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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 average width of a car lane is 9 feet which is equivalent to  2.7 meters. However, this may vary in some cases like highways  which are 3.7 meters or 12 feet wide.t depends on what type of road or parking area the lane is in. I remember working for an Architect who did a lot of bank work, which have drive-thru lanes. The width of the lane at the outdoor teller station was either 7' or 8' wide, depending upon the preference of the owner.