Tunnels and Viaducts on the A34 Motorway in Italy, by Kilometre Point

• 8entries listed
• 0.36 kmlongest bore
• 1.04 kmtotal length

The record table

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

How this table is compiled

The entries sum to roughly 1.04 km of bore, an average of about 0.13 km each, though that average describes no actual row. The tunnel / viaduct column names 8 distinct entries on this page, Villesse and S.R.252 among them, each traceable to the operator or administration record it was taken from.

Between the longest and the tenth-longest the drop is 0.32 km, which is the part of the table that changes when a single scheme opens. Where one of these 8 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 40 m and not a rounded figure. The longest entry is 8.9 times the shortest and 4.7 times the median, which is the quickest measure of how uneven the table is.

This page records the structures catalogued along the A34 in Italy, in a tunnel almanac maintained at this address since the late 1990s. Laid end to end the entries on this page would run 1.04 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.

The route table lists 8 structures with a recorded length, giving both carriageways where the two bores differ. The table on this page runs to 13 rows and records Tunnel / Viaduct, Direction Slovenia, Direction Villesse and Notes for each of them, which is the shape the original compiler chose rather than one imposed here.

Reading the figures

The next two longest are Villesse at 0.22 km and Savogna/Sovodnje at 0.18 km. The 13 entries are grouped on the page under 3 headings — exit gradisca d'isonzo (7), toll barrier villesse-gorizia (5) and exit gorizia (1) — a classification the table carries as section breaks rather than as a column of its own.

The longest stands 0.14 km clear of the next longest, which is the margin to watch when a new scheme is announced. Read down the direction slovenia column, the 8 values run from 40 to 355 with a midpoint at 75; the spread rather than the maximum is what says how uneven this set is.

8 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Villesse at 0.22 km and Savogna/Sovodnje at 0.18 km follow it, and lengths are given per carriageway because the two bores of a dual route are rarely cut to the same length.

A new scheme in Italy would have to beat 0.36 km to change the head of this table, and that is the figure worth rechecking when one opens. 2 of the 8 entries fall within a quarter of the median length, which is how tightly this particular list clusters around its typical structure.

The eighth longest is S.R.252 at 0.04 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure. 8 of them are under 500 metres, which on a route of this kind usually means a cut-and-cover section or a short spur and not a driven bore.