Creation of a covered trench on a line of 295 m and width 22.60 m between piers. Demolition of the existing pedestrian underpass and technical duct; creation of a new transverse technical sheath. Realization of lateral collectors with creation of walls and casings; realization of overpasses. Extension of the collectors. Implementation of retaining devices on structures and concrete slides. Installation of the A480 Nord / RN87 ramp on two tracks and recovery of the retaining devices. Realization of rainwater drainage collectors; temporary and permanent pavements.

The works include:

- the creation of a covered trench on a straight line of 295 m and 22.60 m wide between piers, between the rondeau interchange and the course of the liberation;

- the demolition of the existing pedestrian underpass and technical sheath;

- the creation of a new transverse technical sheath under the raft of the covered trench;

- the creation of lateral manifolds to dissociate the flows, with the creation of walls and casings;

- the realization of overpasses to allow the crossing of these lateral lanes by the RD1075 (course of the liberation), and the rue Léon Fournier;

- the extension of the manifolds by interweaving routes to the Échirolles-Center diffuser;

- the creation of new metropolitan roads (restoration of RD6) on the surface of the covered trench;

- the creation of a left turn on the Rondeau interchange from the RD6 to the A480 South;

- the implementation of retaining devices on structures and concrete slides;

- the twinning of the A480 Nord / RN87 ramp and the recovery of the restraint systems on the crossing structure of the A480;

- the creation of rainwater drainage collectors;

- temporary and permanent pavements.