ProMods

Is there any mod, console command or other way to mark as explored some roads and buildings (Or increase the "exploration area" of the truck)? I like to explore the map, see new roads, what I have seen and what I haven't, etc... but those big intersections that doesn't paint by itself are ugly to explore and see on the map, and sometimes, parts the road and buildings are bugged and you can't explore them. They leave the map mottled.

This has to get fixed by the developers of the maps then. When you find them with ProMods only, make a proper Bug report here:
https://www.promods.net/viewforum.php?f=29
read before how to report a bug:
https://www.promods.net/viewtopic.php?f=29&t=939

You totaly understanded him wrong. He didn't want to report a bug. He said

If there would be a mod to discover all int.

But answer is tottally no. Because intersections are made of custom "road" prefabs. Custom Ones"

I actually meant this part of the post:

and sometimes, parts the road and buildings are bugged and you can't explore them. They leave the map mottled.

With the custom Intersection Prefabs you're right.

... and there's no way to avoid this simply because of how the whole algorithm works. This also occurs for every new DLC from SCS, since they use the same method as well. It's because all new interchanges are fully modular nowadays...

It's a sport to find a delivery to drive over that one leaf of the cloverleaf intersection which you haven't explored before. It's part of the fun.

Or just drive over all 4 leafs in one run.

Leaf Rally
Done that. Following the speed limits.