Tunnels and Viaducts on the A07 Motorway in Italy, by Kilometre Point

• 61entries listed
• 1.78 kmlongest bore
• 18.44 kmtotal length

The record table

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

How this table is compiled

58 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Gabbia at 1.16 km and Boccardo at 1.06 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 78 entries are grouped on the page under 15 headings — exit busalla (28), exit vignole borbera - arquata scrivia (14), connection a12 livorno (10), exit isola del cantone (7) and exit ronco scrivia (3) — a classification the table carries as section breaks rather than as a column of its own.

Between the longest and the tenth-longest the drop is 1.27 km, which is the part of the table that changes when a single scheme opens. Where one of these 61 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 A07 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 16 distinct places and structures — Bolzaneto, Prov and Pavia among them — and those names are the index into the length tables where each is recorded with its own figure.

The route table lists 61 structures with a recorded length, giving both carriageways where the two bores differ. The material on this page is held in 5 captions rather than in running text, 42 words of it, each written against the image or row it belongs to by the compiler who put the page together.

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 45 m and not a rounded figure. The longest entry is 39.5 times the shortest and 10.1 times the median, which is the quickest measure of how uneven the table is.

Also recorded here are Po at 0.85 km and Prodonno at 0.8 km. A tunnel list for Italy reads differently from a neighbouring country's: 0 of these 61 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.

A new scheme in Italy would have to beat 1.78 km to change the head of this table, and that is the figure worth rechecking when one opens. The twelfth longest, Montanesi at 0.38 km, sits close enough to its neighbours that which of them ranks higher depends on how each was measured.

The eighth longest is Monte Galletto at 0.61 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure. The ten longest average 0.9 km against 0.18 km for everything below them, and that ratio is the clearest thing this table says about the distribution.

On 13 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 18 exits, 6 motorway connections, 2 toll barriers and 2 service areas along the route, in running order rather than by size.