Iberian Peninsula is connected to the rest of Europe with two main highways on the extremes of the Pyrenees (where the land isn't so rough and mountains lower).
In the Mediterranean side, that highway is the tolled AP7 going south until Barcelona. On the name of that road, A is for "autopista" (highway) and P is for "peaje" (toll). So, all AP-XX are tolled highways and A-XX are free highways on Spain (blue identifier with white letters)
Half the way from the French border to Barcelona is Gerona, small city but with lots of food, machinery, construction and a bit of paper industry near it. So, it could be modeled on the "disaggregated" way more than all the yards concentrated in one spot.
Between Barcelona an Gerona, the two more iconic landmarks are
this bridge for the high speed railway over the highway and
this resting area.
AP7 surrounds Barcelona from the inland side, flowing through all the dense industrial and commercial sites there are (the city itself has lost most of their factories for residential and offices zones). When the AP7 is near the southern part of Barcelona and it's airport (near in your 1:20 scale I mean), it splits in 2 directions. One keeps the AP7 name, continues south following Mediterranean coast all the way until Gibraltar. The other branch turn west, changes name to A2 non-tolled highway and goes to Lerida. Is there where Montserrat ridge that @Joan93 mentioned becomes an omnipresent view for lots of kilometers, due the terrain shape, the high that mountain is and it's very distinctive look (if I remember well, almost unique worldwide).
The next relevant city following AP7 south is Tarragona, with one of the biggest chemical industry zones of Spain. Some kilometers to the south there's
the nuclear power plant of Vandellòs just at the side of the highway and some more kilometers to the south there's
the viaduct over Ebro. Bridge isn't iconic at all, but it's the longest and abundant river of Iberian peninsula and it's very close to the river's mouth. So, it's a landmark on its own.
Returning where the AP7 splits near Barcelona, that A2 highway connects at Lerida (city with lots of food industry) with the with AP2 tolled highway that comes from Tarragona. That AP2 is the main road that goes to the central part of Spain for all the trucks that enter Iberian Peninsula from the Mediterranean side. So it's a must on a modeled Iberian peninsula for a truck oriented game like yours. If you ever add to the game more weather conditions, the Lerida zone is known for its infamous fog that can be dense as smog and last for lots of days. Bad combination for the huge amount of truck traffic that sustain that AP2.
There's a free highway named C-25 that connects directly Gerona with Lerida zone, to avoid do all the detour until Barcelona. I use to see lots of Portuguese trucks doing that route. It's a very scenic road because he crosses lots of mountain ranges (he's plenty of viaducts and tunnels and good views from above over plains far away). Very scenic but a pain in the ass for low-HP trucks, because the slopes on that road are hard and very long.
Here's the spot that I think it defines better that highway. Driving west, after exit a long uphill tunnel, you face a severe downhill doing a very long almost 180º left turn that is a viaduct. At the edge of the turn, the downhill becomes a hard slope uphill (and harder if you take the exit there) and enters another tunnel. It's like a rollercoaster turned highway.
If you decide to add Andorra country on the game, there's a road that comes down from Tolousse, crosses the country and goes down to Lerida where it connects with the main highways that I already explained. That route crosses some of the most scenic zones of this part of Iberian peninsula (talking about main roads, of course) like
Pas de la Casa (even now there's a tunnel to avoid it) or the
Coll de Nargó zone
All what I've explained so far, except Andorra itself, belongs to the autonomous community (Spanish "states", like German Länder) of Catalonia. It's a data relevant when you model the police cars (more info about that in other message when I've time).
Regards
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