Am I right in thinking that they are only active when they are stationary?

What devices detect these?

 

yes

a good pair of eyes

usually, by the time you see em, if your speeding, your fukked

BUT if you do get caught, contest it as they are not very reliable and give the wrong readings a lot of the time

 

I don't think anything detects these as the just film you over a set distance.

No radar/laser AFAIK

Could be wrong though!

 

ANPR vehicles do operate mobile and stationary.

 

do they have to be clearly marked???

i see them all the time with no markings and no signs out

 

So, are you saying that the Yellow vans could potentially get you if you pass them on a Dual Carriageway going 20mph faster than they are, for example?

 

No..If they are being driven down the road, they are not in operation.

They have top be stationary to guage your speed..

 

Now who would edit that?


If you did, that would be worth framing the picture and speed printed on it

 

ANPR - Automatic Number Plate Recognition

Not Speed Camera vans which I assume we're discussing

 

I didn't assume - I just answered "Camera Vans" as the thread title suggested.

But if your specifically on about speed cameras then a speed check could be done via VASCAR if it is working in the van - and that can be done on the move

 

I was on the A12 in Essex a few months ago and shot past one at 3figure speeds, the fucker wasnt pleased, flashed his lights and gestured and all sorts.

 

No front number plate "avoids" them.... .