Some folks don't have the $1500 bucks for the 15 mile ride.
He has insurance.
And second of all, stop worrying about the damned money.
No one, and I mean no one has to go bankrupt over this stuff. Do some research: if you pay your insurance, they will pay for the ambulance. If you cannot afford the remainder, they will send it to collections, but no one is going to put a lien on your house or attach your savings for the difference.
Yes, it will be annoying, but if you have that little money...you have been down this course before.
You should hear some of the crazy stuff people call ambulances for. The people in the ambulance would much rather be dealing with an honest poor person than some of the dregs of society they deal with every day.
Please, everyone, do not be cheap or stupid about this. You do not want to have your heart stop beating with your elderly wife driving the car. Why would anyone do that to someone they love.