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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.
Auxiliary lanes at intersections and interchanges often help to facilitate traffic movements. Such added lanes are to be as wide as the through-traffic lanes but not less than 10 ft. Where continuous two-way left-turn lanes are provided, a lane width of 10 to 16 ft. provides optimum design. Category: 231 Typical Section Elements for Roadways.