Bob Noel writes:

An aircraft without DME, LORAN, and GPS may wish to stay out of the Boston
Class Bravo airspace. An excellent way to do that is follow 495 around Boston.
For those that want the torture, I know it can be done with just one VOR.

I see that the 495 is almost north-south (magnetic) in some portions. How do
you manage your altitude when flying that portion of the highway?

A more difficult situation arises when the highway meanders substantially back
and forth from east to west, constantly crossing 360 or 180 degrees. If it's
in hilly country (as it might well be if it has to meander back and forth),
just setting a single heading might not be an option, as you can easily lose
sight of the highway. So, in that case, how does one manage altitude?