Practice

A rural arterial on a 1,500-ft-radius curve has a design speed of 60 mph and a design-year volume of 6,000 veh/day. For that speed-and-volume cell the agency's clear-zone table (adapted from the Roadside Design Guide) gives 30 ft where the roadside is a fill foreslope of 1V:6H or flatter, 36 ft where it is a fill foreslope of 1V:5H to 1V:4H, and 26 ft where it is a backslope in cut. The agency's curve-adjustment factor for this curve's radius and design speed is $K_{cz}=1.3$. On the outside of the curve the roadside is a 1V:6H fill foreslope running down to a ditch. The section is drawn schematically (not to scale). The clear-zone distance to be provided on the outside of the curve is most nearly:

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