Traveling on a street with the speed limit posted many times at 30 mph and a car comes up behind going very fast (on our street people often 45 mph or more):
a-the red car should slow down to the speed limit, as should the black car
b-the red car should honk the horn and flash its lights while gesturing angrily
c-the black car should slow down to 25 mph and hope that the oncoming traffic keeps up and force the red car to slow down
The black car should slow down to 30, and make faces in the mirror, and talk to them even though they can’t hear and have a good laugh.