Today, at approximately 10:30AM on southbound I-81, two of your drivers apparently decided it would be fun to block traffic. They drove next to each other 10-15 MPH below the speed limit for no obvious reason other than to block traffic behind them. There was no one in front of them & 1/2 mile of traffic behind them. This continued for about five miles. The roads are dangerous enough without a couple of idiots playing games with gigantic trucks.