When any city, borough, town or township has regularly approved and adopted any map or plan that shows any street, road, or highway intended to lead into any adjacent city, borough, town or township, such city, borough, town or township shall send to the adjacent political subdivision notice of the proposed street, road, or highway accompanied by an exact copy of the maps or plans showing the location of the proposed route.

The adjacent political subdivision shall likewise be notified of any proposed changes of location of existing streets, roads, or highways leading into them.