However we also love mini roundabouts which applies what Alabin is saying. (Although most mini roundabouts are treated as plain box junctions anyway by yobos like @Dukeburger818 and @DannyD ).
In america it's just explained in a really specific way. Instead of giving a general rule of thumb like @Alabin we are just explained every possible scenario.
Problem is that there is no ways of adding, removing or ammending laws right now. According to prior posts i've read from a chief if i'm not mistaken. @ayjay ツ