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The width of an auxiliary lane should be equal to the through lanes. Where auxiliary lanes are provided along freeway main lanes, the adjacent shoulder should desirably be 2.4 to 3.6m [8 to 12 ft] in width, with a 1.8m [6 ft] wide shoulder being the minimum considered.
Originally Posted by Pecos. If the driveway is 30 feet long and an average of 21 feet wide (12 at the top and 30 at the road leaves about 21' at the midway point), then at just 4 inches thick it figures 7.7 yards of concrete.