This is my best friend we're talking about.
It doesn't matter if I'm in a fight with my best friend or not - if they are in a car accident (worse than a slight fender-bender) I would be there at a moment's notice assuming I got a phone call about it.
This means I would rush to the accident scene, the hospital, wherever. Even across country or the world if necessary.
I'm the kind of friend you only need to ask once to be there for you.
And that goes for all of my friends. Not just my best.