Could the MOTers amongst us please clarify what they are for on car tyres. I was of the assumption that they show that when flush the tyre tread is at the minimum and the tyre needs changing. My son has just bought a car from a dealer who put an MOT on it but when I checked it the front two looked well worn. They had tread but not a lot. As it is a front wheel drive (Honda CRV) I decided that it was better to put the rears on the front as that is the main axle for drive, steering etc. and suggested that when his funds allowed he should replace the others. When I started the swap I measured the tyres with my depth gauge and one had a number of the wear indicators flush. The other was not much better. We took it back to the dealer and he sent us to their garage where the car was MOT'd. In their opinion the wear indicators are worthless and as long as the tread was 1.6mm then the tyres were serviceable. My point was that they are called wear indicators for a reason and therefore that warrants that the tyres are worn to limits. My lad is not car nerd and just wants a road legal car which he needs for work as well as he has his first baby on the way and has bought this "safe" Honda to replace his Suzuki Vitara. What do you think. Any advice will be appreciated.