...by which I mean that there are lots of numbers that are used for both an A road and a B road, and sometimes the identically numbered A road and the B road meet. * A105 - B105 Stoke Newington map * A1000 - B1000 Welwyn Garden City map * A300 - B300 Southwark map * A4289 - B4289 Swindon map * A5284 - B5284 Kendal map * A700 - B700 Edinburgh map * A701 - B701 Edinburgh map