Tanker endorsement practice test
The N endorsement covers hauling liquids and gases in bulk. The test is short but conceptual: it wants to know you understand surge, outage, and why a tanker rolls over at speeds a dry van shrugs off.
Tanker Endorsement Question 1 of 10
On a tank vehicle pre-trip, you should pay special attention to:
Who needs the N endorsement
You need it when driving a vehicle with permanently or temporarily attached tanks — individual capacity over 119 gallons and total capacity of 1,000 gallons or more. That includes fuel tankers, milk trucks, water trucks, and box trucks carrying IBC totes above the threshold.
Hauling hazardous materials in a tank (gasoline, for example) requires the combined X endorsement — tanker plus hazmat, including the TSA background check.
The three ideas the test keeps asking about
- Surge — liquid keeps moving after the truck stops, shoving it forward; brake early, hold the brakes at stops, and leave a bigger gap
- Outage — room left in the tank for the liquid to expand as it warms; you never load a cargo tank completely full
- High center of gravity — the load rides high and shifts, so posted curve and ramp speeds (set for cars) are too fast for you
Frequently asked
- How many questions are on the tanker test?
- Usually about 20 questions, with roughly 80% to pass. It is knowledge-only — no separate skills test in a tank vehicle.
- What are baffles, and do all tankers have them?
- Baffles are perforated bulkheads that slow front-to-back surge. Food-grade tanks are often smooth bore (no baffles) because sanitation rules make baffles hard to clean — which makes surge strongest exactly where you might least expect it.
- Do I need the tanker endorsement for a few drums of liquid?
- Only if an individual container exceeds 119 gallons and your total liquid capacity reaches 1,000 gallons. Below those thresholds no N endorsement is required.