I let my ball pythons hang out on my neck. I don't do that with my cornsnake, becasue she would take off.
They seem content to stay there, and I've not been choked to death and eaten by any of the ball pythons... yet! lol.
I don't DRIVE with one like that, because he'd go behind the seat, I always have them secured if for some reason I'm transporting one.
ON occasion when I've attended a local faire thing in the park, I sometimes take one, and usually, it's around my neck. I think since he can hide in my hair some, and my neck is warm, it makes him more secure.