MURS radio's arn't cheap or real easy to find. CB's are inexpensive, have good range (much better than FRS), are widely available and widely used.
You are much better off using frequencies that everybody else does. While 11M is an optimal frequency for DX work, when conditions allow, I've never had and problem using it for local communications.
While HT's are handy, trying to hold one so you can hear it and drive is not the best thing to do. Vehicle mounted radio's are safer.
While I agree that AM CB is old technology, it does not mean it's not worth keeping. It's simple, it's rugged, it works.
Don't forget, commercial air communications is all AM.