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access zone, <of a road tunnel>
part of the open road immediately outside (in front of) the entrance portal, covering the distance over which an approaching driver must be able to see into a road tunnel
Note 1 to entry: The access zone begins at the stopping distance point ahead of the entrance portal and it ends at the entrance portal.
Note 2 to entry: This entry was numbered 17-8 in CIE S 017:2011.