Overview
ISO 15075:2003 - Transport information and control systems - In-vehicle navigation systems - Communications message set requirements - defines the message content and format used by in-vehicle navigation systems. The standard focuses on the messages required to generate or enhance routing instructions, with special emphasis on messages not typically included in general traffic-management lists. It covers both Locally Determined Route Guidance (LDRG) (on-vehicle routing using local map databases) and Centrally Determined Route Guidance (CDRG) (routing computed off‑vehicle), as well as value‑added messages (parking, tolls, emergencies, ridesharing).
Key topics and technical requirements
- Message categories: messages for LDRG (local routing), CDRG (central routing), and value‑added services.
- Structured message sets: ISO 15075 provides tabulated message definitions (content, data fields, formats and field sizes) so navigation systems and infrastructure share consistent semantics.
- Standard location references: standardized methods for referencing points, links and areas to enable unambiguous geolocation in messages.
- Traffic and travel data types: dynamic link travel times, congestion levels, travel time deltas, and repeated time-segment reporting (e.g., 5‑minute intervals).
- Probe and beacon messages: vehicle probe reports, beacon-to-beacon travel times, position reports from roadside beacons (RS), and transaction/temporary ID assignment between vehicle and infrastructure.
- Operational messages: requests and reports for origin/destination, trip completion, current vehicle position, parking and park‑and‑ride information, transit/transportation schedules, and advisory (safety/weather) messages.
- Supporting fields: message codes, timestamps, sequence numbers, vehicle IDs, data format codes, and optional GPS differential correction references.
- Interoperability focus: guides how Traffic Message Centres (TMC), roadside devices, telematics services and in‑vehicle systems exchange routing and operational data.
Applications
ISO 15075 is used to:
- Ensure interoperable communication between TMCs, roadside beacons and in-vehicle navigation units.
- Enable on‑board route calculation and enhancement with real‑time traffic and parking data.
- Support centralized route computation and push of step‑by‑step instructions to vehicles.
- Collect and transmit vehicle probe data for traffic monitoring and analytics.
- Deliver value‑added services such as toll/payment info, transit coordination, emergency alerts and ridesharing messages.
Who uses this standard
- Automotive OEMs and telematics system designers
- Navigation software and map database vendors
- Traffic Message Centres (TMC) and ITS operators
- Roadside equipment and beacon manufacturers
- Fleet management and mobility service providers
- Standards bodies and integrators working on ITS interoperability
Related standards
- Work on location referencing in CEN/TC 278 and ISO/TC 204 (referenced in ISO 15075)
- ISO/TC 204 (Intelligent Transport Systems) publications and GPS interface efforts referenced for positioning and correction data
Keywords: ISO 15075:2003, in‑vehicle navigation systems, communications message set requirements, LDRG, CDRG, traffic message centre, standard location reference, vehicle probe data, roadside beacon, ITS.