What is the first responsibility of an HTV driver if they are the first to arrive at a serious highway accident scene?

1. Overtake the crash scene and continue their trip to avoid delay
2. Park their truck in a safe location to avoid blocking traffic, turn on hazard lights, call emergency services, and render basic first aid if qualified
3. Take photos and post them on social media
4. Try to tow the damaged vehicles with their truck before police arrive