Pretty much what I thought too. Flashing headlights meant either you didn't have your headlights on or a cop is ahead.
Another thing I heard is when a semi is passing and clear to get over in your lane, flash your headlights so he knows. It must be true because I have done that and the drivers have flashed their rig lights back at me.
Last edited by Sheri; 03/06/0902:26 PM. Reason: added comment
"An ignorant man thinks he knows everything, a wise man knows he doesn't."