ss346.19(1)   

 (1) Upon the approach of any authorized emergency vehicle giving audible signal by siren the operator of a vehicle shall yield the right-of-way and shall immediately drive such vehicle to a position as near as possible and parallel to the right curb or the right-hand edge of the shoulder of the roadway, clear of any intersection and, unless otherwise directed by a traffic officer, shall stop and remain standing in such position until the authorized emergency vehicle has passed.