Two Stops, Two Sets of Numbers, and a Leftover DANGEROUS Placard
It is 06:15 and you are loading a 53-foot van. At the first dock you take on 1,500 pounds gross of UN1263, Paint, Class 3, PG III, on 22 pallets of pails. Stop two is a 40-mile run to a hardware distributor, where you will add 950 pounds gross of UN1760, Corrosive liquid, n.o.s., Class 8, PG II, in ten 55-gallon drums. Neither stop involves a bulk package, a hazardous waste, or a hazardous substance above its reportable quantity. Dispatch tells you: 'Each stop is a separate shipment and each one is under 1,001 pounds, so no placards are needed. Besides, there is already a DANGEROUS placard on both sides of the trailer from the last driver.' At the second dock you notice the CORROSIVE placard that used to be on the rear door is gone, and the mounting holes are visible. Both DANGEROUS placards are faded, and the one on the left side is peeling at the corner.
1. Work the numbers for each leg and state which placards, if any, are required.
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The trigger is not the bill of lading. It is what is actually on the vehicle. The 1,001-pound exception applies only when the aggregate gross weight of all Table 2 materials on the vehicle is under 1,001 pounds. Both Class 3 and Class 8 are Table 2.
Leg one: 1,500 pounds gross of Class 3 is already above 1,001 pounds, so the FLAMMABLE placard is required. Dispatch's arithmetic fails on the first leg before the second stop is even considered.
Leg two: the vehicle now carries 1,500 plus 950, or 2,450 pounds gross of Table 2 material in two hazard classes. The aggregate is well over 1,001 pounds, so every Table 2 class present must be placarded: FLAMMABLE and CORROSIVE. Because the aggregate also exceeds 2,205 pounds and at least two Table 2 classes are aboard, and because no Table 1 material is present, the DANGEROUS placard is permitted in place of the two specific Table 2 placards. Permitted, not required. Either FLAMMABLE plus CORROSIVE, or DANGEROUS, is a compliant leg-two configuration. What is not compliant is a single unplacarded trailer carrying both shipments, which is what dispatch has proposed.
2. Is the leftover DANGEROUS placard acceptable on leg one or as a general-purpose cover for the whole trip?
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No on leg one, and it is not a general-purpose cover either. On leg one the trailer holds 1,500 pounds of one Table 2 class. That is above the 1,001-pound threshold but below 2,205 pounds, and the DANGEROUS substitution is available only when the aggregate gross weight of Table 2 material reaches 2,205 pounds. So on leg one the trailer must display FLAMMABLE, and displaying DANGEROUS instead is prohibited placarding because no material on board permits that placard.
On leg two the DANGEROUS placard becomes permissible, since 2,450 pounds of two Table 2 classes is aboard. But permissible is not the same as automatic. The placard must accurately correspond to what is loaded, it may never substitute for a placard required by a Table 1 material, and a placard left on the vehicle from a previous load when nothing on board justifies it is itself a violation. Before you pull out on leg one, the DANGEROUS placards come off and FLAMMABLE goes on. The practical framing for dispatch: a placard selection is a decision made per loaded vehicle, at the moment of departure, from the shipping papers and the freight actually on the floor. It is not a sticker that stays on the trailer until somebody peels it off.
3. What placard placement and condition problems exist, and what do you fix before moving?
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Placement: placards must be displayed on both sides and both ends of the transport vehicle, so the missing rear-door CORROSIVE placard on leg two leaves the rear end unmarked. The trailer's sides are covered only by the faded DANGEROUS placards, which are the wrong placards for leg one anyway.
Condition: placards must be legible from the direction they face and must not be obscured, dirty, faded, or peeling. A peeling corner will lift in the wind at highway speed and can strip off entirely. Replace both DANGEROUS placards with fresh stock rather than reusing them.
Sequence of work before departure: on leg one, remove the DANGEROUS placards from both sides and install FLAMMABLE on both sides and both ends. At the second dock, install the rear CORROSIVE placard or the full DANGEROUS set, then walk the trailer once and confirm four faces. Also check that the numbers on the papers, the placards, and the freight on the floor agree, because the loader at stop two could hand you a different quantity than the paperwork says, and the placard decision is made from what is loaded, not what was ordered.