Caught myself studying online guides to bollard color and shape by region, what road stripe patterns correspond with each country, the different shapes of the lettering of most major languages… etc.
It’s such a fun way to spend 15-30 minutes a day, and it’s quite easy to see improvement in your skill in a short time.
That being said, watching the pros can be a little discouraging because they’ll even have things like the ridge lines of mountain ranges memorized, it’s insane to watch.