Under Section 40 of the Criminal Procedure Act, when is a traffic officer (as a peace officer) authorized to arrest a person without a warrant?

1. For any traffic minor infringement, regardless of identity.
2. If the person commits any offense in the officer's presence, or is reasonably suspected of committing a Schedule 1 offense.
3. Only when the officer has written permission from a senior superintendent.
4. Only if the suspect is driving a commercial passenger vehicle.