One thing that's dawned on me lately is how much all these cars are like simple minded herd animals. They're potentially dangerous, but with a firm hand and a few slaps they get along just fine. You just have to keep an eye on them. When I treat the cars like cattle we all seem to get along better. Indeed, I've been surprised how responsive they are to a firm hand directing them to one place or another. You just have to be consistent and clear.
So instead of "cager" I suggest we start calling the creatures cattle or dogies. And telling them to get along.