Callouts including intersections on a different level

[davecraig]

The example I'm going to use here is where Douglas Street in Milngavie crosses Ellangowan Road as a bridge: https://maps.app.goo.gl/4hRJywKcu6Zb9ihP8

There's no intersection between the two roads, so we don't accidentally declare an intersection, but when walking on Douglas Street the callouts do see the nearby intersections where Ellangowan Road turns into a tunnel and back again. Calling them out is very confusing as they aren't intersections with the road which we are currently on. Perhaps the fix is only to callout intersections that include the road that we are currently though to be on (though that's possibly another can of worms - see #310)