According to the Texas manual, the diamond sign shape is used exclusively for what purpose?
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A.
Identifying a state route number
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B.
Marking the boundary of a work zone
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C.
Advising of an upcoming service exit
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D.
Warning of hazards on the road or nearby Correct
The answer is "Warning of hazards on the road or nearby"
The manual's shape table gives the diamond exclusively to signs that warn of existing or possible hazards on roads or adjacent areas. The trap is marking the border of a work zone: work-zone signs are also diamond-shaped, so a learner remembers the shape from orange construction alerts and treats the boundary of the zone as the diamond's job, when the manual actually assigns the shape to the hazard warning itself.
The traps in the wrong answers
A. Identifying a state route number
State route markers use their own outline shape, not the warning diamond. Reached for because a learner recalls that diamonds appear on major highways and confuses hazard warnings with route identification.
B. Marking the boundary of a work zone
Work-zone boundaries are marked by barricades and channelizing devices, not by the diamond shape itself. Picked because orange diamonds appear inside work zones and the learner attaches the shape to the zone rather than to the hazard it names.
C. Advising of an upcoming service exit
Service guidance uses blue rectangular signs in the manual, not diamonds. Chosen by a driver who sees a diamond above the highway and assumes any prominent overhead shape must be pointing to services ahead.
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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