In the presence of sign R-306 (No overtaking for trucks), is a bus driver permitted to overtake the truck driving ahead?

Question

DentroTest · Accepted Answer

Sign R-306 prohibits trucks with a maximum authorized mass above 3,500 kg from overtaking motor vehicles traveling on the roadway, even when the maneuver does not involve entering the opposite lane (Official Catalog of Traffic Signs, Royal Decree 465/2025; there is no longer an exception for motorcycles). It is aimed at those trucks and does not apply to a bus, whatever its mass, which may overtake the truck following the general overtaking rules. It is not true that it prohibits overtaking in every case: it does not affect buses. And the mass that counts is that of the truck doing the overtaking, not that of the vehicle being overtaken, so limiting overtaking to trucks under 3,500 kg is not valid either.

In the presence of sign R-306 (No overtaking for trucks), is a bus driver permitted to overtake the truck driving ahead?

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