I ride predawn. One lesson I learned was that puddles like the streams that run along the edge of a street's lane, do not show their depth in the dark. So you might cross a stream of water and be OK because its running over flat pavement or you might cross that stream in another spot where it runs over a pot hole, you can't tell. Water depth is obvious in daylight but not in the dark and lights just make it worse as they reflect off the water.