Would you not want to create a super-relation to knit the various sub relations together into a single seamless 'Via Tiburtina Valeria'? At least had been reading about this concept and the proposal to not have more than 300 bits in a single base relation "to keep it maintainable.". Sure would like to be able to see the whole, similar to what has developed for the SS16 Adriatico, from way up north in Veneto to the very south eastern tip, a bit computation intense before it renders entirely, but it works.