Reviewed 2026-11-03 · F23b
Signs and road markings →Motorway 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
Motorway 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)
F23b. Numéro d'une autoroute.
F23b. Nummer van een autosnelweg.