pafisher when I was running the highways and byways of PA, the worst stuff to fall IMO, is the heavy wet stuff.
Packs into ice as soon as traffic passes over it.
The pretreatment is great for freezing rain or light fluffy snow as long as the temps (road surfaces) remain above the single digits. But let the surfaces be too cold and the light fluffy stuff melts, it will refreeze. SWEET!!! Bridge surfaces are notorious when pretreated then left unattended.
Only takes one vehicle like a single axle tractor pulling a set of pups losing traction and BINGO, traffic jam.
Hopefully that's what caused the problem and not an accident.
But once stuck and unless "chained up" nobody gonna go no where in them big trucks.
Good stuff, big trucks bring it....... unless they is in a ditch!!