Question

what does this road sign mean?
no idling for more than 3 minutes
no stopping for more than 3 minutes
idling permitted for at least 3 minutes
no smoking for more than 3 minutes

Explanation:

The sign shows a prohibition symbol (red circle with a slash) over an image of a vehicle engine (indicating idling). The text "3 MIN IDLE LIMIT" clearly states the time - related restriction on idling.

Answer:

No idling for more than 3 minutes