A new OV Chipkaart system has been introduced in Amsterdam this year, and it will be available in all of the Netherlands in a few years. The concept is generally OK: no more counting of strips on a strippenkaart or buying train tickets; just transfer some money to the card and go (there is the thing where the card issuer can track who went where, and when, but I trust that will be resolved in time).
But there's a usability problem with the gates: it's not immediately obvious where you should wave your card (especially if you're left-handed). The gates seem to have sensors on both sides, but the one on the left is actually the one on the right for the next gate. I've only used the system for the first time today, but I've already opened the wrong gate twice, requiring me to run around to the right gate. Luckily it wasn't too busy..
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