Emphasis is placed on the two roundabouts being the only at-grade junctions between Hull and Holyhead on a designated Trans-European Network route known as Euroroute 22.
Pwysleisir mai'r ddwy gylchfan dan sylw yw'r unig gyffyrdd un-lefel rhwng Hull a Chaergybi ar un o lwybrau dynodedig y Rhwydwaith Traws-Ewropeaidd, sef Euroroute 22.