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 am an engineer working in Parramatta but living in Kingsford. Being a 40 min to an hour's drive everyday, I'd like to share expenses and maybe make the drive a little less boring. I have an '06 Honda Jazz in good shape so the cost shouldn't be that much