Washington Doubles and Triples Test

About the Washington Doubles and Triples Test

Getting your Doubles and Triples endorsement lets you haul multiple trailers across Washington's highways. But you can't just wing it — the state's unique geography and weather demand extra skill. That's where our practice test comes in.

Washington drivers face challenges you won't find everywhere. You'll navigate steep grades on I-90 over Snoqualmie Pass, deal with rain-soaked roads on I-5 near Seattle, and share lanes with logging trucks on US 2. Add in fog from the Puget Sound and snow on the Cascades, and you see why the knowledge test matters. This endorsement covers coupling, air brake systems, and off-tracking — all critical for safe doubles operation.

Our 20-question practice test pulls from the official Washington CDL handbook. We focus on the topics that trip up most drivers, like weight distribution and emergency procedures. Each question comes with a detailed explanation to help you learn, not just memorize.

Ready to get serious? Take the test as many times as you need. When you consistently score 80% or higher, you're ready for the real thing at your local Washington DOL office.

What This Test Covers

• Coupling and uncoupling – critical when you're swapping trailers at a quick-stop in Ellensburg.
• Air line inspection – Washington's rainy climate makes moisture freeze a real hazard in winter.
• Weight distribution – keep your load balanced on the steep grades of I-90 near Cle Elum.
• Off-tracking – those sharp curves on US 2 through the Cascades demand wide turns.
• Safe following distances – fog banks near Puget Sound mean you need extra space.
• Emergency procedures – a sudden stop on an icy mountain pass can end your career.

Study Tips

Start with the Washington CDL handbook. Read the Doubles and Triples section twice — once for general knowledge, once for every detail on coupling procedures and air brake timing. Highlight the weight limits: 80,000 lbs gross, 28-foot trailers for doubles, and specific restrictions on triples.

Take our practice test in a quiet spot. Don't guess; read each explanation. Focus on areas where you score low. Retake the test until you hit 80% three times in a row. Then schedule your DOL appointment — you'll breeze through it.

One more thing: Washington's endorsement test is only knowledge-based, no skills. But don't slack off. The questions are specific to state regulations, like when you need chains on Snoqualmie Pass. Know your rules.

Washington DMV Information

To take the Doubles/Triples knowledge test in Washington, you need a valid CDL permit first. You can take the test at any DOL driver licensing office that offers CDL services. Popular locations include Bellevue, Spokane, Tacoma, and Everett. Appointments are required — book online at dol.wa.gov or call your local office. Walk-ins aren't guaranteed.

The knowledge test costs $10 per endorsement. If you pass, you pay a $35 endorsement fee when they issue your license. You can retake the test as many times as needed, but you must wait one day between attempts. Bring your permit, proof of identity, and glasses if you wear them.

After passing, your “X” restriction for doubles/triples appears on your CDL immediately. Some employers also require a practical road test, but the state doesn't — so this test is your only hurdle.

Frequently Asked Questions

Related Resources

Other Washington CDL Practice Tests

Test Details

• State: Washington
• Test: Doubles and Triples Test
• Questions: 93
• Passing Score: 80%
• Time Limit: 25 minutes
• Cost: Free

Need ELDT Training?

If you're getting your first CDL, you need ELDT theory training before your skills test.