Tunnels and Viaducts on the D29 Motorway in Italy

34 rows are rendered in total, so 10 of them carry a note or a blank where a length belongs and are shown without being counted. The middle half of the table runs from 0.14 km to 0.53 km, and that band is where most of the engineering on this page actually sits.

The median entry measures 0.32 km, so half the table sits below that and half above, which is a better guide to the typical structure here than the headline figure. The shortest recorded entry is 0.06 km against 2.38 km at the top, a spread of 39.05x across the same table.

The three longest entries alone account for 5.2 km of the 11.99 km on this page, which is 43 per cent of the total from 3 of 24 rows. 12 entries sit above the median and 12 at or below it, so the table is evenly weighted and not clustered at one end.

24entries listed
2.38 kmlongest bore
11.99 kmtotal length

The record table

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

Tunnels and Viaducts on the D29 Motorway in Italy, by Kilometre Point
Tunnel / Viaduct	Length direction Trapani	Length direction Alcamo	Notes	—
			Connection A29 Palermo – Mazara del Vallo / Reg. Sicily – Prov. TP	0.0
Trappatore	385 m	385 m
Gaggera	990 m	990 m
Viaduct	102 m	102 m
Della Signora	342 m	342 m
Caldo	2 382 m	2 382 m
Segesta	1 615 m	1 615 m		7.1
Fosso Tempio	31 m	31 m
			Exit Segesta	8.7
Della Fonte	61 m	61 m
Gaggera II	346 m	346 m
Fastaia I	201 m	201 m
Fastaia II	267 m	267 m
SS113	65 m	65 m
Fastaia III	296 m	296 m
Zena	370 m	370 m
Viaduct	1 200 m	1 200 m
			Exit Fulgatore	20.6
Fittasi	362 m	362 m
Canalotti I	102 m	102 m
Canalotti II	206 m	206 m
Canalotti III	137 m	137 m
Fumosa	460 m	460 m		25.1
Fumosa	550 m	550 m
Sergio	142 m	142 m
			Exit Dattilo	29.2
			Connection A29dirA Dattilo- Birgi Airport	30.6
Soria	134 m	134 m
Serro	236 m	236 m
Lenzi	1 041 m	1 041 m
			Exit Trapani
			Exit Marsala	36.0
			Exit Marausa	41.7
			Exit Birgi Airport	43.7
TOTAL, tunnels	2194	2181

How this table is compiled

Between the longest and the tenth-longest the drop is 2.02 km, which is the part of the table that changes when a single scheme opens. Where one of these 24 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 61 m and not a rounded figure. The longest entry is 39.0 times the shortest and 7.5 times the median, which is the quickest measure of how uneven the table is.

A new scheme in Italy would have to beat 2.38 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Zena at 0.37 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Also recorded here are Fumosa at 0.55 km and Fumosa at 0.46 km. A tunnel list for Italy reads differently from a neighbouring country's: 0 of these 24 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 11.99 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued. A canal tunnel is sized by the boat, not by the traffic, which is why the oldest of them are so narrow.

Reading the figures

The table on this page runs to 34 rows and records Tunnel / Viaduct, Length direction Trapani, Length direction Alcamo and Notes for each of them, which is the shape the original compiler chose rather than one imposed here. Tunnel building in Italy is shaped by geology and settlement pattern as much as by transport policy.

The next two longest are Segesta at 1.62 km and Lenzi at 1.04 km. Read down the length direction trapani column, the 26 values run from 31 m to 2 382 m with a midpoint at 319 m; the spread rather than the maximum is what says how uneven this set is.

The ten longest average 0.94 km against 0.19 km for everything below them, and that ratio is the clearest thing this table says about the distribution. The tunnel / viaduct column names 24 distinct entries on this page, Trappatore and Gaggera among them, each traceable to the operator or administration record it was taken from.

Read down the length direction alcamo column, the 26 values run from 31 m to 2 382 m with a midpoint at 319 m; the spread rather than the maximum is what says how uneven this set is. The kilometre point is recorded for each structure on the D29, which is how the operator identifies it.

The table below lists 24 entries with a recorded length, each giving a name, a length in metres and, where documented, the year of opening. The entries sum to roughly 11.99 km of bore, an average of about 0.5 km each, though that average describes no actual row.

Questions about Italy

What is the longest structure in Italy?

On the figures recorded here it is Caldo, at 2.38 km. It is the longest of the 24 entries recorded here, measured by bore length rather than span, cost or construction difficulty.

How many structures are listed for Italy?

24 entries with a recorded length appear on this page, from 0.06 km at the short end to 2.38 km at the top, with the middle of the set around 0.32 km. The table renders 34 rows in total; the rest carry a note or a blank where a length belongs.

What is a typical length among the structures listed for Italy?

The median entry measures 0.32 km and the middle half of the table runs from 0.14 km to 0.53 km. The headline figure of 2.38 km is the outlier, not the norm, which is why the median is the more useful number when comparing one national list against another.

How close is the top of the Italy table?

The longest stands 0.77 km clear of the next entry, and nothing else comes within ten per cent of it. A newly announced scheme therefore has to beat 2.38 km to displace Caldo.

What else does the D29 table record besides structures?

The note column follows the route in running order and records 7 exits and 2 motorway connections. The note column places the route in 1 province (TP). Junctions are listed at their kilometre point, which is how a section is identified in the field.

Other pages in this section

Cite this page

Tunnels and Viaducts on the D29 Motorway in Italy, by Kilometre Point. The World's Longest Tunnels. https://www.lotsberg.net/data/italia/D29.html

Tunnels and Viaducts on the D29 Motorway in Italy, by Kilometre Point