I'd say the most common rule across Europe would be "you can cross anywhere as long as you're not within X meters of a crosswalk". As in if there is one within

I'd say the most common rule across Europe would be "you can cross anywhere as long as you're not within X meters of a crosswalk". As in if there is one within your line of sight, it's there for a reason and you should use it. If there isn't one, cross away.