My son drives a truck from the Port of Pasco to the port of Seattle or Tacoma and back. He hauls containers of hay cubes or onions. He and his fellow drivers had to chain up to go over the pass coming home and the safest speed was 20 to 25 miles per hour the snow being that bad. Then, there was the trucker (unknown who he was) must have been doing 60 when he passed the convoy blinding every one with snow. My son being the last in line radioed ahead warning every one they were going to over taken by a speeder. Good thing they were not on a curve.
When they haul onions they have to remove the metal doors off the containers and put plywood half doors on or the gases emitting from the onions can explode. Wow! The things we do not know.