Wolfgang Schwanke writes:

Example: Say there's a restricted airspace whose boundary is parallel
to a big road and very close to it. You just stay on the opposite side
of that road at all times and you're done. Why worry about the exact
position of a boundary?

Because sometimes boundaries are very close together, and you have to
fly between them. You can't just stay twenty miles away from one
without being inside the other.

Such narrow airspace definitions aren't very common. It's possible to
avoid them by planning one's route around the area one feels
uncomfortable with.

Unfortunately, if you plan to go from one urban area to another, you
see a lot of them. And out in the western U.S. at least, it seems
like most of the land is covered by restricted areas or MOAs.

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