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Washington Personal Driver Knowledge Test
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Passing target: 80% (32/40)
Vehicle Safety, Documents & TowingStandalone practice
You check the tires before a winter trip. At what tread depth does Washington law treat a tire as unsafe to use on the road?
An enlarged diagram shows a tread groove in cross-section with its surface and floor labeled. No dimension is selected.
Correct answer: Less than 2/32 of an inch
Why
Worn tires cannot push water away, so they slip and hydroplane on wet roads. Many tires have tread wear bars that show when the tread is worn to this level. Also keep the pressure at the value on the label on the driver's door edge.
Verified against Washington Driver Guide · Tires · p. 48
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