SCS shared lots of old/new comparison screenshots in a blog post explaining the new system. Sounds like it’s been a huge task, with loads of work on art assets needed to support the changes too. They say that “for some weeks, the majority of all our teams had to stop working on anything else related to our future projects, and go over all the game objects, vegetation, vehicles, and effects; re-balancing things, again and again, to sync them on a shared agreed-upon albedo reference table.” Then they needed to tweak vehicle lights, and made new skyboxes, and… “Ultimately, no stone was left unturned, as we had to evaluate and adjust every single element of the games.” Update 1.40 also added more of those sightseeing cutscenes to landmark spots, this time in New Mexico and Oregon. More chassis types, new service signs in several states, and a general road sign update too. See the Update 1.40 release notes for more. The new lighting system is headed to Euro Truck Simulator 2 too. The next state coming to American Truck Sim in an expansion is Wyoming, then Texas will follow. American Truck Sim has a 75% discount on Steam until Monday, bringing the base game down to £3.74/€4.99/$4.99. Expansions and DLC packs have 10-70% discounts too.