[Tagging] what does maxheight=none mean?

Bryce Nesbitt bryce2 at obviously.com
Sun Nov 2 18:14:18 UTC 2014

1) In many jurisdictions the ultimate permit and authority come from a
state sponsored map of restrictions.  For example
http://www.dot.ca.gov/hq/traffops/permits/stars.htm (warning: requires
crufty Microsoft software).

2) Consider that many bridges cross at an angle, meaning there's more
clearance on one side than the other.  A height restriction per lane is
sometimes seen.  Databases like the STARS database above will code more
than the simple maxheight sign which typically provides a pessimistic view
of the clearance.
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