The digital version versions of American Truck Simulator launched on February 2, 2016 and the retail version launched the next day. The base game's files only include the state California, which includes 20 cities that can be traveled to. Free day 1 DLC was released which added the state of Nevada which includes 9 cities. SCS announced that the state of Arizona is in the works and will also be released as free DLC in the near future. SCS also stated that most, if not all future map expansions after Arizona will be paid DLC. SCS's ultimate goal is to cover the entire continent of North America. However, the project will take years to complete. They will only be able to achieve their goal if enough people buy the game and the paid DLC to keep the project funded.
When SCS started development on American Truck simulator, there was a small team of 4 people working on it. Due to the fact, they decided to to scale the map smaller than the map in Euro Truck Simulator 2. Now that game has successfully launched, SCS is continuing development with a larger team and listening to customer feed back. On June 23, 2016, SCS announced that they where working on scaling up the map from 1:35 to 1:20. (Same scale as Euro Truck Simulator 2) The recasle was released as part of the 1.5 game update on December 12, 2016.
Nevada: was released as Free day 1 DLC when the game launched. It added 10 new cities to travel to.
Arizona: was released as free DLC on June 6, 2016. It added 15 new cities to travel to.
New Mexico: Released on November 9, 2017, New Mexico is the first paid DLC expansion for ATS. Adding 14 major cities, including Albuquerque, Santa Fe, and Roswell
Oregon: Released on October 4, 2018, Oregon is the 2nd paid DLC expansion for ATS. Adding 14 major cities, including Portland, Salem, and Eugene.
Washington: (In development)
Wheel Tuning Pack: In the 1.2 update, SCS made wheels more customizable. They also released the Wheel Tuning Pack DLC to add even more options. The DLC was released on April 13, 2016 for $2.99 USD. A video of what's included can be seen here.
Steering Creations Pack: In the 1.4 update, SCS made the truck's steering wheels adjustable. In doing so, it separated the steering wheel models from the rest of the interior model, which allows different steering wheels to be selected. SCS partnered with Steering Creations Inc (SCI) and modeled some of their aftermarket steering wheels for ATS. On September 14, 2016 SCS released the DLC, which includes 20 new steering wheels. for $2.99 USD. A video of what's included can be seen here.
As part of the 1.28 update, released on August 17, 2017, 3 more steering wheels where added.
Heavy Cargo Pack: The Heavy Cargo Pack was released on June 7, 2017. It adds a new trailer that's designed for heavy haul cargo. There are 2 different trailer configurations. 1 with 2 articulation points, and 1 with 3 articulation points. There are 9 new cargo types ranging from 25 tons to 55 tons. The trailer for the DLC can bee seen here.
Special Transport Pack: Released on November 7, 2018, the Special Cargo Pack takes the Heavy Cargo pack to the next level, with even larger and heavier loads. The loads are so large that they require specific routes, as well as pilot cars front and rear, to help control traffic.
Added the ability to purchase turnpike doubles (Nevada only)
Added road closures and detours to the random road events