Dear Eric: My friend and I are in our mid-70s. We participate in several activities together – a book club, a continuing education class, et cetera. We often carpool together. I have begun to be very alarmed about my friend’s driving habits. She brakes unexpectedly, veers across the center line and seems quite distracted. I’m more and more reluctant to get in a car that she is driving, as I actually think I might be in danger.