Did you familiarize yourself with Icelandic road signs before driving in Iceland?

It seems many did not. I routinely see rental cars (if you know you know) turn the wrong way into a one-way street in downtown Reykjavik, with the driver seemingly having no clue what this sign means.

https://preview.redd.it/obqmuj25i0pf1.png?width=866&format=png&auto=webp&s=d94b1b6540b4d71d2f9bd61a7322aba7efe82b95

Picture borrowed from here: https://www.heyiceland.is/blog/nanar/7332/a-guide-to-the-road-signs-in-iceland