A truck accident that left the truck driver dead is believed to have occurred after the driver lost consciousness while driving. The truck accident occurred when the truck swerved, crashed into a guardrail and then into a bridge wall. The impact of the truck hitting the wall caused the truck to overturn and burst into blames, causing the death of the driver. The reason that authorities believe that the driver was unconscious at the time of the fatal accident is because a witness of the accident said they observed the tractor-trailer gradually slowly and then once it started to veer off the road there was no evidence of the driver trying to correct the truck. The reason why the driver was likely unconscious is unknown at this point in the investigation, but it is noted that the driver had a previous heart condition, which he was taking medication for. For more information on this truck accident, click here.