1. A method comprising: receiving, at a road network device, data indicative of a first plurality of road segments for a first vehicle; receiving, at the road network device, data indicative of a second plurality of road segments for a second vehicle; determining a first electronic horizon based on the first plurality of road segments; determining a second electronic horizon based on the second plurality of road segments; and generating a message indicative of an intersection of the first electronic horizon and the second electronic horizon.