I've noticed some people have tagged bridges with height=*, rather than tagging
the road way under the bridge as maxheight=* and I'm kind of unsure which is
better.
By using height you don't have to break the way under the bridge up, on the
other hand maxheight is specific to the road under the bridge.
That all said I think height was a predecessor tag to ele and then again I've
seen trees tagged with a height too.
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