Assertion: marker's number | /r/HasProperty | the distance
Facets:
value: in kilometres
type: OTHER
value: to that town
type: LOCATION
value: to city
type: LOCATION
Source sentences:
text: They have a letter which indicates the town or city they are referring to, and a number, which is the distance in kilometres to that town or city.
text: The number is given without units but is the distance in kilometres from a designated datum location for the road.