The maximum effective range of a speed camera van is about as far as you can throw a slightly out-of-shape cat. It’s not omnipotent. It’s not magic. It’s a controversial piece of tech operated by a human who is probably just as bored as you are.
Your best defense is simple: obey the speed limit. Or, if you must speed, do it on a road so twisty and hilly that no van could ever get a clean line of sight. Find a road with trees, bends, and short sightlines. But honestly, just slow down. The van can only catch you if you let it, usually within 300 meters, and usually while you’re panicking and forgetting to breathe. Now, go drive like a normal person, or at least like someone who doesn’t want to fund a councilman’s next holiday to Benidorm.