The tunnel has just opened today to the public.
It will be in contra-flow for the first 3 days with a 40 MPH speed limit and then the north bound bore will open and it will go to 70 MPH.
There are 217 cameras in the tunnel, and there are also ANPR and avarage speed cameras working inside and outside the tunnel.
Its not best to go flying through this tunnel, but hey, it should speed your times up getting home.
Sam!