Tunnels and Viaducts on the A01 Motorway in Italy, by Kilometre Point

• 198entries listed
• 2.42 kmlongest bore
• 60.78 kmtotal length

The record table

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

How this table is compiled

The 250 entries are grouped on the page under 46 headings — exit rioveggio (37), exit barberino del mugello (26), appennine pass, height: 726 m (22), connection a1var – variante di valico (11) and exit val d'arno (11) — a classification the table carries as section breaks rather than as a column of its own.

Lengths for Italy are recorded in metres which is how the operators publish them and why the shortest entry here reads as 31 m and not a rounded figure. The longest entry is 78.0 times the shortest and 12.1 times the median, which is the quickest measure of how uneven the table is.

188 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction napoli column, the 189 values run from 31 to 2 418 with a midpoint at 200; the spread rather than the maximum is what says how uneven this set is.

The route table lists 198 structures with a recorded length, giving both carriageways where the two bores differ. The material on this page is held in 40 captions rather than in running text, 360 words of it, each written against the image or row it belongs to by the compiler who put the page together.

This page records the structures catalogued along the A01 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 49 distinct places and structures — Provincial, Roma and Connection among them — and those names are the index into the length tables where each is recorded with its own figure.

Reading the figures

A new scheme in Italy would have to beat 2.42 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Vado at 1.13 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Also recorded here are Puliana at 1.31 km and Banzole at 1.22 km. A tunnel list for Italy reads differently from a neighbouring country's: 0 of these 198 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.

Laid end to end the entries on this page would run 60.78 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued. The note column places the route in Lombardia, Lombardy, and the administrative area is recorded because a section is identified by it.

On 51 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 65 exits, 28 motorway connections, 2 toll barriers and 8 service areas along the route, in running order rather than by size.

The table on this page runs to 250 rows and records Tunnel / Viaduct, Direction Napoli, Direction Milano and Notes for each of them, which is the shape the original compiler chose rather than one imposed here. Environmental consent now takes longer than construction on many schemes, and the dates in a list rarely show it.