO 14823-1:2024 / ISO 14823-1:2024 specifies a Graphic Data Dictionary (GDD) for intelligent transport systems (ITS). The GDD defines a standardized, language‑independent coding system for existing road traffic signs and pictograms used to deliver traffic and traveller information (TTI). Adopted by CEN as EN ISO 14823-1:2024, this first edition revision supersedes ISO 14823:2017 and improves global identification, flexibility and backward compatibility for ITS messaging and in-vehicle signage.
Key topics and technical requirements
- Scope and conformance: Rules for implementing the GDD and achieving compliance with the standard.
- Structure of pictogram codes: Detailed code format including category, nature and serial identification; support for relative object identifiers (OID) (Clause 7.3) and country code handling.
- Numbering ranges: Predefined pictogram ranges for major types (e.g., danger/warning, regulatory, informative, public facilities, ambient/road conditions, supplementary panels) outlined in Clause 8.
- Data modeling & serialization: ASN.1 descriptions of the GDD are provided (Annex A - version 2; Annex E - version 1) and associated attribute sets (Annex B/F). UML diagrams and specializations are included to assist implementers (Annex C/G/D).
- Attributes and flexibility: New/updated attributes to support multiple pictogram variants; ability to include up to four pictograms per dictionary entry. Deprecated codes were removed and new country requests added.
- Interoperability notes: Designed to be language‑independent to support consistent decoding and display across jurisdictions and to assist translation between different national sign representations.
Applications
- In‑vehicle information systems and head‑unit displays for showing standardized signs and pictograms.
- Traffic management centres and TTI providers for encoding sign-based messages in ITS communications.
- Map and navigation providers to translate or localize sign representations between countries.
- Road authorities and sign designers for harmonized sign identification and exchange.
- OEMs and embedded systems vendors using ASN.1/OID implementations to integrate GDD into on‑board systems.
Who should use it
- ITS developers, telematics suppliers, automotive OEM software teams, traffic control agencies, digital map providers, national standards bodies and integrators working on cross-border TTI services.
Related standards and notes
- Supersedes ISO 14823:2017; part of the ISO 14823 series.
- References country codes historically from ISO 3166-1 (background).
- Annex I lists existing national signs included in the GDD; Annexes provide machine-readable schemas and examples to accelerate implementation.
Keywords: intelligent transport systems, graphic data dictionary, GDD, ISO 14823-1:2024, pictogram codes, ITS messaging, in-vehicle signage, ASN.1, object identifier, traffic signs.
