Tunnels and Viaducts on the A32 Motorway in Italy, by Kilometre Point

• 54entries listed
• 12.9 kmlongest bore
• 49.17 kmtotal length

The record table

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

How this table is compiled

44 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Cels at 5.24 km and Prapontin at 4.41 km follow it, and lengths are given per carriageway because the two bores of a dual route are rarely cut to the same length.

The three longest entries alone account for 22.54 km of the 49.17 km on this page, which is 46 per cent of the total from 3 of 54 rows. 27 entries sit above the median and 27 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 11.84 km, which is the part of the table that changes when a single scheme opens. Where one of these 54 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.

Lengths for Italy are recorded in metres which is how the operators publish them and why the shortest entry here reads as 41 m and not a rounded figure. The longest entry is 314.5 times the shortest and 31.1 times the median, which is the quickest measure of how uneven the table is.

This page records the structures catalogued along the A32 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 11 distinct places and structures — Autoporto, Prov and Tangenziale among them — and those names are the index into the length tables where each is recorded with its own figure.

Reading the figures

The route table lists 54 structures with a recorded length, giving both carriageways where the two bores differ. The material on this page is held in 3 captions rather than in running text, 25 words of it, each written against the image or row it belongs to by the compiler who put the page together.

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 eighth longest is Borgone at 1.08 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

On 18 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 16 exits, 1 motorway connections, 3 toll barriers and 3 service areas along the route, in running order rather than by size.

The note column places the route in Piemont, and the administrative area is recorded because a section is identified by it. Read down the direction frejus column, the 52 values run from 41 to 17 336 with a midpoint at 415; the spread rather than the maximum is what says how uneven this set is.

Read down the direction torino column, the 52 values run from 41 to 16 940 with a midpoint at 415; the spread rather than the maximum is what says how uneven this set is. Switzerland's crossings are alpine and its practice is conservative, which shows in how few of its entries have ever been rebuilt.