There is no info about Ukraine and Belarus, so probably the next DLC will go southeast from 2018 expansion lands. Therefore, as the information from game-related forums says, the region where
SCS activity was spotted is already as big as Iberia, although its northern part doesn’t have much of highways:
I see some city is really dominating over everything else
, so if you need to go from (for example) Ryazan to Vladimir, you will either drive 90-70-90-70 km/h (like in Baltic or Poland!) on the narrow road with a really scary and dangerous shoulder:
or use the normal highway, which will make you see Moscow anyway
.