Yeah, it's great to come out of a nebula and trying to figure which lane is green. At home in Gallia, it's way less confusing and the way to go! And get bent with your America bashing........
In real world aviation, traffic is separated by altitude.
for instance, in VFR flights, rule exists where westbound flights have to use cruising altitudes with even number (eg. 4500 feet), and eastbound with odd (eg. 3500feet).