1. A method for using a connected network built on the basis of reachability of a plurality of road segments in a road network, the method comprising: identifying an event in the connected network; forming a road segment set influenced by the event on the basis of the connected network by identifying each road segment in the plurality of road segments from which a location of the event is reachable via the road network from that road segment and which is within a predefined influence range from the location of the event; generating a query index on the basis of the event and the road segment set; forming a geo-fence around a perimeter of the predefined influence range such that a notification of the event is transmittable to a plurality of vehicles located within the geo-fence; detecting, based on GPS data about the plurality of vehicles, a location of each vehicle of the plurality of vehicles within the geo-fence; determining, based on the query index and the location of each vehicle of the plurality of vehicles, that each vehicle of a first vehicle set of the plurality of vehicles is on a road segment in the road segment set and that each vehicle of a second vehicle set of the plurality of vehicles is not on a road segment in the road segment set; and notifying, based on the determining, each vehicle of the first vehicle set of the event without notifying the vehicles of the second vehicle set of the event.