The big fookin Transit thing with big stripes on the back and a camera poking out a black window........... that I didnt see till last minute

What kind of range do they get you from????? I was driving about 40 ish in a 30 too busy listening for an engine noise and didnt spot the van till I was fairly close and had slowed down behind an astra van, which pulled out in front of me about 100 meters before the camera van. Im expecting points