A few years ago I and three of my closest friends all lived at number 15 in their respective road or street. I lived, and still do, at 15 Chaffinch Road, Beckenham. My closest male friend at that time lived in Christchurch, Dorset, at a number 15, and two other female friends lived at a number 15 in Penge and Sydenham in South East London.
Incidentally, in my childhood and adolescent years, from age 5 to age 27, I lived in a road that formed one half of a horseshoe. For the last 35 years I have also lived in a similar road that forms a half of a horseshoe.