One card can contain up to four different kinds of fares. For example, an OPUS card can contain an STM monthly pass, 10 STL tickets, 6 CIT Laurentides tickets, and 2 train tickets for Exo zone 5, or both individual STM tickets and a weekly or monthly pass). Unlike other transit cards, such as Presto (Ontario) and Compass (Metro Vancouver), the OPUS is not a stored-value system. The appropriate fare is deducted when paying at any machine, in a similar fashion to PayPass, and daily, weekly, and monthly passes are used before individual tickets. The main goal behind the creation of this card was to reduce fare evasion in the province's transit systems.
