On Monday I had to go over to Sanxia for the last visit to the Ophthalmologist to give me the all clear after my Cataracts had been dealt with - all good. Its only a short bus trip (I would walk but the Dahan river bridge has no sidewalk). And guess what, yes you need to check-in after boarding the bus - there is a QR sticker on the back of each seat as well as on the windows!!
And yes, I forgot, TRA and MRT have QR Code check-ins at each station too.
And another, we went to the RT-Mart at Dinghao, and fortunately they were not checking the odds and evens, as partner and I wouldn’t be able to go in together if they did, BUT, I had my NHI Card ready, which has my original odd ARC (my latest is an Even one) on it ready just in case. And RT-Mart too had more visible staff than customers.