Having seen a real RTA outside our house at the weekend, I can point out some fundamental differences. The key one being that in fiction the police actually turn up.
Whereas in reality, when the (alleged) drunk driver tries to do a runner, its up to us bystanders to grab him, and, when they turn up, for the firemen to hang around until the police have a spare vehicle. Which, on a busy weekend evening, appears to take some time