Quote Originally Posted by run it, ride it View Post
When there's a car coming behind and we're not single file we'll yell up the line "car back" and vice versa, yell "car up" down the line if not everyone can see. Sometimes we're more specific, e.g. "BIG FREAKING TRUCK back."
Sometimes on my rides we have "PLANE BACK" because we ride along an airport landing strip. It can be pretty scary to have a Boeing 747 drafting behind you!!!

We also go over a bridge with a "LOW FLYING AIRCRAFT" sign. I love that one.