I just looked up the car crashes and it was 3 people to hospital as a direct result of the traffic, I got casualties mixed up with deaths. I'll edit my comment to say.
There's no exact figure on ambulances delayed, but given all the traffic it caused, but for heart attacks (all I could find good data on) the chances of surviving are halved in a 4 minute period (https://www.ahajournals.org/doi/10.1161/JAHA.120.017048), so factoring in all serious injuries there's a decent chance that at least one outcome was severely affected if not changed to death as a result of an ambulance being delayed.
What if it's a convolution though 🤔