The total roadside border area, starting at the edge of the
traveled way, that
is available for an errant driver to stop or regain control of a
vehicle. This area
might consist of a shoulder, a
recoverable slope, and/or a non-recoverable, traversable slope
with a clear run-out area at its
toe. MUTCD2009 Edition
with May 2012 Revisions 1
and 2
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