
What it means
The R-108 sign prohibits entry to vehicles carrying dangerous goods. The prohibition depends on the load being carried and the risk it represents, not only on the size of the vehicle or on it being an ordinary goods vehicle. It usually appears in tunnels, through roads, urban areas, sensitive passages, or routes where that transport must avoid the signed access. When you see it, if you drive an affected vehicle you must divert onto a permitted route and not continue for convenience. In the test they often distinguish it from specific prohibitions for explosive, flammable, or water-polluting goods.
- CategoryRegulatory signs
- ShapeCircular (red or blue)
Practise DGT questions featuring this sign
Ten DGT 2026 exam-style questions about signs, with an explanation after each. Free, no signup.
Other related signs

R-413
Dipped headlights

R-414
A carriageway for vehicles carrying dangerous goods

R-415
A carriageway for vehicles carrying products that pollute water

R-416
A carriageway for vehicles carrying explosive or flammable goods

R-417
Mandatory use of the seat belt

R-418
A road exclusively for vehicles fitted with operating electronic toll equipment

R-500
The end of prohibitions

R-505
The end of a reserved road