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What is the primary meaning and required driver response to an octagonal red traffic sign?
The answer
Answer: D. An octagonal eight-sided red sign always means STOP under Alabama law. You must bring your vehicle to a complete stop at the marked stop line or crosswalk before entering the intersection. If no line is painted, stop before entering the intersecting roadway where you have an unobstructed view. You may proceed only after yielding the right-of-way to all pedestrians and approaching vehicles.
Source: AL Driver Manual — Chapter 5: Signs, Signals and Road Markings (p. 41)