Dear PAO,

I was driving to work along my usual route when I heard an ambulance siren wailing from several cars behind me. The cars were moving slowly at that time due to rush hour traffic. Despite the traffic crawl, I managed to move my car and let the ambulance pass. After several more minutes of driving, I saw a commotion involving the ambulance now on the side of the road, seemingly trying to make a turn at an intersection, but a private car in front of it was blocking the way and not moving. Since the cars were all moving slowly, I heard the private car driver shouting through his window and claiming loudly that he had the right of way. He even made a rude gesture at the ambulance. I was confused by the actions of the private car driver since I understand that ambulances should be given the right of way, or is that just an unwritten road etiquette? Because of this, I want to know if there is a specific law that tells who has the right of way between a private vehicle and an ambulance.