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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.
Answer Wiki. The width of a single travel lane can vary from 10'-12'. The faster the traffic is intended to travel, the wider the lane needs to be. Therefore, city streets with a speed limit of 25-30 mph should have 10' lanes, while highways should have 12' lanes.