Staggered Speed Limits per Lane
Stagger Speed Limits - Place new signs where the far left lane's speed is 75 MPH , the middle lane is 70 MPH, and the right lane 65 MPH.
Of course there is a law that says "Left lane for passing", however, traffic flow would be encouraged by a new law that "staggered the speed limits per lane", thus preventing everyone from driving shoulder to shoulder because they are afraid to get a ticket for passing to fast. Also, make sure to ticket folks that drive to slowly in the left lane under the new laws. Also, this increases safety as using the right lane to speed becomes more flagrant.