I suspect these are much more common in cities, simply because they're more likely to have the kind of intersections where a fixed cycle makes sense. For exampl

I suspect these are much more common in cities, simply because they're more likely to have the kind of intersections where a fixed cycle makes sense. For example, if you have a crossing over a one way section of road, or if the crossing is busy enough that there will almost always be pedestrians waiting. Outside of cities, you often have less frequently used crossings over main roads, where a button controlled crossing makes much more sense than a fixed cycle.