I can't believe that the cops actually enforce that in your area. That would a blessing in TN and GA where I drive quite a bit. In ATL, they have an HOV lane that alwasys is used by someone going less than the speed of traffic. Therefore, it is pointless to ride in that lane. The only time the HOV lane should be used is 1st, if there are multiple passengers and 2nd if you are going faster than traffic (whether you are speeding or it is grid lock).
One thing that GA enforces heavily and works versus TN is that trucks with multiple axles (mainly semis) can not use the left lane for any reason.