Nine you're fine, ten you're mine, in Virginia. I know a poster above said to drive the speed limit in Virginia, but that's not really necessary. Up to nine over and you're generally safe, especially if you're not acting foolish.
I see a lot of state troopers in Virginia using LIDAR (laser) these days. Unless you have a jammer (and know how to use it and react!), they'll get you.
Not sure a V1 is RDD visible. Some Escorts as well as a few others claim to be. I've done some research in the past, but honestly just try to be smart about when/where I go 10+ over. If they're using LIDAR, it's game over anyway.
Careful on 95 south of Richmond, near Emporia. That area is notorious for speed traps and tickets.