This would solve an issue I have regularily. Sighted people tend to invert left/right almost more then 50% of the time when telling directions to a blind person, especially if they are not looking in the same direction. In fact, the error is so common that I actually gave up listening to directions from random strangers. The likelihood of them being wrong is so high that it actually is dangerous to listen to sighted people without double-checking if they actually can be right.