The self leveling works on all roads. If youve 2 big heifers in the back which would lift the lights up then the self leveling will put the lights down. If it hadn't self leveling they would stay up. The headlight washers make a big difference as a dirty light causes the light to go everywhere hence why headlight washers can be an mot fail.The self levelling only works on flat, perfectly smooth roads, so not on real roads. The glare from the intensely lit "exit pupil" of the LED housing is pretty bad, too. The headlight washers don't seem to make much difference, either, or drivers don't use them often enough.