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Colorado Class R Knowledge Practice Test
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Traffic Signals & Road MarkingsStandalone practice
A traffic signal flashes red at an ordinary road intersection. What must you do?

Correct answer: Stop, then yield and go as at a stop sign.
Why
Stop at the marked stop line; if none, before the near-side crosswalk; if neither, at the nearest point with a view before entering the intersection. Then yield and proceed only when safe, as at a stop sign.
Verified against Colorado Driver Handbook · Flashing red signal · p. 10
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