I have seen a car parked on a roof, too when I was in Holland, but it was considered art. But here it took nearly ten years of disorder until the town police was established and then the parking credo "park wild and in the opposition to the rules" gradually subsided to a bearable level. Waiting to get a confiscated car back and paying high fees did the job as well as blue lines and tons of parking meters. So now whole town center is blue-lined. Parking on bicycle lanes is still very popular though, so sometimes biking to a town's center is more like a slalom discipline. Bikers are obviously considered a lower race or some second grade citizens. Heck, we don't live in Holland where the bikers a first grade with bicycle lanes as wide as those for the cars.