American Association of State Highway and Transportation Officials. “Roadside Design Guide, 4th Edition.”American Association of State Highway and Transportation Officials, Washington D.C.: AASHTO's Roadside Design Guide presents a synthesis of current information and operating practices related to roadside safety and focuses on safety treatments that can minimize the likelihood of serious injuries when a motorist leaves the roadway. Clear Zone and Horizontal Clearance. What is the definition of clear zone? The Roadside Design Guide defines a clear zone as the total roadside border area, starting at the edge of the traveled way, available for safe use by errant hfkdocs.com area may consist of a shoulder, a recoverable slope, a non-recoverable slope, and/or a clear run-out area.
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