Question

if you see a(n) ___ traffic signal, you must stop if it is safe to do so.

red
yellow
green
purple

Explanation:

Analyze the traffic signal prompt

The question asks: "If you see a(n) \_\_\_\_\_ traffic signal, you must stop if it is safe to do so." We need to identify which color signal matches this specific legal requirement.

Evaluate the options

Using the Traffic Light Meanings knowledge point:

• A red signal means you must stop completely and remain stopped until the light turns green (unless making a permitted turn after stopping). Stopping is mandatory, not conditional on "if it is safe to do so."
• A yellow signal warns that the light is about to turn red. Drivers must stop before entering the intersection, if it is safe to do so. If a driver is too close to stop safely, they may proceed cautiously.
• A green signal means go, if the way is clear.
• A purple signal is not a standard traffic control light.

Determine the correct choice

The phrase "stop if it is safe to do so" is the standard legal definition for a steady yellow light, as it balances the requirement to stop with the danger of sudden braking in an intersection.

Answer:

• red
• yellow (Correct answer)
• green
• purple