A border crossing as an event hands it over: the drawn feature, plus the two country sections
it joins.
Remarks
The sections are looked up on the route the crossing belongs to, so they are the same objects
route.properties.sections.country holds rather than copies. They are absent only when the route
that carried them is no longer shown.
A border crossing as an event hands it over: the drawn feature, plus the two
countrysections it joins.