Tunnels and Viaducts on the A10 Motorway in Italy, by Kilometre Point

• 278entries listed
• 1.85 kmlongest bore
• 96.51 kmtotal length

The record table

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

How this table is compiled

The route table lists 278 structures with a recorded length, giving both carriageways where the two bores differ. The table on this page runs to 313 rows and records Tunnel / Viaduct, Direction France, Direction Genova, Notes and km for each of them, which is the shape the original compiler chose rather than one imposed here.

268 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction france column, the 247 values run from 15 to 50 227 with a midpoint at 273; the spread rather than the maximum is what says how uneven this set is.

Between the longest and the tenth-longest the drop is 0.83 km, which is the part of the table that changes when a single scheme opens. Where one of these 278 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 A10 in Italy, in a tunnel almanac maintained at this address since the late 1990s. The captions name 23 distinct places and structures — Area, Milano and Region among them — and those names are the index into the length tables where each is recorded with its own figure.

Lengths for Italy are recorded in metres which is how the operators publish them and why the shortest entry here reads as 36 m and not a rounded figure. The longest entry is 51.4 times the shortest and 7.0 times the median, which is the quickest measure of how uneven the table is.

Reading the figures

A new scheme in Italy would have to beat 1.85 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Polcevera at 1.1 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

The shorter half of the table totals 22.18 km against 74.33 km for the longer half, from the same number of rows. Only 80 of the 313 rows carry anything in the km column, so that field describes a minority of this table and the rest of the rows are recorded without it.

On 113 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 22 exits, 3 motorway connections, 1 toll barriers and 8 service areas along the route, in running order rather than by size.

The material on this page is held in 6 captions rather than in running text, 60 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 A10, which is how the operator identifies it.

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 96.51 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.