Why do ads appear every time a route is finished?
Bus Simulator: Ultimate Guide

The game is free to play, therefore there are some features that are added to promote ads. This is one of the ways that the game can manage itself through advertising revenue.
If you do not want to watch any ads, you can support the game by getting the starter kit on the home screen. This provides you with a bus, money, as well as the ad removal feature.
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