PERMISSION+PROHIBITION

You cannot eat or drink. You must not eat or drink.

You can't smoke. You mustn't smoke

You must wash your hands.

You can drive at 30kph.

You must drive carefully.

You must not enter. You cannot enter.

You must stop.

You must wear a hard hat.

You must be silent. You cannot talk.

You cannot use your phone. You must not use your phone.

You cannot run. You must not run.

You cannot walk. You must not walk.