Tunnels and Viaducts on the D11 Motorway in Italy, by Kilometre Point

• 25entries listed
• 2.07 kmlongest bore
• 9.15 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 1.7 km, which is the part of the table that changes when a single scheme opens. Where one of these 25 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 44 m and not a rounded figure. The longest entry is 47.0 times the shortest and 9.0 times the median, which is the quickest measure of how uneven the table is.

23 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction lucca column, the 26 values run from 44 to 2 066 with a midpoint at 230; the spread rather than the maximum is what says how uneven this set is.

This page records the structures catalogued along the D11 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 8 distinct places and structures — Aurelia, Toscana and Genova-S among them — and those names are the index into the length tables where each is recorded with its own figure.

The route table lists 25 structures with a recorded length, giving both carriageways where the two bores differ. The material on this page is held in 3 captions rather than in running text, 25 words of it, each written against the image or row it belongs to by the compiler who put the page together.

Reading the figures

A new scheme in Italy would have to beat 2.07 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Botteghino at 0.42 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

On 8 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 2 exits, 3 motorway connections, 1 toll barriers and 1 service areas along the route, in running order rather than by size.

Monte Quiesa at 1.24 km and Bozzano I at 0.61 km follow it, and lengths are given per carriageway because the two bores of a dual route are rarely cut to the same length. Comparing two national lists says as much about how each country records its infrastructure as about the infrastructure itself.

The note column places the route in Toscana, and the administrative area is recorded because a section is identified by it. Read down the direction viareggio column, the 26 values run from 35 to 2 066 with a midpoint at 255; the spread rather than the maximum is what says how uneven this set is.

The next two longest are Monte Quiesa at 1.12 km and Bozzano I at 0.61 km. The table on this page runs to 27 rows and records Tunnel / Viaduct, Direction Lucca, Direction Viareggio and Notes for each of them, which is the shape the original compiler chose rather than one imposed here.