My kids always enjoy going between the states or cities when one sign says you are leaving the state or city and there is a big gap before the next state or city has a sign saying welcome to their state or city. My kids refer to this as the black border line on the map.
The black line on the map between Arden Hills and New Brighton is the highway and I can't hide a cache on the bridge. But, this is between the city signs which should count for something!