The guide is explaining how to open 100% discovered map in ATS 1.55 with all map DLC excluding Iowa
I did the same guide periodically for ETS2 and ATS. If you did it for Missouri, you probably will not see new empty spots on map. Since #Iowa already released I started to discover it and will share the progress.

Files:

Source of discovered items https://sharemods.com/yd3fx9nrc3w8/trucksim100percent155.zip.html
Ready profile with 100% roads discovered https://sharemods.com/cmop3ku9lvj8/747275636B73696D2D6D617932303235.zip.html