Under the Spanish land transport law (LOTT), for road transport subject to that law using a vehicle with an authorised maximum mass above 12 tonnes, at what excess over the authorised maximum total mass does the serious offence in article 141.2 begin, requiring immobilisation when detected during its commission on the road?

Correct answer

From a 10% excess over the authorised maximum total mass.

From a 10% excess over the authorised maximum total mass. For vehicles above 12 tonnes, article 141.2 defines the serious offence from 10% to below 20% total excess; article 143.4 includes immobilisation when detected on the road, except documented circumstances where that measure would create a greater safety danger. This is not a universal threshold concerning the load alone: percentages vary with authorised mass and total or axle excess, and other safety grounds may justify immobilisation. Staying below this threshold does not make overloading lawful.