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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.
The standard width for a US two-lane highway is 30 feet. The  driving lanes are 12 feet wide in both directions. The shoulders  are three feet on each side.Edit.he standard width for a US two-lane highway is 30 feet. The  driving lanes are 12 feet wide in both directions. The shoulders  are three feet on each side. Edit.