If the person you're caring for lives in a metropolitan area, public transportation -- usually buses and trains -- can be a great way of getting around. But if he's unfamiliar with the public transit system, you can help by taking him on some orientation runs on the routes he's likely to use most. Go places together. Grab schedules and route maps as you go, for his home reference. As he learns the ropes, he should gain more confidence and enjoy the independence.
Cost: Tickets range roughly from $1 to $5 a ride, depending on the locale, agency, and distance traveled. Most have reduced senior fares and cost-saving passes that are cheaper than paying trip by trip.
How to find it: Do an online search with the terms public transportation or bus system with the name of his town. Or try these state-by-state transit-finder tools from the AARP and the American Public Transportation Association.
Tip: Local transit agency websites usually have maps, schedules, and fare information.
For more ideas on helping an older adult who can no longer drive, see "When Your Parents Can No Longer Drive".
Also check the website of the

Just came across your article doing some research for my Dad, great breakdown. Here in San Francisco there’s a “pay-for-service” company that’s doing something different. SilverRide offers vehicles with driver companions that accommodate senior needs. They also provide lifestyle concierge services to help keep seniors engaged. I haven’t seen this combo offered by others, seems to make sense.
Hats off to Kate for tackling this important subject. Another resource you can look for are professional chauffeurs. Look for companies like WeDriveU, a nice alternative for seniors who prefer to be driven in the comfort of their own car or Avis rental for medical appointments or social visits with friends & family. Rather than charging by mileage/distance, they charge a flat hourly fee.