val verde knows he must try to stop him before he kills someone.the officer calls for backup and makes a violent u-turn, just managing to avoid hitting an oncoming car. >> i pursue the vehicle in the westbound lanes of traffic so i'm going the correct flow of traffic and i'm watching him go against traffic. >> it's traffic chaos. cars and trucks swerve to avoid the wrong-way driver. >> they're doing everything in their power to avoid being struck by this vehicle. >> with lights and siren going, val verde pulls alongside the driver trying to get his attention. but the driver never even looks in his direction. >> just straight ahead, stone-faced, forward, like i'm not even there, like those cars are supposed to be on a two-lane road and they're going by him. he has no concept of what's going on. >> could he be ill, drunk or on drugs? the trooper realizes he has to do something drastic to stop this out-of-control truck. >> i attempted several times to go through the median to gain his attention. i even at one point was looking at an opportunity where