According to the Texas manual, what sign shape is used exclusively for stop signs?
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A.
Diamond
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B.
Octagon Correct
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C.
Equilateral triangle
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D.
Pentagon
The answer is "Octagon"
The manual's shape table assigns the octagon exclusively to stop signs, which is why a driver can identify the rule from a distance before reading the word STOP. The trap is equilateral triangle: it sits one row above in the same 'exclusively' list and is the other shape a learner memorizes as an exact-match pair with stop, so the two get swapped in recall.
The traps in the wrong answers
A. Diamond
The diamond is exclusively for warning signs about hazards, and a stop sign is regulatory. Picked because a driver sees diamond-shaped alerts on the approach to junctions and confuses that placement with the stop sign itself.
C. Equilateral triangle
The equilateral triangle is the shape the manual assigns exclusively to yield signs. Comes from grouping the two 'exclusive' shapes in study and mixing which one belongs to stop and which to yield.
D. Pentagon
The pentagon is used for school advance and school crossing signs in the manual, not stop signs. Grabs a distinctive geometric shape because a learner remembers a few unique shapes are paired with unique sign types and reaches for the wrong one.
This question tests your knowledge of Road Signs in Texas. Source: Texas Driver Manual, "Chapter 5, Table 17: Signs by Shape," p.26..
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