I had to drive an hour each way to Clatterbridge for my RT. Certainly no problem to do so, although I was having to stop for a pee on the way home in the last couple of weeks. I think most men (certainly as reported here) find the side-effects of RT relatively mild. I'd put mine into the category of annoyances rather than problems. As Barry mentioned, having to get up frequently during the night to pee was perhaps the most significant. I bought a plastic urine bottle so I didn't have to get out of bed and that helped with the resulting tiredness a lot.
Side-effects generally peak a few weeks after the end of treatment, and then gradually tail off. For me it took perhaps 6 weeks for the peeing to return to normal, but much longer (6 months to a year) for the bowel issues to calm down. Now almost two years after RT (it'll be two years in March), I still take Tamsulosin to help with urine flow (RT commonly results in a permanent swelling of the prostate) and I probably will for the rest of my life, and I have rather more frequent bowel movements than I did before, but that's about it. I've found it all relatively plain sailing.
Best wishes,
Chris