Potentially dangerous elderly driver?

A co-worker has told me that her 89 yo father has very poor eyesight, fluctuating blood pressure, intermittent dehydration and possibly the onset of dementia. He has also failed to renew his drivers license as he doesn't think he will p the eye test. He drives daily during the early morning to meet his friends for coffee during he height of school bus activity. He also drives daily to the grocery store during the height of school buses dropping students off at their homes. I am terrified that he is going to strike a student going to or from school. I have begged her to make him stop driving as he is a danger on the roads. She won't. Should I contact the town's police department and report him? What should I do?