TO OPEN THE BARRIER: take a ticket. Park in any free space. Go to the office with your reservation and the ticket. If there is no-one there, ring the intercom.
DEPARTURE: use the card/device the staff gave you.
IF YOUR BOOKING ALLOWS UNLIMITED ENTRANCE AND EXIT: use the card/device the staff gave you.
Avinguda de la Catedral 8
Avinguda de Francesc Cambó 10