Tunnels and Viaducts on the A05 Motorway in Italy, by Kilometre Point

• 78entries listed
• 11.61 kmlongest bore
• 54.06 kmtotal length

The record table

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

How this table is compiled

The three longest entries alone account for 18.2 km of the 54.06 km on this page, which is 34 per cent of the total from 3 of 78 rows. 39 entries sit above the median and 39 at or below it, so the table is evenly weighted and not clustered at one end.

Between the longest and the tenth-longest the drop is 10.06 km, which is the part of the table that changes when a single scheme opens. Where one of these 78 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 route table lists 78 structures with a recorded length, giving both carriageways where the two bores differ. The table on this page runs to 94 rows and records Tunnel / Viaduct, Direction F border, Direction Torino and Notes for each of them, which is the shape the original compiler chose rather than one imposed here.

66 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction torino column, the 65 values run from 20 to 3 073 with a midpoint at 162; the spread rather than the maximum is what says how uneven this set is.

This page records the structures catalogued along the A05 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 22 distinct places and structures — Prov, Aosta and Morgex among them — and those names are the index into the length tables where each is recorded with its own figure.

Reading the figures

Lengths for Italy are recorded in metres which is how the operators publish them and why the shortest entry here reads as 20 m and not a rounded figure. The longest entry is 580.5 times the shortest and 51.7 times the median, which is the quickest measure of how uneven the table is.

A new scheme in Italy would have to beat 11.61 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Leverogne at 1.92 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Also recorded here are Villaret at 2.7 km and Arvier at 2.45 km. A tunnel list for Italy reads differently from a neighbouring country's: 5 of these 78 structures pass three kilometres, and the same journey time is bought with one long bore in one country and a dozen short ones in another.

On 35 of the structures here the two carriageways are not the same length, which is why the archive records each direction separately rather than one figure per crossing. The note column records 19 exits, 2 motorway connections, 2 toll barriers and 2 service areas along the route, in running order rather than by size.

Read down the direction f border column, the 65 values run from 20 to 11 611 with a midpoint at 182; the spread rather than the maximum is what says how uneven this set is. The deepest point of a subsea tunnel is a sump, and its pumps run for the life of the crossing.