Inaugurated on 15th July 2009, it represents the most important roadway axis among the works planned for the Garibaldi-Repubblica Integrated Intervention Program. It includes the covered crossing of the area between the crossroads of via Melchiorre Gioia on the east side and the Garibaldi station on the west side, and provides access to all the underground car parks of the new Garibaldi-Repubblica complex.
The coverage makes it possible to freely organize surface connections with limited traffic, the public garden, footways and, at the same time, to perform the functions of a motor vehicle link at the level of the current road system. The tunnel therefore indicates the point of access to the new complex.
The work extends over 450 m (of which 285 m covered) with approx. 25 m maximum width; it has a double carriageway with 2 lanes for each driving direction. The expected traffic volume during rush hours (8-9 a.m.) is approx. 1700 vehicles/hour from East to West and 1850 vehicles/hour in the opposite direction.
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The tunnel is characterized by valuable details (materials and finishing) aimed at improving the quality standard and technological level of the work; the design considers the problems related to the location of services, the equipment of lighting systems, traffic control and environmental safety. It also boasts high-level technological performances in terms of safety, air quality, sound insulation and systems and installations.
A number of technological systems have been implemented for detection of air quality, vehicle counting, vehicle speed, fixed and variable-message traffic signs, timed and interconnected traffic lights and for signal repetition for mobile phones.
Ventilation under the tunnel is natural in ordinary conditions; when the predefined pollution thresholds are exceeded, a powerful mechanical ventilation system is activated, consisting of axial accelerators (longitudinal forced aeration).
The tunnel lining is made of highly sound-absorbing panels consisting of elements of aluminum perforated sheet.
The work is one of the first national experiences in terms of use of photocatalytic treatments for the removal of pollutants both from the pavement and from the panels on the walls: photocatalysis is activated by a number of built-in UV lamps.
The intervention develops for 450 m (of which 285 m covered) with a maximum width of 25 meters, presenting a double carriageway with 2 lanes for each direction. The expected traffic volume for the rush hour (8-9 a.m.) is about 1700 vehicles/hour from east to west and 1850 vehicles/hour in the opposite direction.
