What's the best way to transport a bicycle by bicycle? I took my wife's bicycle to the bike shop for some work. When I did it, I carried it on a bike rack and drove it. I really don't want to drive just to pick up a bicycle. This place is really accessible by bike where I go to often.

Has anyone ever fastened the bikes together so that as you ride one the other one trails behind? I'm thinking of somehow tying the handlebar of the trailer bike to the rear rack of the main bike.