Reviewed 2026-11-03 · F23c
Signs and road markings →International route number

Purpose and student action
Identify the road regime, destination or service. A change of road regime can change the applicable driving rules.
Read · decide · act
- Decide whether the sign identifies a road regime, destination, facility or local name.
- If it starts or ends a road regime, apply that regime’s rules, not just the picture.
- Plan lane changes early; never cross a prohibited line to recover a missed exit.
Source documents
International route number
Coverage refers to this dated source catalogue, not every local sign or all Belgian legislation. Variants and reference examples are counted separately.
Regulatory source ↗Published legal wording (French/Dutch)
F23c. Numéro d'une route internationale.
F23c. Nummer van een internationale weg.