In general, the outer edge is raised above the inner edge in horizontal curves for

Highways, Railways, and Taxiways
Highways and Railways only
Railways and Taxiways only
Highways only

Correct answer: Highways, Railways, and Taxiways

Solution

The outer edge is raised on horizontal curves to provide superelevation, which helps counteract centrifugal effects. This is used in highways, railways, and taxiways.

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