If they are the same gates as they have in Connolly then there has always been an issue with them when using magnetic cards. The delay between inserting the card and opening the barriers is about a second too long so that if you are walking when putting the card in, you end up too close to the barrier which triggers a sensor that blocks the barrier from opening.
They are fine with the newer smart-cards, but they were always just a little slow with magnetic cards. Ticket barriers are a fairly simple thing - they shouldn't need instructions. If you're explaining you losing.
I notice a poster that has gone up in Connolly explaining that it is very dangerous to tailgate through the barriers and could result in injury. Perhaps they shouldn't be install equipment that could potentially injure customers. You can legitimately have up to 6 people travelling on a single family ticket.
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