Edge is a type of Person. Person wants (to) Electricity. 
Highway is related to Route. Route is related to Course. Course is related to Obstacle. Obstacle is related to Hazard. 
Edge --IsA--> Person --Desires--> Electricity 
Highway <--RelatedTo--> Route <--RelatedTo--> Course <--RelatedTo--> Obstacle <--RelatedTo--> Hazard 