ah, that's very cool. Makes me think of all kinds of NATO-level shit that's strewn around the world waiting to be uncovered ;)

The thing with the road in Uruguay is that as you're driving, there's basically a yellow sign with a picture of an airplane and an arrow pointing up, and you're like "what the fuck did that mean?" And then suddenly you understand exactly what it meant because you're driving on a fucking runway...

As in, "give way to aircraft from above" :D

Sweden had/has roads onthe middle of nowhere/forest that has more free space on the sides and at each end of particularly strate and flat stretches, there are oversized parking spots. Supposedly so fighter planes could refuse and rearm from mobile crews

Finland has plenty of those too. Here's a video of an F-18 doing a landing and takeoff from such a stretch of road during some exercise:

https://www.youtube.com/watch?v=Vj_eJxy8ojk

The ones I've been on weren't signposted at all. You're just on a road, and suddenly the road is completely straight and very wide, and 3km later it's back to normal, and there's nothing visible nearby.

I googled and found a list on https://www.mil-airfields.de/se/list.htm but IIRC there must be something further northwest, not on the list.

The Czech one is more of a Warsaw-Pact-level shit. :-) Here is a (originally secret) documentary video about MiG-21 exercise on the highway (in Czech, obviously): https://www.youtube.com/watch?v=FDoZGoaG9_w

Wrong spot, I'm pretty sure youre thinking of Vyškov https://www.google.com/maps/@49.2936699,17.0223332,1311m/dat...

And I'm absolutely sure I wasn't: two different spots, both near military airbases, this one is somewhat longer than the Vyškov one. Personally drove on both of them, many times. Can't find an English source though: https://cs.wikipedia.org/wiki/Leti%C5%A1t%C4%9B_M%C4%9B%C5%9...

Hmmm is that the one with the windmill rest stop thingy nearby?

Not aware of a windmill. The one I originally referenced has a McDonalds these days :D