> They fly according to GPS coordinates, along routes certified free of trees, buildings, and other impediments.

> The routes are surveyed and reviewed constantly to avoid new construction. To further decrease the risk, the drones are directed over water and unpopulated industrial areas as much as possible.

I don't know how much Reykjavík increases each year, but given a population of around 125k persons, probably there isn't a boom in skyscrapers.