I never see people validating their tickets on public transport in Sarajevo. Can I travel for free?
You are supposed to buy your ticket at a kiosk before travelling and validate it in the machine on the tram or bus. There is usually only one machine, so try to board at the correct door, even if the locals routinely board using the exit doors – otherwise you will have to fight your way through a crowd to get to the machine. It’s true that most locals don’t validate tickets, but that’s because they have passes rather than single-journey tickets. I have seen teams of inspectors at work and everyone was able to produce passes when asked.