IF Jane, I commute on my road bike, too. It has carbon bars that are ergonomically shaped and they cannot hold a light, so I also have to wait a few weeks to ride in. I like to get there early,with plenty of time to change before the students get there. I leave at 5:45 and get to school in about an hour. It's often still getting light when I leave, so I use a couple of blinkies and reflective strips on my arms.
You will love it!