Road Tunnels in Singapore — Complete List by Length

• 10entries listed
• 3.7 kmlongest bore
• 2008–2012openings span
• 19.12 kmtotal length

The record table

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

How this table is compiled

Dated entries run from 2008 to 2012, and the busiest decade is the 2000s with 4 recorded openings. The table on this page runs to 10 rows and records Tunnel, Length (m), Date of opening, Notes and Road for each of them, which is the shape the original compiler chose rather than one imposed here.

Further down the table, Serangoon is recorded at 0.26 km and Bendemeer at 0.25 km. Read down the length (m) column, the 10 values run from 160 m to 3 700 m with a midpoint at 2 050 m; the spread rather than the maximum is what says how uneven this set is.

Where one of these 10 lengths disagrees with an operator's own figure for Singapore, the table keeps the published value and notes the difference instead of averaging the two. The 10 rows for Singapore are ordered by length, not by date, so the 2012 opening sits well down the table without being any less current.

Lengths for Singapore are recorded in metres which is how the operators publish them and why the shortest entry here reads as 160 m and not a rounded figure. The longest entry is 23.1 times the shortest and 1.8 times the median, which is the quickest measure of how uneven the table is.

A new scheme in Singapore would have to beat 3.7 km to change the head of this table, and that is the figure worth rechecking when one opens. The dated entries fall across 3 different years, which is a rough measure of whether this was a sustained programme or a handful of separate schemes.

Reading the figures

Dates for Singapore refer to opening to traffic, not breakthrough, so the 2008 entry was under construction for some years before that. Laid end to end the entries on this page would run 19.12 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.

The tunnel column names 10 distinct entries on this page, CTE II and PIE – Ubi rd 2 among them, each traceable to the operator or administration record it was taken from. The road column sorts these 10 rows into 3 groups, the largest being KPE with 4, then CTE with 3 and PIE with 3.

8 of the 10 rows carry an entry in the notes column — 80 per cent of the table — and that column is where the qualifications live: tube counts, closures, boundaries and the reason a figure reads the way it does. Subsea tunnels are usually built with a low point well below sea level and pumped continuously.

The table below lists 10 entries with a recorded length, each giving a name, a length in metres and, where documented, the year of opening. The date of opening column sorts these 8 rows into 3 groups, the largest being 19.09.2008 with 4, then 2011 with 3 and 2012 with 1.

The longest entry is CTE II, at 3.7 km, opened in 2012. A tunnel list for Singapore reads differently from a neighbouring country's: 2 of these 10 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.