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What is the exclusive legal meaning of an eight-sided (octagonal) red traffic sign in Colorado?
The answer
Answer: A. An eight-sided octagonal red sign means you must come to a complete stop at the marked stop line. If there is no painted stop line or crosswalk, stop at the point nearest the intersecting roadway where you have an unobstructed view of approaching traffic. Rolling through a stop sign without stopping is a moving violation that endangers pedestrians and cross traffic.
Source: CO Driver Handbook — Traffic Signs: Stop Signs (p. 7)