The second trigger/ switch must be capable of being activated by the passengers from the main passenger compartment of the vehicle, independently of the driver trigger/ switch.
Rhaid i'r ail fotwm/switsh sbardun allu cael ei actifadu gan y teithwyr o brif adran teithwyr y cerbyd, yn annibynnol oddi wrth fotwm/switsh sbardun y gyrrwr