In which type of vehicles is it generally mandatory for the tire tread depth to be at least 1.6 millimeters?

Question

DentroTest · Accepted Answer

Spanish regulations (General Vehicle Regulations) state that tires must present, throughout their use on public roads, a depth in the main grooves of the tread of at least 1.6 mm. This obligation applies specifically to: Category M1 vehicles: Motor vehicles designed and constructed primarily for the transport of persons and their luggage (passenger cars). Light goods vehicles (N1) and light trailers. In contrast, heavy vehicles (such as trucks over 3,500 kg) and large trailers are not subject to the exact 1.6 mm measurement; the law only requires that they have 'visible tread pattern' and that the cords are not exposed. Therefore, among the options, the 1.6 mm rule is associated with vehicles destined for passenger transport and light vehicles, not heavy cargo vehicles.

In which type of vehicles is it generally mandatory for the tire tread depth to be at least 1.6 millimeters?

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