Oklahoma CDL Hazmat: Placarding Test 2026

Those diamond-shaped signs on the sides of a tanker are a warning system, and this Oklahoma hazmat placarding test makes sure you post them correctly. Placards tell first responders what they are dealing with before they ever reach the truck, so every 2026 Oklahoma CDL driver with an H endorsement has to know the tables cold.

You will practice deciding when placards are required, choosing the right ones for a given material and quantity, and placing them on all four sides so they stay visible. Questions also cover the difference between Table 1 and Table 2 materials and the thresholds that trigger placarding in the first place.

Endorsement tests differ in size across the country, so check your Oklahoma Commercial Driver License Manual for the exact number of questions before test day. Keep running this placarding drill until the rules are reflexive, and your overall hazmat endorsement scores will climb.

Keep going:

• Oklahoma Hazmat Practice Test
• Oklahoma Hazmat Practice Test 2
• Oklahoma Hazmat Practice Test 3
• Oklahoma Hazmat Endorsement Test
• Oklahoma CDL Practice Test
• Oklahoma Air Brakes Practice Test
• Oklahoma CDL Combination Practice Test
• Oklahoma CDL Pre-Trip Inspection Practice Test
• Oklahoma Class A CDL Practice Test
• Oklahoma CDL Practice Test

Every question traces back to the Oklahoma CDL Manual - skim the right-of-way and signs chapters before your retake.