Understanding is a synonym of Sympathy. Sympathy is related to Comfort. Comfort is a synonym of Relief. 
Traffic is related to Street. Street is a type of Neighborhood. you are likely to find Driveway in/at/on Neighborhood. 
Understanding <--Synonym--> Sympathy <--RelatedTo--> Comfort <--Synonym--> Relief 
Traffic <--RelatedTo--> Street --IsA--> Neighborhood <--AtLocation-- Driveway 