Tunnels and Viaducts on the A06 Motorway in Italy, by Kilometre Point

• 177entries listed
• 2.67 kmlongest bore
• 48.35 kmtotal length

The record table

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

How this table is compiled

Between the longest and the tenth-longest the drop is 1.8 km, which is the part of the table that changes when a single scheme opens. Where one of these 177 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 28 m and not a rounded figure. The longest entry is 95.5 times the shortest and 18.7 times the median, which is the quickest measure of how uneven the table is.

This page records the structures catalogued along the A06 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 20 distinct places and structures — Exit, Marene and Liguria among them — and those names are the index into the length tables where each is recorded with its own figure.

The route table lists 177 structures with a recorded length, giving both carriageways where the two bores differ. The material on this page is held in 9 captions rather than in running text, 66 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 2.67 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Cevetta at 0.72 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Reading the figures

Generale Franco Romano at 2.66 km and Montezemolo at 1.88 km follow it, and lengths are given per carriageway because the two bores of a dual route are rarely cut to the same length. Ventilation type is recorded where known, because it constrains how long a bore can be built without intermediate shafts.

On 20 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 13 exits, 7 motorway connections, 2 toll barriers and 5 service areas along the route, in running order rather than by size.

The longest entry is Vallone Teccio, at 2.67 km. The 191 entries are grouped on the page under 14 headings — exit altare (82), exit millesimo - montezemolo (39), exit ceva (37), exit mondovì (10) and exit niella tanaro - vicoforte (5) — a classification the table carries as section breaks rather than as a column of its own.

The next two longest are Montezemolo at 1.88 km and Pesio at 1.1 km. A tunnel list for Italy reads differently from a neighbouring country's: 0 of these 177 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.

The longest stands 0.01 km clear of the next longest, which is the margin to watch when a new scheme is announced. Laid end to end the entries on this page would run 48.35 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.