The 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 in the 8 - 16 km range. The south-western section of A86 contains one of the world's longest urban motorway tunnels (10 km of continuous tunnel) known as the Duplex A86, opened in two parts in 2009 and 2011. The tunnel is limited to a height of 2.0 m and commercial vehicles are prohibited as a result. Although now a complete motorway-standard loop, the A86 is a product of its heavily urban route and piecemeal construction, meaning that there are several points at which one has to turn off to stay on (TOTSO) and sections which are briefly parts of the A3 and A4 autoroutes. A86 is a part of the five-ring-road system surrounding Paris and Île-de-France:

Duplex A86

The Duplex A86 is a 10 km (6,2 mi) long motorway tunnel in Paris, which forms part of the A86. Unlike most tunnels, this one is a single tube, double deck tunnel. It opened in two stages: the northern section (Rueil-Malmaison - A13) opened in 26 June 2009 and the southern section (A13 - Vélizy-Villacoublay) in 9 January 2011. It was initially open between 06:00 and 22:00. From 1 September 2009, it became operational 24/7. Due to the nature of this tunnel, it has a height restriction of 2 m (6 ft 6 in) which precludes large vehicles using the tunnel and has a speed limit of 70 km/h (43 mph). Motorcycles and vehicles with dangerous goods are also not permitted.

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