At what point should a motorcyclist begin to be extra cautious for slippery conditions after spotting a 'Slippery When Wet' sign, especially if it starts to rain lightly?

Question: At what point should a motorcyclist begin to be extra cautious for slippery conditions after spotting a 'Slippery When Wet' sign, especially if it starts to rain lightly?

Answer options:

• Only when heavy rain has been falling for several hours. ✅ Immediately upon the first drops of rain, as roads are most slippery then.
• After passing the area indicated by the sign.
• Only if the temperature drops below freezing.

Correct answer: Immediately upon the first drops of rain, as roads are most slippery then.

Explanation: Roads are often most slippery during the initial phase of light rainfall. Dust, oil, and other debris mix with water to create a very slick film on the road surface.