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As previously stated, first and foremost separate the light / low speed traffic (ecars, bikes) from heavy traffic (current automobiles & trucks) with much more emphasis on the light'nlow side of things having efficient paths and full access.
When stops are required, elevate them whenever economically feasible so that they require almost no braking, and then allow gravity acceleration back to speed.
Progressively lower speed limits on ascents to apexes. 60 > 55 > 50 > 45
Likewise progressively increase speed limits on the other side.
As for Arminius' tree comment, I think wind breaks tend to help. You never gain as much back from a tailwind as you lose from the same headwind, so I must admit I like wind breaks where possible.
All tolls, customs, booths etc. designed on mild downward slopes.
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