If the automobile ahead of you stops at a marked or unmarked crosswalk to allow a pedestrian to cross, then it’s your obligation to stop also. Should you choose otherwise and proceed past the stopped car you are breaking the law and are subject to arrest and penalty. Even more serious, you are creating a dangerous and potentially-tragic situation. Last year in Provo a pedestrian was killed through this type of violation. Seeing a child at the crosswalk, the driver in the outside lane stopped. The pedestrian proceeded, but the car in the inside lane didnlt stop and tragedy resulted. We’ve personally seen similar violations, with more than one car hazardously and illegally whizzing by a car which had stopped to allow a pedestrian to pass. Fortunately accidents were avoided because the pedestrians sensed the danger and waited. Here’s the citation from 41-678, State Traffic Code, Subsection B: “Whenever a vehicle is stopped at a marked crosswalk or at any unmarked crosswalk at an intersection to permit a pedestrian to cross the roadway, the driver of any other vehicle approaching from the rear shall not overtake and pass such stopped vehicle.” That’s the law. Because it’s your duty, and for safety’s sake, obey it.