Tunnels and Viaducts on the SS36 Motorway in Italy, by Kilometre Point

• 73entries listed
• 4.8 kmlongest bore
• 53.8 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 11.46 km of the 53.8 km on this page, which is 21 per cent of the total from 3 of 72 rows. The shorter half of the table totals 4.86 km against 48.94 km for the longer half, from the same number of rows.

55 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction spluga column, the 61 values run from 14 to 34 293 with a midpoint at 287; the spread rather than the maximum is what says how uneven this set is.

Between the longest and the tenth-longest the drop is 2.78 km, which is the part of the table that changes when a single scheme opens. Where one of these 72 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.

This page records the structures catalogued along the SS36 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 36 distinct places and structures — Lecco, Exit and Civate among them — and those names are the index into the length tables where each is recorded with its own figure.

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 240.0 times the shortest and 16.1 times the median, which is the quickest measure of how uneven the table is.

Reading the figures

The eighth longest is Passo del Lupo at 2.11 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure. The route crosses 5 provinces, recorded in the note column by their vehicle-registration codes (CO, LC, MB, MI, SO), which is how the operator identifies a section.

Read down the direction milano column, the 36 values run from 17 to 32 305 with a midpoint at 786; the spread rather than the maximum is what says how uneven this set is. Rock temperature rises with depth, and on the deepest alpine crossings the working face has needed cooling before it needed lighting.

The material on this page is held in 19 captions rather than in running text, 203 words of it, each written against the image or row it belongs to by the compiler who put the page together. The kilometre point is recorded for each structure on the SS36, which is how the operator identifies it.

They are not uniform: the fullest runs to 22 words and the briefest to 6, and on a page of this kind the long ones are where the explanation lives — the caption carries what the picture cannot. A crossing whose two carriageways differ in length is recorded once per direction rather than once per crossing.

The table below lists 73 entries with a recorded length, each giving a name, a length in metres and, where documented, the year of opening. A new scheme in Italy would have to beat 4.8 km to change the head of this table, and that is the figure worth rechecking when one opens.