Here’s one of many streams Aliensrock did Balatro is a roguelite so it means you’ve gotta collect some form of items, in case of Balatro it’s jokers, tarot or planet cards and more, to make yourself better until there comes a point where you lose and start from scratch but with new things unlocked like other decks or challenges.

My guess would be that they are separated from any traffic, just like a subway and unlike trams or buses which are a part of it. No other traffic = less delays and accidents = more reliable transport