Roll is a type of Rock. you are likely to find Bug in/at/on Rock. 
Traffic is related to Green. Green is a synonym of Park. Park is related to Wilderness. Wilderness is related to Nature. 
Roll --IsA--> Rock <--AtLocation-- Bug 
Traffic <--RelatedTo--> Green <--Synonym--> Park <--RelatedTo--> Wilderness <--RelatedTo--> Nature 