The Francilienne (pronounced [fʁɑ̃siljɛn]) is a partial ring road around Île-de-France (Paris' région), France, lying outside the A86. The planned ring is approximately 50 km (31 mi) in diameter, similar in size to London's M25 motorway. Started in 1970, the existing segments cover about two-thirds of the circle, under different names (A104, N104, N184). Construction of the western sections, which would complete the Francilienne, was projected during the late 2000s to take place between 2011 and 2015. All future construction is to be to motorway standard and will be designated as A104 only.