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Clear Zone
The AASHTO Roadside Design Guide defines a clear zone as the total roadside boarder area, starting at the edge of the traveled way, available for safe use by errant vehicles. This area may consist of a shoulder, a recoverable slope, a non-recoverable slope, and/or a clear run-out area.
The desired width is dependent upon the traffic volumes and speeds and roadside geometry. As an example, a roadway with 400 vehicles per day, a posted speed limit of 55 MPH and 4:1 (H:V) side slopes would have a calculated clear zone of 23 feet, per figure 3.1b; Roadside Design Guide.
The RSG cautions, the distances obtained from figure 3.1b and associated table suggests only the approximate center of a range to be considered and not a precise distance to be held as absolute.
Clear Zone BP and Sample Policy (link to PDF)
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