What it means
The R-306 sign prohibits overtaking for lorries. The prohibition is aimed at the affected lorries, so it must not be confused with a general overtaking ban for all vehicles or with a speed limitation. It is usually placed on gradients, in tunnels, on carriageways with limited visibility, narrow stretches, or places where lorry overtaking may obstruct traffic or increase risk. When you see it, if you drive an affected lorry you must remain in your position until the prohibition ends. In the test they often ask which vehicles it affects and distinguish it from the R-305 general overtaking prohibition sign.
- Category
- Regulatory signs
- Shape
- Circular (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-106
No entry a vehicles destinados al transporte of mercancias
R-107
No entry a vehicles destinados al transporte of mercancias con mayor masa autorizada que la indicada
R-108
No entry a vehicles que transporten dangerous goods
R-109
No entry a vehicles que transporten mercancias explosivas o inflamables
R-110
No entry a vehicles que transporten productos contaminantes del agua
R-111
No entry a vehicles agricolas of motor
R-112
No entry a vehicles of motor con remolque que no sean un semirremolque o un remolque of un solo eje
R-113
No entry a vehicles of traccion animal