Why did they use vertical trade lanes?

[JojKyLizaLe]

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........

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[Skorak]

In which system can you not see the fog lights when jumping in? We can fix that

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[DragonRider]

In older versions the left lane was the entry. Real question is, why did they switch?

[NOVA-5]

Because those horizontal lanes are shite well, laggy.

[Wulthus]

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).