When she's not with you, walk around her car and look for signs of damage.
Everyone's car gets nicked now and then by someone else's door in a parking lot, but does her car have the kind of scratches or dents that could indicate driving mishaps? If so, ask her about them.
If you've observed some questionable driving on your mother's part, ask her whether she's gotten any tickets for speeding or other violations.
Naturally, it's best to do this in a neutral, nonaccusatory way at a time when she's not behind the wheel.
If you're not comfortable asking about tickets, ask whether her car insurance rate has gone up.
If your parent's rate has increased, this may be a sign that she's had driving infractions.
Check in with trusted friends and neighbors about her driving.
Don't wait for your parent's friends or neighbors to call you if you're worried about your parent's driving. They may feel uncomfortable approaching you with any concerns but may talk with you if you contact them directly. If you live far from your parents, try to identify one or two such people who would be willing to keep you informed about your parent's driving and other safety matters. Contact them regularly, and make sure they have your contact information as well, so they can reach you if anything comes up.
This article was very helpful to me. My father drives every day to his usual stops, often to new places. He volunteers for a charitable organization who help people in need. I've been concerned about his driving for quite some time. He has only one "good" eye and ear. On top of that, he has coordination issues due to a past surgery. He's not encountered any accidents, yet, but I've been in the car with him and he occasionally drifts and drives with less and less confidance. What is it going to take to get him to stop driving. I had a conversation with him about 6 years ago...
All of the above!
This article was useful to me. My father has been diagnosed with Parkinson's and his driving is getting worse. He speeds when he first takes off and brakes to hard to stop. Also, he has gotten lost recently. thank you and hope to see more articles on this.