The Tricross and other cyclocross bikes are often regarded as better commuting bikes than their road counterparts. I would be concerned that the road bike will fail you in the winter (unless you don't plan to commute in the winter), the Tricross would fit tires that would make biking in the snow and ice easier. Alternately you could just zip tie your road wheels, but that's a sorta half-assed solution. I would say to try riding to work and back on a day that you're off, and seeing if your route will be okay with the road bike, and if it isn't, pick up a tricross, or another similar cyclocross bike.