Student OV-chipkaart: Check in and out at all times from 1 January
As of 1 January 2012, students need to check in and out with their OV-chipkaart using Dutch national rail (NS) even when travelling in ‘free' times. The same applies when travelling on buses and trams.
special discounts will still be operational on the card, which means that students won't be charged any more than before this requirement. Lastly, students need to maintain a minimum of EUR 10 on the OV-chipkaart for the system to work.