Why ride gravel & dirt (and maybe even a little singletrack) on your road bike?
Adding gravel and dirt roads to your riding will open your cycling to a whole new world! Becoming comfortable with dynamic terrain breaks down any walls to new and glorious areas pavement-only-riding may have been keeping you from experiencing.
Gravel generally has fewer cars (if any at all sometimes), which can decrease encounters with automobiles. As roads seem to get busier, the gravel roads are a nice place to be able to retreat.