(Solved): a stop controlled intersection exists just beyond a horizontal curve with a sight obstruction and in ...

a stop controlled intersection exists just beyond a horizontal curve with a sight obstruction and insuffiecient stopping sight distance is provided in advance of the stop sign. as a result, it has been decided to place a stop ahead warning sign (shown below) in advance of the intersection to warn drivers of the need to stop. the 85th percentile speed on the approach is 63 mph. assuming flat approach grades, calculate the advance placement distance (to the nearest foot) upstream of the intersection for posting of this stop ahead sign. must subtract the legibility distance