Colorado Tanker Vehicles Test
If you're hauling milk from Greeley or fuel over Raton Pass, this test covers the surge, the grades, and the crosswinds that make Colorado tanker work different.
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Colorado Tanker Vehicles test: 20 questions, 80% to pass. Focus on surge control, loading procedures, and braking on mountain grades.
Key Topics
- •Liquid surge control on mountain grades
- •Braking and retarder use on icy roads
- •Loading, unloading, and tank inspection
About the Colorado Tanker Vehicles Test
Topics Covered
- ✓Liquid surge and its effects — Colorado's mountain grades mean surge can hit you hard on downhill curves on I-70.
- ✓Loading and unloading procedures — you'll haul everything from crude oil on the Western Slope to milk from the Front Range; imbalance is dangerous.
- ✓Braking on grades — the runaway truck ramps on I-70 near Georgetown exist because tankers lose brakes. Know why.
- + 3 more topics
📘 Study Tips & State Info
Colorado's Tanker test isn't just about memorizing definitions. The DMV examiners here like scenario-based questions. They'll ask what happens when you brake hard on a downhill curve on I-70 with a partially loaded tank. That's real life. Study the CDL manual's section on liquid surge, but then think about how that applies to actual Colorado roads.
Pay attention to the loading section. Colorado has a lot of different tanker operations — milk tankers from Greeley, fuel trucks heading to mountain towns, water trucks on construction sites. The manual talks about proper loading sequences and weight distribution. Know it. Also, remember that Colorado's high altitude affects engine performance and brake effectiveness. The test won't ask that directly, but it helps you understand why the manual says things like "reduce speed on downgrades."
Colorado requires the Tanker Vehicles endorsement for any Class A or Class B CDL holder who will operate a tank vehicle of 1,000 gallons or more. You can take the written test at any CDL testing location, but you must make an appointment. The fee for the endorsement test is included in your CDL permit fee — it's $25 for a new permit and $12 for a renewal as of 2025. Check dmv.colorado.gov for the latest.
Major testing locations include the Lakewood DMV (1881 Pierce St), Colorado Springs (320 W Fillmore St), and Grand Junction (510 28 1/4 Rd). Walk-ins are not accepted for CDL tests. You'll take the test on a computer, and you'll get your results immediately. If you fail, you can retake it the next business day — no waiting period in Colorado.
One thing that trips up out-of-state drivers: Colorado doesn't accept third-party testers for the written knowledge exams. You have to go to a state DMV office. Plan ahead, because appointment slots can fill up two to three weeks out, especially in the Denver metro area.
About the Colorado Tanker Vehicles Test
The Tanker Vehicles endorsement is required if you plan to haul liquids or gases in a permanent tank with a capacity of 1,000 gallons or more. That includes milk, water, fuel, chemicals, or even beer — and Colorado has plenty of all of them. You'll take this test after passing General Knowledge, and it's 20 questions just like the federal standard.
Colorado's roads make tanker driving harder than most states. You'll deal with steep grades on I-70 through the Eisenhower Tunnel, sudden crosswinds on I-25 north of Denver, and mountain passes that can freeze overnight. Liquid surge behaves differently at 11,000 feet than it does at sea level. The test expects you to know that.
The Colorado DMW administers this test at all CDL testing locations — Lakewood, Colorado Springs, Grand Junction, and others. You need an appointment for CDL testing, and you'll take this on a computer at the office. Bring your permit, medical card, and ID. No walk-ins for CDL tests.
You can take our practice test as many times as you want. It pulls from the same topics the CDL manual covers. The real test has 20 questions, you need 16 right. We give you 25 minutes, same as the DMV does.
Topics Covered
Study Tips
Colorado's Tanker test isn't just about memorizing definitions. The DMV examiners here like scenario-based questions. They'll ask what happens when you brake hard on a downhill curve on I-70 with a partially loaded tank. That's real life. Study the CDL manual's section on liquid surge, but then think about how that applies to actual Colorado roads.
Pay attention to the loading section. Colorado has a lot of different tanker operations — milk tankers from Greeley, fuel trucks heading to mountain towns, water trucks on construction sites. The manual talks about proper loading sequences and weight distribution. Know it. Also, remember that Colorado's high altitude affects engine performance and brake effectiveness. The test won't ask that directly, but it helps you understand why the manual says things like "reduce speed on downgrades."
Colorado Specific Information
Colorado requires the Tanker Vehicles endorsement for any Class A or Class B CDL holder who will operate a tank vehicle of 1,000 gallons or more. You can take the written test at any CDL testing location, but you must make an appointment. The fee for the endorsement test is included in your CDL permit fee — it's $25 for a new permit and $12 for a renewal as of 2025. Check dmv.colorado.gov for the latest.
Major testing locations include the Lakewood DMV (1881 Pierce St), Colorado Springs (320 W Fillmore St), and Grand Junction (510 28 1/4 Rd). Walk-ins are not accepted for CDL tests. You'll take the test on a computer, and you'll get your results immediately. If you fail, you can retake it the next business day — no waiting period in Colorado.
One thing that trips up out-of-state drivers: Colorado doesn't accept third-party testers for the written knowledge exams. You have to go to a state DMV office. Plan ahead, because appointment slots can fill up two to three weeks out, especially in the Denver metro area.