The minimum width of 2.20 metres (7.2 ft) was originally intended to allow the transit of two mules with their baggage.

[4] Notable among the many tunnels is the 19th because, in addition to being the longest (320 metres (1,050 ft)), it has a helical layout with 4 hairpin bends, inside a gigantic rock tower.

[peacock prose]A masterpiece of military engineering and boldness (it was produced by the 33rd Miners Company of the Italian Army with the help of six hundred workers), considering the conditions and the time it was built, and the speed of execution.

Its implementation was of great strategic importance because it allowed communication and transfer of supplies from the base to the summit area of Mt.

These were all problems with the similar road of Scarubbi which is only accessible with motorized vehicles, within the range of the Austro-Hungarian guns, and only during the summer.