Getting to work and back home requires two trips. For 2012 I’ve started tracking how I do each of those trips.
In January I had 21 work days, meaning 42 trips. Only 28 of those trips were by bicycle. There were three car-pool trips, four where I got a ride from someone else besides a co-worker, three trips on the bus, two in a cab, and two walking trips.
February is off to a better start. I’ve ridden my single-speed to work and back every day. My neck has improved enough that this isn’t too painful.