Most cars these days are way too complicated to change the bulbs without a load of tools and knowledge, but as said above a lot of cars are 100% LED now, so a bulb pack is pointless, a bit like the compulsory breathalysers for tee-totals in France, although they dropped this law in the end. And if you used your breathalyser, then you couldn't drive anyway, as you didn't have a working breathalyser any more!