Alarge grain elevator is located 40 feet from the centerline fo a two-lane highway (55 mph speed limit, 12 ft lanes). the elevator is situated on the inside of a horizontal curve with a radius of 500 feet, measured to the cneter of the innermost lane, assuming that the elevator is the only sight restriction on the curve, what is the minimum sight distance along the curve (measured to the center of the inside lane)? Does adequate stopping sight distance exist? in not, what action should be taken?