I can back-up all of this info too, using these roads myself every day.
The Gatso on the A48 at Langstone hasn't been recommissioned since the road was resurfaced last summer, but as DB says, they do seem to be placing a Scamera Van in the lay-by on t'other side of the road more often of late.
I actually saw a horse stood on the pavement, right opposite The Highway Robbery, sorry, Gulf Fuel Station, this Friday, at 7:30 am... being a 'Paint' I'd hazard a guess it belonged to one of our Romany 'friends' from the Emerald Isle - can't imagine hitting one on a bike tho... ewww (horse of Gypsie)!