Flashing: Yes or No?

[Sioso]

After going past a speed trap do you flash oncoming vehicles?
(I'm talking about headlights).

I had a few dozen vehicles come past yesterday prior to going past a speed camera set up on the side of the road (a side street out in the middle of nowhere - 60 zone) not a single car gave me a warning.

I was sitting on the speed limit anyway so no problem there, but it does appear to be happening less and less.

I figure if they are going to go to the trouble of hiding I'll go to the trouble of letting others know, especially when the spot they choose isn't dangerous but is suspiciously close to a change in speed limits.