Triangle of Rocquencourt

The triangle of Rocquencourt is famous a exchanging highway French department of the Yvelines. Its reputation comes to him from what it was, in 1950, the first of this type built in France.

This exchanger allows the communication between the Autoroute of Normandy (A13) which connects Paris to Rouen and Caen and the highway A12 which, while starting at this place, carries out towards the south to Trappes and its prolongation, the Trunk road 10 towards south-west like with the Trunk road 12 towards the ouest.
It is the very light inflection towards the North-West of a13 highway which accentuates the triangular form of the work.

It has, however, wrongly thus called because almost the totality of the work is on the communal territory of Bailly.
The amalgam was made with the access to a13 highway starting from the Trunk road 186. Access which is at approximately 500 meters of the end is exchanger and is indeed on the commune of Rocquencourt.

The exchanger is entirely in the Forêt of Marly, that 13 cross-piece in all its length has and that it contributed to deforest a little more. Between the various ways of the highways, wild boars and roe-deers gîtent in glazing bar, accessible from the forest of Marly by tunnels.

Its celebrity also comes from what it constitutes, at the time of the great returns on Paris and the morning in week at the rush hours, a chronic point of congestion of circulation, sometimes qualified of “larger stopper of Europe”. At the time of the departures in weekends of the “Parisian ” about the Normandy, Friday afternoon and, a fortiori, at the beautiful season, the exchanger is also found crammed. Generally, the congestions do not come from the exchanger in itself but from cloggings downstream, the three ways of a13 highway in direction of Paris as well as the two ways in direction of Poissy being insufficient to absorb the excessive quantity of vehicles.

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