Two wheels good? Bike vs Motorcycle as emergency transportation

With my Subaru out of commission last week thanks to a broken clutch fork, I had to get by bumming rides from coworkers and friends. I got to thinking that, since I do DD a high mileage car, it might not be a terrible idea to have a backup method of getting to work. I don't have any spare parking in my apartment… » 11/14/14 6:06pm 11/14/14 6:06pm