right left

THE RULES OF THE ROAD (2 of 5)

The expectation that the other driver will respond to a particular situation in a certain way is so useful that it grows until it becomes generally accepted as a "rule."
cars go right

For example, for some reason, more people prefer to pass on the right than on the left. As time goes by more and more drivers come to expect each other to pass on the right, until the habit is shared by all drivers.