Horizontal Sight Distance. A 1650 foot flat horizontal curve is to be used in a new segment of two-lane (each 12-foot wide) road. The surveyor has indicated that there is a very large clump of trees, the edge of which will be about 35 feet from the edge of the pavement at Station 32 + 50.00. If PC is at Station 28 + 00.00, how much, if any, will the edge of the trees be needed to be cut back if a desirable safe sight distance of 820 feet is to be observed?
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