Where should an officer park their patrol vehicle when arriving at a crash scene on a highway to create a safe work zone?

1. Directly next to the damaged vehicles in the middle of the road.
2. At an angle behind the crash scene (upstream of traffic), using the vehicle as a physical shield and maximizing the visibility of warning lights.
3. On the opposite side of the highway to keep the lane clear.
4. Off the road completely on the grass, with lights switched off.