Have agreed in previous comments that this was subjective (as a family but also as a driver) experience.

Maybe one thing that amplified the effect was the high expectations we had for those highways, and maybe that's what made it more shocking for us.

Again, I consider myself a 'decently skilled' driver, having driven in many countries over the course of the years, and easily adapting to driving styles (US/Italy/France/Iran/UK/India/etc). Some of these styles are indeed chaotic, but they (generally) operate at slower speed, which allow for corrections and precautions. The thing that threw us off is the combination I have mentioned before:

> [...] the speed that those roads allow. The style was quite aggressive, very fast in every lane, loads of overtakes (car constantly zig-zagging), people coming from the back _FAST_ and staying there, people switching lanes immediately after signalling rather than giving some time for people to notice. Overall, that combination made for a very stressful experience which we have agreed (as family) not to repeat in the future.