What must the driver of an ambulance do when approaching an intersection where the traffic signal is red?

1. Drive through at normal speed, as other vehicles must clear the intersection
2. Stop or slow down to a safe speed, confirm that oncoming and cross traffic has yielded, and then proceed with caution
3. Deactivate the siren to avoid confusing other drivers before crossing
4. Turn right only, as driving straight through a red light is strictly prohibited