AAA has a computer program that you can run at home from a CD, which evaluates driving skills ... response time, reflexes, peripheral vision, limb strength, etc. You have to do a little running around ... for instance, press a computer key, then run 10 feet, then back to the computer and press the key again. But mostly it's done just sitting at the computer responding to the screen, and you can do it privately at home.
I've been doing it once a year since it became available. It's designed for seniors, but should be helpful for PALS, too, to see if their skills, strength or response times are slowing, and if so, by how much. I think it's free if you're an AAA member. .
At the end of the program, it gives you an evaluation and points out any areas that need work. If your skills are weakening in some areas, I *think* it has suggestions on how to modify your driving to stay safe. It doesn't address problems specific to driving with ALS, but sometimes it's easier for a driver to receive an objective evaluation, rather than a spouse or child telling them, "It's time for you to stop driving."
Just a thought.