@@quannguyenle2330there are random inspections inside tram if you have ticket, and if you don't, you have to pay a fine. It's a so called honour system
Thank you for this video. I am going to Vienna in July 2020 and was not sure how to use the tickets to ride on the U-Bahn or trams. I knew I needed to validate train tickets when I was in Rome and Florence last year but not sure about Vienna. You video was very useful.
