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This value describes the intended use of the auxiliary lane in the primary or secondary direction, if present. Auxiliary lanes may include acceleration/deceleration lanes specific to intersections or access points, and also include any dedicated climbing lanes
along the roadway. Climbing lanes are typically located on freeways to facilitate passing maneuvers on steep hills, and are typically signed as climbing lanes. For climbing lanes, if the transition taper is located between the primary and secondary direction it is considered an “Inside Climbing” lane. If the transition taper is located on the outside of the through lanes in either the primary or secondary direction it is considered an “Outside Climbing” lane. All other auxiliary lanes are always located on the outside of the roadway.