In a highway, any car can enter and is flexible to switch lanes and the coordination between cars is mostly a responsibility of the drivers. In the railway everything is pre-routed and no surprises are technically possible — dispatchers and planners have more control than the train driver and there is no room for flexibility — you just stay in your rails. What is air like? Can I build my own plane and just join the air traffic without telling anyone?
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It’s like this. Click this, click the button top right marked “World Hi” this shows the airways. There are high altitude airways and low altitude airways. They are also layered at 1000 feet intervals.
https://skyvector.com
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