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Description of the project

As part of the planned expansion of the motorway between Sasso Marconi and Incisa Valdarno, and in particular the “Barberino di Mugello – Incisa Valdarno” section, which represents the most complicated Apennine section due to its topography and the environmental vulnerability of the area just to the north of Florence, the existing carriageways are due to be upgraded. This will involve transforming the former southbound carriageway into a northbound carriageway and modernising the existing northbound section.

Following the opening to traffic of the new southbound carriageway on 19 March 2022, the upgrade marks the completion of the entire Barberino-Florence North section.

The aim is to modernise the entire section and bring it into line with current technical and safety standards. The following is a list of the main interventions:

• Road surface maintenance, the complete replacement of draining pavement and restoration work on certain stretches of the motorway;
• The complete replacement of safety barriers along the entire stretch with the latest forms of barrier;
• Implementation of the noise abatement plan in accordance with the requirements established following the EIA;
• Rationalisation of the hydraulic engineering works to partially close the water collection and disposal system;
• Artificial extension on the south side of the Colle tunnel;
• New horizontal and vertical signage, primarily regarding the re-direction of the former of southbound carriageway and to manage the points where the two carriageways separate and merge;
• Update of the PD alle NTC 2018 and the latest procedures issued by the Grantor (primarily FOA, Integautos barriers, walls and kerbing);
• Update of the PD relating to tunnel equipment in light of the work provided for in Tunnel Safety Plan 1 (concluded) and Tunnel Safety Plan 2 (in progress).

Works under way:

Works began in July 2024. The entire northern carriageway (approximately 10 km) was closed off to safely perform the interventions required on the former southern carriageway. Line northbound rerouting works are currently under way.

Goccioloni I viaduct - Goccioloni II - Torraccia

The upgrade of the Goccioloni viaduct, Goccioloni II and Torraccia forms part of a more general widening to three lanes of the Barberino di Mugello - Florence North section, where the new southbound carriageway has already been completed.

All three viaducts share similar characteristics, with two carriageways on separate decks. Works are currently underway on the former southbound carriageway, with traffic being restricted to the northbound carriageway only.

Work in progress

The work envisages the following:

• Replacement of the existing prestressed reinforced concrete with a steel beam and composite slab deck;
• Demolition and reconstruction of the pier caps, necessary in order to install a new deck that can handle current load conditions;
• Reinforcement and restoration of the piers and coupling beams, through reprofiling and the addition of a steel jacket with added reinforcement;
• Reinforcement and restoration of the end abutments;
• Reinforcement and restoration of the foundation plinths.

The decks on the former southbound carriageway were demolished with explosives, and traffic on the northbound carriageway was closed off.

Once the former southbound carriageway viaducts will be reconstructed, traffic will be diverted on the new carriageway whilst the existing carriageway is being updated. Upon the project’s completion, there will be 4 northbound lanes, in addition to the current 3 southbound lanes.

To date, the N2 carriageway (former southbound carriageway) of the Torracia viaduct has been completed and tested, the Viadotto Goccioloni I deck has been completed, and the Viadotto Goccioloni II steel beams have been installed.