The law doesn't apply to cars (or anything less than 3.5t), although the gov't have asked DVLA conduct a survey to see if it would be beneficial to apply it to cars as well. Considering it took years for this to apply to trucks, and currently only the front axle, I imagine it'll take a year or 3 before it happens.My M.O.T tester was telling me about it 2 weeks ago and its deffo coming in for car tyres if they are around 7 plus years old. Not sure when exactly he said but it is.