As long as cars are gracefully handling weird visions (like Stop sign in middle of 80mph highway) it should be fine.<p>When I was 1yo my dad was driving on the highway, got distracted, and ended up on a highway portion that was under construction. He was driving full speed, when he saw a barrier, late enough that he swung the steering wheel to avoid the barrier, and ended up driving on 2 wheels before the car felt back and stopped. No baby at the time, my grand-ma was holding me in the back (good old years when cars were lighter and less secure).<p>Random things can happen on the road, including wrong signage. As long as the car can assess the current state and graceful transition to a safe spot, it should be fine to throw at them random signage.