While driving on an expressway, you see crashed vehicles stopped in the lanes ahead. What is the most appropriate way to drive?

1. ①Slow down sharply in the next lane and look at the crash scene closely as you pass
2. ②Turn on the hazard lights to warn vehicles behind, slow down early, pass safely while keeping distance from the crashed cars, and report if necessary
3. ③Stop your car in the lane right behind the crashed cars, get out and run to them
4. ④Speed up and overtake on the shoulder to get away from the scene quickly