So, I've called the Roads departement to have some details about the works on the track.
First at the tertre rouge curve the track is widened inside but because of the tires along the outside barriers , the track axis would move inside for around 1,20 m.
Then about the works from Mulsanne to the porsche curve, yes the grass would have to be replaced by tarmac but now it is not possible to know exactly how. The works surely will start after the race probably late in the year, but actually the project is not totally finalized.
Otherwise, Timing control systems have been buried at some places along the track Hunaudières, Mulsanne, from Arnage to the porsche curve.
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