According to the RA Law on Ensuring Road Traffic Safety, the traffic constable is:
The person who has the authority to regulate the road traffic and carries out that regulation in the manner prescribed by law.✓Bonne réponse
Any traffic participant (driver, passenger or pedestrian) who takes traffic constable action in case of need.
All the persons listed.
Explication
A traffic constable is a person legally empowered to regulate traffic and performing that function in the prescribed manner. An ordinary driver, passenger, or pedestrian does not acquire that authority simply by attempting to direct traffic when a need arises.