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The term "clear zone" is used to describe the generally flat and unobstructed area
that is provided beyond the travel lanes. The clear zone may include shoulders.
For urban streets, arterials, collectors and local streets, where curbs are used,
available area for clear zones may be limited. A minimum offset distance of 18 inches
(450 mm) should be provided between the face of curb and obstructions such as utility
poles, lighting poles and fire hydrants (Local Urban Streets, Horizontal Clearance
to Obstructions, Chapter 5 of AASHTO's, "A Policy On Geometric Design of Highways
and Streets, 2001"). Greater offsets should be provided when possible to permit curbside
parking.
Because most curbs do not have a capability to redirect vehicles, the minimum clear
zone distance should be increased as directed by the Engineer or designated representative
commensurate with increases in traffic volumes and vehicle speeds.
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