I came across my first one a couple of weeks back I wasn't sure if my bike would drop though it I was sh* tting it but didn't even think to get off but it was fine but I still wet myself everytime I approach one, aslong as you don't go over them sideways I guess you'll be fine same thing with drains at the side of the road, I've noticed some go the same way as the road so if you hit those your tyre will go inside them