Coupon is tear one right, to my understanding, just like parking
coupon. You have to tear the date off before you start to drive and
if any tp / rov stop you, you have to show that you have teared the
correct date. In this case, the police are not able to login to the
system to check whether you bought or not.
I am sure you dont want to buy one just before you drive,
troublesome right, and also not to buy in a few days in advance,
just in case change of plan