one direction that are completed within two hours. Except for cash, these and other fares are stored on an OPUS card. Children 5 years of age and younger, accompanied by an adult, travel for free. Children under 5 cannot travel unaccompanied. OPUS On April 21, 2008, the STM unveiled the contactless smart card called OPUS (a word that phonetically includes the French word puce, which is the generic French word for the chip used in any type smart card ) as a means of fare payment. In preparation for this new step in Montreal's public transportation network, turnstiles which incorporate the reader and automated vending machines had already been installed in Metro stations; buses had previously been fitted with new fare boxes that incorporated the card reader in order to ensure the uniformity of methods of payment across Montreal's transit network and that of its suburbs. Costs to the STM related to the project were approximately , compared to the original estimated cost of some $100 million. The project was originally supposed to be implemented in 2006. In 2019, the STM announced plans to introduce improved OPUS card readers on buses beginning in 2020 in order to enable all-door boarding and debit card payment. Schedules and route information Each stop on each route is assigned a number and some of these systems require a user to know the number. In 2017 the STM introduced "iBus", a real-time GPS tracking system. It includes electronic signs inside buses showing the estimated time of arrival at upcoming stops and the busiest bus stops have electronic signs showing the estimated time of arrival of the next bus. All 68 Metro stations are equipped with the MétroVision information screens which displays advertising, news headlines and weather information from RDI and MétéoMédia, as well as STM-specific information regarding service changes, service delays and information pertaining to using the system. Accessibility All 197 daytime bus routes and 23 night routes are wheelchair accessible. All Metro lines except the Yellow line are accessible to wheelchairs. As of June 2021, there are 17 stations with elevators installed: Angrignon, Côte-Vertu, Du Collège, Snowdon, Lionel-Groulx, Bonaventure, Place-d'Armes, Champ-de-Mars, Berri-UQAM (orange and green lines only), Rosemont, Jean-Talon, Henri-Bourassa, Cartier, De La Concorde, Montmorency, McGill, Place-Des-Arts, Prefontaine, Honoré-Beaugrand, Jean-Drapeau, Vendôme, Viau, Pie-Xi . All of the elevators can be reached from street level. Connections to other transit services STM is connected to surrounding