To reduce our car use, my wife and I live less than 5.5 miles away from both of our jobs. We regularly ride our bikes to work. On Monday, however, my wife crashed and bruised her knee and shoulder enough that she can't ride to work. The fastest bus route takes 1 hr. 12 min. to go 5.5 miles If her knee didn't hurt, she could almost walk to work faster So until she heals, she's taking the car to work.
If we had a tandem, I could ride her to work and then ride over to my job.
Going car free is still a struggle in the suburbopolis of San Jose. Props to those of you who've figured out how to do it in sprawling urban wastelands.