If you watch a few of those "worlds greatest police chases" shows, you'll inevitably see truckers using their rigs as a rolling roadblock to help the police. I doubt they get tickets or get arrested.
I'm sticking to my position that we shouldn't rush to judgment.
By the way, to shift the question a bit, I hope the police had good reason to be in, as Roscoe would say, "peeeersooot!" Police chases get people killed, and then you find out the crime of the century that resulted in a Blues Brothers-esque collission was theft of a candy bar, or speeding or something. With the congestion on New Jersey's roads, and the population density, the Attorney General's pursuit policy says you can only pursue if, and I'm paraphrasing, a serious felony involving risk to life is in progress.
I'm not trying to shift blame, but if it was serious enough for the police to endanger the motoring public by engaging in a high-speed chase, maybe whatever was going on was serious enough to justify the risk to an ambulance, even if we're not supposed to "get involved."