As star said, called someone. Also, check if there's any volunteer group that will provide a driver for situation like that just in case there's nobody you can call in this situation. Your local motor association should have the info.
IMO, Fed's backhand is terrible especially lately. Just like Sampras in his later days.
My memory of Sampras is vague now, but did he run around his backhand as much as Federer? Well, also Sampras came into the net so much more than Federer that he wasn't playing the same kind of baseline game Federer plays. I think young people learning about tennis should have to watch some tennis in the old days when players came to the net on a consistent basis just to know what a good net game actually looks like. As much as I never liked Sampras, he was amazingly quick at the net. Still I prefer Edberg at the net. Rafter was nice but probably not as physically suited to it as Sampras and Edberg.
Even when Federer's backhand was in top condition, it was not like Guga's. Too bad we never got to see Guga and Rafa play each other in top condition on clay. I would like to see that. Sometimes I can put myself back in time and hear Guga's moan/groan in my mind.