Tunnels and Viaducts on the A16 Motorway in Italy, by Kilometre Point

• 49entries listed
• 0.95 kmlongest bore
• 12.23 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 2.69 km of the 12.23 km on this page, which is 22 per cent of the total from 3 of 49 rows. The shorter half of the table totals 3.21 km against 9.01 km for the longer half, from the same number of rows.

The route table lists 49 structures with a recorded length, giving both carriageways where the two bores differ. The table on this page runs to 69 rows and records Tunnel / Viaduct, Direction Canosa, Direction Napoli, Notes and km for each of them, which is the shape the original compiler chose rather than one imposed here.

Between the longest and the tenth-longest the drop is 0.62 km, which is the part of the table that changes when a single scheme opens. Where one of these 49 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 97 m and not a rounded figure. The longest entry is 9.8 times the shortest and 5.3 times the median, which is the quickest measure of how uneven the table is.

This page records the structures catalogued along the A16 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 10 distinct places and structures — Connection, Avellino and RA02 among them — and those names are the index into the length tables where each is recorded with its own figure.

Reading the figures

The eighth longest is Bosco Grande at 0.38 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure. The ten longest average 0.55 km against 0.17 km for everything below them, and that ratio is the clearest thing this table says about the distribution.

Also recorded here are Mirabella at 0.43 km and Acqualonga at 0.42 km. A tunnel list for Italy reads differently from a neighbouring country's: 0 of these 49 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 material on this page is held in 3 captions rather than in running text, 19 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 A16, which is how the operator identifies it.

Laid end to end the entries on this page would run 12.23 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued. Tunnels built for one purpose are regularly repurposed for another, and a disused rail bore is the commonest cycleway in some countries.

The longest entry is Montemiletto, at 0.95 km. The 69 entries are grouped on the page under 4 headings — connection a30 caserta (60), exit candela (5), reg. campania – prov. na (2) and toll station napoli est (1) — a classification the table carries as section breaks rather than as a column of its own.