X endorsement visual testing differences app USA
The X endorsement is the Hazmat (H) and Tank vehicle (N) endorsements combined on one CDL. The visual placard questions come entirely from the hazmat side, and they are the same placards whether or not a tank is involved. The tanker side adds liquid-handling knowledge, not new placards.
X is H plus N
Think of the letters as building blocks. H lets you haul hazardous materials. N lets you operate a tank vehicle. X is the two together, which is what you need when the hazardous material rides in a tank, the very common chemical or fuel tanker.
What each part tests
The visual placard load lives on the hazmat side:
| Endorsement | Allows | Visual placards? |
|---|---|---|
| H | Haul hazardous materials | Yes, the nine classes |
| N | Operate a tank vehicle | No new placards; surge and handling |
| X | Hazmat in a tank (H and N) | Same hazmat placards |
Requirements and the exact test format vary by state. Confirm with your licensing authority.
Why the placards do not change
A hazard class is the same hazard whether it is boxed on a flatbed or carried in a tank, so the placard recognition is identical. That means your visual placard practice for the H endorsement carries straight over to the X endorsement. The extra X material is about how liquids and gases behave in motion. Verify the specifics in your official manual.
Frequently asked questions
- What is the X endorsement?
- The combination of the Hazmat (H) and Tank vehicle (N) endorsements on one CDL, for hauling hazardous materials in a tank. Confirm requirements with your state.
- Are the placards different for the X endorsement?
- No. The placards are the same nine-class hazmat placards. The tank-vehicle part adds liquid-handling knowledge, not new placards.
- Do I take two tests for the X endorsement?
- Generally yes, the hazmat and tank-vehicle knowledge tests, plus the TSA background check required for hazmat. Check your state's rules.