a86

A86 (sometimes called "Paris super-périphérique") is the second ring road around Paris, France. It follows an irregular path around Paris with the distance from the city centre (Notre Dame) varying from 8–16 kilometres (5.0–9.9 mi). A section of A86 contains one of the world's longest urban motorway tunnels (10.1 km (6.3 mi) of continuous tunnel), opened in two parts in 2009 and 2011. The tunnel is limited to a height of 2.0 m (6 ft 7 in) and commercial vehicles are prohibited as a result.A86 is a part of the four-ring-road system surrounding Paris and Île-de-France:

Boulevard Périphérique, completed in 1973, roughly an ellipse 9 km × 11 km (5.6 mi × 6.8 mi) and limits of Paris city.
A86, completed in 2011, irregular, 20 km × 25 km (12 mi × 16 mi), similar in size with London's North Circular and South Circular.
The Francilienne, a partial ring, circa 50 km (31 mi) in diameter, comparable with London's M25 motorway.
The Grand contournement de Paris, a wide loop bypassing Paris.

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