As you come around a bend you see a long queue of stationary traffic ahead, apparently caused by an accident further on. What is the correct traffic-management response?

1. Begin slowing in good time, take up your position in the queue, and watch for pedestrians who may be walking near the stopped vehicles
2. Move into the empty oncoming lane to bypass the queue
3. Sound your horn continuously to warn traffic ahead you are approaching
4. Follow closely behind the last vehicle so no one can cut in front of you