Repeated flashing of headlight/hi-beams, horn, goosing the throttle... whatever is appropriate for the moment of need. I've used each: headlights/hi-beams as I approach an intersection to the highway and it looks like Johnny Cage driver is going to try to make it across before I get there; horn in a parking lot as a truck was backing up towards me; and "goosing" the throttle to let cagers know I'm there at stoplights, etc so I don't have to hear the aforementioned "sorry, didn't see ya"... escape clause!
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