Dual Carriageway Ends Post Mounted Sign - Dia 520 R2/RA2 (Face Only)The dual carriageway ends sign (diagram 520) means that the section of dual carriageway is coming to an end and normal two way traffic will resume. The diagram resembles the "Road Narrows on Both Sides" sign, however, this can be told apart as both lines join together to represent the two lanes joining into one. The Dual Carriageway sign is sometimes called the 'End of Dual Motorway' sign but is only used on carriageways. The sign warns drivers that