Intercity travel is mainly by train (ZSSK) and long-distance bus: Bratislava–Poprad about 4 hours, Bratislava–Košice about 5 hours. Train tickets are recommended to be bought online with a seat reservation added (about 1 euro); on popular mountain routes, travelling without a seat reservation very easily means standing the whole way. From Poprad into the Tatras, transfer to the Tatra Electric Railway (TEŽ): Poprad–Starý Smokovec about 30 minutes, Starý Smokovec–Štrbské Pleso about 40 minutes; single tickets and 24-hour passes are both on the order of a single-digit number of euros, and tickets must be validated in the on-board validator, details subject to ZSSK announcements. Bratislava city has trams, trolleybuses and buses; a 24-hour ticket costs several euros, tickets must be bought before boarding and validated immediately, and inspection fines start at tens of euros, subject to official announcements. Internationally, Bratislava is only about 1 hour by car from Vienna, and taking a train or bus to and from Vienna Airport is a common entry route. In mountain winter (November to March of the following year), the law requires winter tyres; high-altitude trails are mostly closed from 1 November to 15 June of the following year, subject to official announcements. For taxis, use licensed apps; for street taxis, confirm the meter first.