Overview
ISO 10711:2012 - Intelligent Transport Systems - defines the interface protocol and message set between traffic signal controllers and traffic detectors. The standard specifies message sets for real‑time traffic signal control and is limited to parameter generation and logical message definitions (not physical wiring or lower‑layer encoding). It standardizes how detectors report data to controllers so diverse detector technologies can interoperate with traffic signal control systems.
Key topics and technical requirements
- Three detector message sets: occupancy‑based, image‑processing‑based, and vehicle‑identification‑based detectors.
- Occupancy: reports presence/occupancy and optionally speed (e.g., loop, magnetic, ultrasonic).
- Image: reports virtual detection‑zone results, queue length and minimal camera control commands.
- Vehicle identification: reports individual vehicle IDs (e.g., license plate, tag, OBU, barcode).
- Message structure: frames contain detector controller information followed by per‑detector data fields (physical detector index, detection type, detection information, optional time/location).
- Operational modes: supports event‑driven, request‑response and periodic data exchange methods.
- Detector identification: requires unique detector indices; traffic controllers should support cross‑reference tables to map local detector IDs to globally unique IDs within the signal operation.
- Scope limits: excludes interfaces between sensors and their own detector controllers, controller‑to‑centre interfaces, pass‑through controllers, and raw analog signal cases.
- Protocol layering: ISO 10711 defines logical message sets; encoding rules and transport layers are left to other standards or national profiles (see Related Standards).
- Supplementary material: Annex A defines data structures and types; Annex B provides an implementation example.
Applications and who uses it
ISO 10711:2012 is used by:
- Traffic engineers and municipal ITS planners specifying interoperable signal systems.
- System integrators and software developers implementing traffic signal controller interfaces.
- Detector manufacturers (loops, cameras, RFID/OBU systems) ensuring devices are controller‑compatible.
- Procurement teams who require vendor‑neutral interface requirements for traffic control projects.
Practical benefits:
- Faster integration of new detector types without controller software changes.
- Consistent, compact data exchange that reduces communication load (useful for short‑range wireless links).
- Improved interoperability across manufacturers and technologies.
Related standards
- ISO 15784‑3:2008 (AP‑DATEX application profile for roadside modules)
- ISO 14827‑2:2005 (DATEX‑ASN transport/data interface)
- Developed by ISO/TC 204 - Intelligent transport systems
Keywords: ISO 10711:2012, Intelligent Transport Systems, traffic signal controllers, traffic detectors, interface protocol, message set, occupancy detector, image processing detector, vehicle identification.