Solution: You are using a weather mod not designed for 1.40. Uninstall it immediately. The base game weather in 1.40 is significantly better than old mods anyway.
Updating your game to V1.40 is simple, but the method depends on your platform.
1. For Steam Users: If you already own the game on Steam, the update is automatic. American Truck Simulator V1.40 Download
2. For Demo Users: The V1.40 update applies to the free demo as well. Simply search for "American Truck Simulator Demo" on Steam to download the updated version and experience the new lighting system in the base states.
3. Official Website: You can purchase the game and its DLCs directly from the SCS Software website, which will direct you to the Steam store for the secure download. Solution: You are using a weather mod not designed for 1
Perhaps the most technically impressive change in V1.40, and one that had the community buzzing, was the complete revamp of the mirror rendering system.
In a game where you spend 90% of your time staring at the road and the other 10% checking your blind spots, mirrors are vital. Prior to this update, mirrors utilized a secondary, lower-quality camera render, which often resulted in jagged edges or "fisheye" distortions. V1.40 introduced Screen Space Reflections (SSR). mirrors utilized a secondary
This wasn't just about aesthetics; it was about immersion. Suddenly, mirrors reflected the world with pinpoint accuracy. You could see the chrome on your exhaust stack shimmering in the reflection. You could judge the distance of that cop car parked on the shoulder with precision. It was a subtle tweak that eradicated a long-standing visual disconnect, pulling the player deeper into the simulation.