Instead of road rage signs.. what about Road conversation signs? A sign that says,
"Are you a robot?"
And when they reply, you follow up with
"Really?"
People on the road expect an asshole, not a fucked up conversation. I'd say instead of pre-printed signs bound on a spiral, it should be some dry-erase sheets with clear protective coverings bound on a spiral. That way, you could formulate entire conversations of your own. and change them if need be.
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