Tunnels and Viaducts on the A30 Motorway in Italy, by Kilometre Point

• 7entries listed
• 2.91 kmlongest bore
• 5.82 kmtotal length

The record table

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

How this table is compiled

The route table lists 7 structures with a recorded length, giving both carriageways where the two bores differ. The table on this page runs to 19 rows and records Tunnel / Viaduct, Direction Fisciano, Direction Caserta, Notes and km for each of them, which is the shape the original compiler chose rather than one imposed here.

The median entry measures 0.57 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 0.09 km against 2.91 km at the top, a spread of 30.98x across the same table.

Between the longest and the tenth-longest the drop is 2.82 km, which is the part of the table that changes when a single scheme opens. Where one of these 7 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 94 m and not a rounded figure. The longest entry is 31.0 times the shortest and 5.1 times the median, which is the quickest measure of how uneven the table is.

The note column records 6 exits, 4 motorway connections and 1 toll barriers along the route, in running order rather than by size. Only 11 of the 19 rows carry anything in the direction fisciano column, so that field describes a minority of this table and the rest of the rows are recorded without it.

Reading the figures

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. The kilometre point is recorded for each structure on the A30, which is how the operator identifies it.

The entries sum to roughly 5.82 km of bore, an average of about 0.83 km each, though that average describes no actual row. A new scheme in Italy would have to beat 2.91 km to change the head of this table, and that is the figure worth rechecking when one opens.

The longest stands 2 km clear of the next longest, which is the margin to watch when a new scheme is announced. Only 11 of the 19 rows carry anything in the direction caserta column, so that field describes a minority of this table and the rest of the rows are recorded without it.

2 of the 7 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 Exit Castel San Giorgio at 0.4 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Only Sarno sits within ten per cent of the longest figure, so one structure stands 2 km clear of the field here. The captions name 9 distinct places and structures — Fisciano, Sarno and Salerno among them — and those names are the index into the length tables where each is recorded with its own figure.