Protip: what Fairfax County police like to see on the road is conformity. You won't get pulled over going 65 on the parkway because everyone else is. But 72, you will stand out. A loud car, you will stand out. A car with blue headlights, you will stand out. And if you stand out, you're gonna have a bad time.
I'm not going to get all Sally the Self-righteous Safety Snail and wag my finger at people for speeding. "You shouldn't have been breaking the law!" does not justify disproportionately severe punishment. But that's just me.