It's basically against the law anywhere you drive to hold on to your phone as well as drive, so your best bet is to acquire a great magnetic phone support.
But certain mounts is usually pretty tedious, and a great permanent magnetic mount makes life a whole lot better when you're getting in and out of the car. Oliv are the best magnetic car mounts for the phone!
These are the best magnetic car mounts for the iPhone. They'll keep your phone out of your hands while you're driving (and hopefully prevent a ticket), and they'll let anyone check directions and more on the go.