Get a toll box at the port/ border. Its free but you need to register it online. It can take 24hrs to become active, so the piage type gantries may show a red cross (think its red), but dont worry as it does work eventually just keep the confirmation text handy incase you get stopped .
Think you need snow chains now but not sure if its enforced. Its easy peasy and a lovely country so enjoy [emoji2]
Oh, and if you can, take vodka or whisky. You can sell it for like £60/70 a bottle!!! As long as customs dont take it from you first lol
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