speed camera vans

[bodgit]

Do all speed camera vans have to have an open window/hatch to aim the gun through.
I was just leaving the village on my bike going to warp factor 2 with just 50yards to go to national limit when as an oncomming lorry passed me the van became clear. Too late to significantly slow down although the breaklights lit up like afterburners.
I decided to go back and offer my congrats on a snidey place to hide, behind a bush when I noticed the van had no appature for the camera to aim through. Am I lucky or can they photo you through blackened glass
by the way this is what we have to face in North Wales