Which shapes are used for STOP and YIELD signs?

• A. Circle for STOP and rectangle for YIELD
• B. Octagon for STOP and triangle for YIELD
• C. Diamond for STOP and circle for YIELD
• D. Rectangle for STOP and pentagon for YIELD

Answer: (B)

Shapes on road signs are designed so drivers can recognize what to do even at a glance. STOP signs use an octagon because that eight‑sided, highly distinctive shape is instantly recognizable from a distance and even when partially blocked, clearly signaling that you must come to a full stop. YIELD signs use a triangle to indicate you should slow down and give the right of way; the triangle shape conveys caution and yielding, guiding you to adjust your speed and proceed carefully.

Red borders and the sign colors reinforce the instruction, but the shape itself is the quick cue. That’s why the combination of an octagon for STOP and a triangle for YIELD is the standard. Other shapes wouldn’t communicate the same immediate action, so circle, rectangle, diamond, or pentagon signs wouldn’t be appropriate for STOP or YIELD in this context.