Ohio CDL Hazmat study guide
Ohio CDL Hazmat · Work through your exam, one topic at a time.
Ohio's Hazardous Materials (H) endorsement is added to a Commercial Driver License so the holder can legally drive a vehicle carrying hazardous materials in quantities that require placarding. Most candidates already hold or are testing for a Class A, B, or C CDL and add H because their employer's freight includes hazmat. The knowledge test is multiple choice and is organized into four areas of roughly equal weight: hazardous materials regulations and definitions; communication rules covering shipping papers, marking, labeling, and placarding; loading, unloading, segregation, and cargo securement; and driving and parking rules, emergencies, and incident response. Because each area carries about a quarter of the exam, a candidate who drills placard charts but skips segregation or parking rules is exposed on half the test. The Ohio CDL Hazmat study guide has 4 sections and about 1,316 words.
01Hazardous materials regulations and definitions
This domain tests whether you can apply the 49 CFR definition of a hazardous material, identify who is a hazmat employee, and separate shipper duties from carrier and driver duties. Under 49 CFR 171.8, a hazardous material is a substance or material that DOT has determined can pose an unreasonable risk to health, safety, or property when transported in commerce.
334 words, about 2 min02Communication rules: shipping papers, marking, labeling, placarding
This domain tests the paper and visual warnings that must travel with a hazmat shipment: the shipping paper, package markings and labels, and vehicle placards. The shipping paper basic description generally shows the proper shipping name, hazard class or division, UN/NA identification number, and packing group, in that order.
325 words, about 2 min03Loading, unloading, segregation, and cargo securement
This domain tests whether you can load hazmat without creating incompatible pairs, secure packages so they cannot move, and unload without releasing material. Before loading, inspect packages for damage, leaks, and proper labels.
321 words, about 2 min04Driving and parking rules, emergencies, and incident response
This domain tests how to move a placarded vehicle, where it may be parked, and what to do when a release, fire, or other incident occurs. Follow the parking and attendance rules in 49 CFR 397.
336 words, about 2 min