Why not extend the C1 Cable to the RER D in Villeneuve-Saint-Georges?

At this stage, such an extension has been ruled out because the studies carried out have shown that it would imply very significant impacts on the urban environment. To reach the RER D in Villeneuve-Saint-Georges, you can take bus 427 (e.g. J1 and J2) which will serve the stations of the C1 La Végétale cable in Limeil-Brévannes and Villa Nova in Villeneuve-Saint-Georges.