There's only a handful of regular FM State Police channels, put them all in your scanner, especially the car-to-car freqs as you never know when you'll hear something on them. But plan on getting a digital scanner if you aren't equipped yet.
You might also try the VDOT freqs, they can be good during bad weather, snow, flooding, etc. Boring most of the time however.
Of course, your local Sheriff -Fire/rescue too.