My normal cruising speed here in Atlanta Highways is 80 MPH - I've been passed numerous times by squad cars at that speed, and nearly run over by other cars/trucks if going slower. The exceptions are the smaller municipalities where I slow down to 5-10 over, depending on where and what the limit is. You really have to know your area, or be careful if you don't - and never, never speed in active school zones.

-- John