Research shows that wearing your mask, and opening the front passenger window, and the window behind the driver seat helps to reduce the spread of the novel coronavirus in your vehicle. See this NY Times article.
I will be going to my office in D.C. either two days every two weeks or one day a week. I'm looking for a carpool or vanpool where I don't have to pay a flat monthly fee but rather, allows payment by number of trips. I prefer departure time from Fredericksburg around 6:30 a.m. or 7:00 a.m.