TO OPEN THE BARRIER: take a ticket. Park in any free space. Go to the office with your reservation and the ticket.
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.
Carrer d'Entença 21
Carrer de Sepúlveda 58
Avinguda de Mistral 38