D road can also apply as a road designation under the Great Britain road numbering schemeThe A500 is a major primary A road in Staffordshire and Cheshire, England. It is dual carriageway for most of its length and connects Nantwich, junctions 16 and 15 of the M6 motorway with the city of Stoke-on-Trent. It is known locally as the D-Road (D is also the Roman numeral representing the number 500).