3.53 A horizontal curve on a two-lane highway (12-

ft lanes) has PC at station 123 + 80 and PT at station

129 + 60. The central angle is 35 degrees, the

superelevation is 0.08, and 20.6 ft is cleared (for sight

distance) from the inside edge of the innermost lane.

Determine a maximum safe speed (assuming current

design standards) to the nearest 5 mi/h.