Road Tunnels in Italy — Complete List by Length

• 85entries listed
• 12.9 kmlongest bore
• 1882–2021openings span
• 130.93 kmtotal length

The record table

How this archive measures: lengths, bores, dates and ordering

How this table is compiled

The entries sum to roughly 130.93 km of bore, an average of about 5.46 km each, though that average describes no actual row. Eighth on the list is Pretunnel Gran San Bernardo Sud at 6.15 km, which is where the table stops being about record holders and starts being about ordinary infrastructure.

The three longest entries alone account for 34.68 km of the 130.93 km on this page, which is 26 per cent of the total from 3 of 24 rows. 12 entries sit above the median and 12 at or below it, so the table is evenly weighted and not clustered at one end.

Where one of these 24 lengths disagrees with an operator's own figure for Italy, the table keeps the published value and notes the difference instead of averaging the two. The 24 rows for Italy are ordered by length, not by date, so the 2021 opening sits well down the table without being any less current.

9 of the 24 measured entries exceed five kilometres, and those are the ones that carry a full ventilation and escape regime. Laid end to end the entries on this page would run 130.93 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.

Dated entries run from 1882 to 2021, and the busiest decade is the 1990s with 18 recorded openings. The table on this page runs to 85 rows and records State, Tunnel, Length (m), Date of opening and Region for each of them, which is the shape the original compiler chose rather than one imposed here.

Reading the figures

A new scheme in Italy would have to beat 12.9 km to change the head of this table, and that is the figure worth rechecking when one opens. The longest entry is 4.2 times the shortest and 2.9 times the median, which is the quickest measure of how uneven the table is.

The dated entries carry 33 distinct opening years across 139 years, and the median opening year is 1999. The material on this page is held in 35 captions rather than in running text, 353 words of it, each written against the image or row it belongs to by the compiler who put the page together.

Roughly 25 of the dated entries opened in this century, which is a rough measure of how much of the network is recent. The captions name 33 distinct places and structures — Italy, Motorway and Ponente among them — and those names are the index into the length tables where each is recorded with its own figure.

The dated entries fall across 33 different years, which is a rough measure of whether this was a sustained programme or a handful of separate schemes. The tunnel column names 85 distinct entries on this page, Ciriegia - Mercantour and Valico (Lavarone) among them, each traceable to the operator or administration record it was taken from.

The ten longest average 7.96 km against 3.66 km for everything below them, and that ratio is the clearest thing this table says about the distribution. The state column sorts these 85 rows into 5 groups, the largest being I with 79, then I - F with 3 and I å–F with 1.