Pedal,
Congratulations. I see this as a growth step in your crossdressing and possible transgender life. It's a confidence builder for presenting yourself, and still safe on your own territory (the vehicle). For many CD's, myself included, a drive around the neighborhood was the very first outward public venture. I have a convertible, BTW.
Be careful about mirror gazing. Pay attention to your driving, please. But continue to drive pretty.