[Tagging] Is a sidewalk always adjacent to a traversable road?

[Anthony]

On Tue, Aug 23, 2011 at 7:38 PM, Nathan Edgars II <neroute2 at gmail.com> wrote:
> http://www.openstreetmap.org/browse/way/67469500 is an extension of a
> sidewalk across a railroad, whereas the adjacent highway does not cross. Is
> it incorrect to use footway=sidewalk here?

Under Florida law [FS 316.003(47)], a sidewalk is always adjacent to a roadway.