Speed camera confusion please help

[z3ster]

I was travelling along a 50mph stretch of dual carriageway this afternoon that I had not been along for a while.

Suddenly came around a bend and was faced with a front facing speed cameram, Truvelo?, I believe.

I jumped on the brakes, as you do but don't know whether I was caught. What was strange was that there where lines on the road after the camera as you get with a gatso. There was also a series of maybe 2 or 3 very narrow lines before the camera. Never seen this before.

I was below 50mph before I hit the first white lines and obviously well below 45mph by the time I hit the lines after the camera.

My questions are:-

1)Do truvelos flash if they get you?

2)If not at what point are they likely to get you? before you get to the first lot of lines or as you get to them?

3)What are the lines after the camera for?

Any help would be useful as up to now I have a clean licence and hopefully still have one.

Thanks.

[z3ster]

Thanks for the replies and the link.

I see how they work now.

Hopefully then I was below 50mph at about 6.5ft before the white lines.

Cheers