Move to Northern Virginia. Radar detectors are illegal, but that's a formality. Truth is it's so congested with traffic here 24/7 there's not enough room to break the speed limit. PROBLEM SOLVED.
ON the rare ocassion there is room to speed, worry not. Someone will cut right in front of you with plenty of open road, slow down, and thus act as an artificial speed limit for you.
I envy anyone who actually needs a radar detector, LOL