Ditto to what Gary and David said;
at the very least have a backup plan.
I was capable to drive drive to the rad TX by myself, although on 4 or 5 occasions during the first 2 weeks I had my brother or wife come along. Naturally, they were driving then. The fact that I did this provided some activity (which was good especially later on when you do not feel that you have any control). However, be especially careful if you use heavy pain killers! It is not a good idea to drive if you are knocked out! It would be very bad to have an accident during RT. My round trip was 40 miles and that with little or no traffic.
On the more funny side... the only time I ever managed to get out of a speeding ticket was when I was on my way to for an IMRT treatment. (Officer give me a ticket or do not, but whatever you do do it quickly please I need to go for radiation therapy for cancer and I am late; that is why I am speeding.....)


M