Slow to 30 mph so be able to safely change lanes if needed.
Continually flash high beams on/off.
That guy had been wrong way for about forty miles and came out of Louisiana and the CB made everyone aware.
Second time was quick as I was first truck/vehicle as someone entered interstate from exit ramp and I had a lot of trucks half mile behind me.
*Did same a third time coming home on a Super Bowl Sunday with kids my car, but slowed to 20 mph if needed to jump a curb.
Wow! Awesome response to a most difficult situation.