If you are planning to drive to Bormio in February there is a one way tunnel some 33 miles from Bormio and has a one way system open as follows:-
The tunnel is 35euros or 42 CHF return
The Munt la Schera Tunnel is a single lane road tunnel located in the Swiss canton of Grisons. It connects the Engadin valley with Lago di Livigno, through Munt la Schera.
The tunnel is now open 24 hours a day. The tunnel is only wide enough for a single vehicle, and traffic moves in alternate directions controlled by traffic lights which change every fifteen minutes. The tunnel is subject to height and width maxima of 3.6 and 2.5 m respectively.
Opened for public transport in 1968, initially the tunnel was used to transport building materials for the construction of Punt dal Gall dam.