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Il raddoppio del tunnel autostradale del San Gottardo sul lungo termine costa di più rispetto ad un'autostrada viaggiante. Sono questi i risultati di uno studio commissionato dall'Ufficio federale delle strade (USTRA) che ha analizzato le due varianti fino all'anno 2090.
Per i calcoli gli esperti dello studio Helbling incaricati dall'USTRA hanno fatto
riferimento alle cifre del Consiglio federale. Secondo questi dati, la costruzione di una seconda canna costerebbe circa 2,8 miliardi di franchi. Una semplice ristrutturazione con costituzione di un'autostrada viaggiante (trasferimento su rotaia) verrebbe invece a costare 1,7 miliardi.
Gli esperti hanno calcolato poi gestione e ristrutturazioni di entrambe le varianti fino al 2090. Sul lungo termine la seconda canna costerebbe 5 miliardi, contro i 3,6 miliardi dell'autostrada viaggiante. Tuttavia, il Consiglio federale nelle sue valutazioni non ha ragionato in cifre assolute, ma in proporzione, ha spiegato il Dipartimento federale dei trasporti (DATEC) all'ATS. Con questo sistema, le differenze di costo diminuiscono col tempo.
La scorsa settimana il Consiglio degli Stati ha iniziato il dibattito sul tema. Dopo una discussione durata oltre quattro ore, i senatori hanno deciso l’entrata in materia ma rinviato ai prossimi giorni la discussione di merito.
Red. MM/ATS
Il progetto di Berna
La galleria autostradale del San Gottardo, lunga 16,9 chilometri, è stata inaugurata il 5 settembre 1980. Tra il 2020 e il 2025, a circa quarant'anni dalla sua apertura al traffico, avrà bisogno di importanti lavori di risanamento che comporteranno una chiusura al traffico del traforo per almeno due anni e mezzo. Per scongiurare una lunga interruzione del collegamento nord-sud, il Governo ha proposto al Parlamento una modifica della Legge federale concernente il transito stradale nella regione alpina che prevede la costruzione della seconda canna e il risanamento di quella attuale. Per l'Esecutivo, questa variante va realizzata senza ampliamento delle capacità. L'ultima parola dovrebbe spettare al popolo: un referendum appare infatti certo.
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