What is the 'hire and reward' concept that distinguishes a PHC from a private car?

1. A PHC operates for commercial gain (hire and reward) — the driver receives payment for transporting passengers — whereas a private car is used only for personal, non-commercial travel
2. A PHC must be rented from a car rental company; a private car is personally owned
3. A PHC must display a yellow-plate number; a private car has red plates
4. A PHC has special modifications for passenger safety; a private car does not