Japan has a couple of unique automotive regulations. For example, every other year cars have to undergo an extensive inspection to make sure they’re being properly maintained and haven’t been illegally modified (although you can get away with some pretty interesting modifications in the 24 months between checks). You have to make a full stop at all railroad crossings, regardless of whether or not there’s a train coming.
For new drivers, there’s even an additional rule, which states that for their first year on the road, they have to put a large sticker on their car advising surrounding motorists to be extra careful. But while the law states the vehicle must bear two stickers, one on the front and one on the rear, there’s apparently no upper limit, as one proud owner recently demonstrated.