It is an interesting racket where you have to take your car in for an inspection every year. They put a sticker on your windshield with the month hole-punched out. The sticker is color coded for the year so cops can easily see if you have a sticker that is more than a year out of date. If they set up a checkpoint for drunk driving on new year's or something they always look for that as well and they occasionally set up checkpoints to look specifically for it. The inspection is done completely with a computer (in addition to checking whether your lights work) so it basically gives business to people who've invested in an inspection machine and the manufacturers of inspection machines. I'm not at all convinced that it improves either the safety of the cars or reduces pollution.