I believe the answer is: False
Mandatory language is actually advisable to be used in this situation.
Using mandatory language would set a clear limitation that make the consumers understand the magnitude of the danger. This would make them much more likely to follow the written warning.
Gandhi was born on October 2, 1869. He was born in Porbandar, India.
If you live in an especially windy place, it's wise to grow corn in a sheltered spot or behind a windbreak. Bushy trees that absorb the wind or slatted fences are better than solid walls that reroute the wind over their top.