Timed tickets, which can be used an unlimited number of times on any bus, tram, metro or train within a 20-minute period, are the cheapest option available, costing 3.40 Polish zloty (about $1 ...

On Track Innovations Ltd (OTI) one of the operators of the ticket vending machines in the Polish capital's underground (Metro) stations and the bus stops in the Warsaw vicinity, SIX Pay, an ...