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... 1   S U M M A R Y The clear zone concept for roadside design emerged in the mid-1960s as a single distance for lateral clearance that reduced the likelihood of an errant vehicle striking a roadside obstacle. Subsequent recovery area guidance that evolved over the next two decades provided a variable distance expressed in terms of traffic volume, design speed, sideslope, and other roadway and roadside factors.
From page 2...
... 2 Development of Clear Recovery Area Guidelines matrix for vehicle type was developed using vehicle sales data by combining sales percentages for the vehicle makes and models corresponding to the platforms of the simulated vehicles. Encroachment relationships in the form of statistical models were derived in terms of significant roadway and roadside design variables to assist with the determination of the probability and severity of an impact given an encroachment has occurred.

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