This morning on my way to work I see these trucks with Government tags together. I have seen these kinds of trucks before usually traveling in a convoy. This group was headed west on I-40. The others I have seen have been headed east on 240. They don't have any markings on truck or tractor. There is a follow truck, 3 semi-trucks, and then a truck up front about a mile. I guess these guys are hauling hazardous waste of some kind? Anybody else see these convoys before or know what they are hauling?