ah-just found itI'm surprised you're using the "tailgate" term. The police never said that, it's the media's spin on it. The police said a flatbed truck that was blocking the street was moved to let an ambulance through. He got through while that truck was out of the way. None of us know how long that truck was moved for, how close to the ambulance he was, or whether he mistakenly assumed the road had been reopened.
she says 'able to follow an ambulance' 'after the road block was temporarily lifted'
You are correct-I've made an assumption on the closeness but as you point out we don't know if he tailgated.