Hazardous Materials (H endorsement) knowledge requirements
The Kansas CDL hazardous materials (H) knowledge test checks whether you can apply 49 CFR Parts 171–180 in the cab and at the loading dock. It is not a chemistry test; it tests recognition, documentation, placarding, loading, parking, routing, and emergency response. Kansas also requires a TSA threat assessment before the H endorsement is issued, but the knowledge test is separate.
Hazard classes and shipping papers
Know the nine classes and key divisions: 1.1–1.6 explosives; 2.1 flammable gas, 2.2 nonflammable gas, 2.3 toxic gas; 3 flammable/combustible liquid; 4.1 flammable solid, 4.2 spontaneously combustible, 4.3 dangerous when wet; 5.1 oxidizer, 5.2 organic peroxide; 6.1 toxic, 6.2 infectious; 7 radioactive; 8 corrosive; 9 miscellaneous. Shipping papers must show the proper shipping name, hazard class/division, UN/NA ID number, packing group, quantity, and a 24-hour emergency response telephone number, plus the shipper’s certification. Keep them within reach while driving.
Placards, loading, and parking
Placard both sides and both ends. Table 1 materials need placards in any quantity; Table 2 generally at 1,001 lb aggregate gross weight. Bulk packages need placards on all four sides. Load so packages cannot move, and keep food away from toxic materials. Park at least 5 feet from the traveled portion of the road; for Division 1.1, 1.2, or 1.3 explosives, avoid parking within 300 feet of a bridge, tunnel, or occupied building. Stop at railroad crossings when carrying certain explosives, and never enter a tunnel posted against hazardous materials.
Worked example: You load 700 lb of a Table 2 flammable liquid and 200 lb of a Table 1 toxic material. You must placard the toxic material because Table 1 has no threshold; you do not placard the flammable liquid because 700 lb is below 1,001 lb. If the flammable liquid were 1,100 lb, placard both.
Traps: treating 1,001 lb as a per-package limit; forgetting the emergency phone number; placing placards only on the rear; assuming a tunnel route is legal because the vehicle fits.