That tanker driver had to be the dumbest human being ever..
One minute he's shooting the other cars to protect his load. Next it's.."Ohh I'm going down a hill...Don't worry about hitting the brakes and saving the truck, all the gas I'm carrying and my job...I'll just grab my pet Iguana and jump...its all good". Incidentally I would love to know how he was gonna get back home. Hope his hitchhiking skills are good (though I doubt it)