Originally Posted by Hoopdriver

Is this not the case for all transportation? I know that it applies to boats - USCG rules are pretty simple (I did substitute the term "road user" for "vessel).

[I]Any road user overtaking any other shall keep out of the way of the road user being overtaken. When a road user is in any doubt as to whether he/she is overtaking another, he/she shall assume that this is the case and act accordingly.