DetourBelgium
1. Detour
A detour, also called a diversion, is a temporary alternative route used when the normal road is closed, blocked or unavailable. Detours are commonly introduced during roadworks, accidents, public events, flooding or other disruptions. Drivers should follow the temporary direction signs carefully, reduce speed where necessary and expect unfamiliar roads, changed priorities or additional traffic along the alternative route.
Which signs are used for a detour in Belgium?
Under the current Belgian traffic rules, sign F39 announces an upcoming detour, while sign F41 indicates the direction of the detour route.
Do you have to follow detour signs in Belgium?
Yes. Drivers must obey the applicable traffic signs and authorised directions. When a road is closed and a detour is indicated, drivers should follow the signed alternative route.
How is a detour marked through several intersections in Belgium?
Temporary detour signs can be repeated along the route, especially at direction changes and important or unclear intersections, so drivers can continue following the correct route.

Traffic rules
Belgium