Wikipedia
The Francilienne is a partial ring road around Île-de-France ( Paris' région), France, lying outside the A86.
The planned ring is approximately 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.
However the publication of the National Infrastructure Priority report 'Mobilité 21' in June 2013 has now pushed the completion of the western section back to beyond 2021 and possibly beyond 2030 as it is relegated to a low (2nd class) priority national infrastructure project (along with another €80 billion of road rail and river/port projects) and behind some €30 billion of high-priority (1st class) projects that are likely to be all that is constructed between 2017 and 2030 in France under currently projected budgetary constraints.
The south eastern portion of the Francilienne, the N104 between the A4 and A6, is severely congested and carries a high percentage of heavy goods vehicle (HGV) traffic. Some parts of the N104 are being upgraded to three lanes each way in the vicinity of the A4 . The French government has not yet designated any of the lanes as high-occupancy vehicle lanes, however.
The Francilienne is the third Paris ring road, enclosing the A86 super-périphérique, which in turn encloses the Périphérique.
Enclosing the Francilienne itself is the very large and incomplete Grand Contournement, the south-eastern portion of which has yet to be constructed.