List of transport megaprojects
This is a list of megaprojects. Care should be taken in comparing the cost of projects from different times, even a few years apart due to inflation; comparing nominal costs without taking this into account can be highly misleading.
According to the Oxford Handbook of Megaproject Management in 2017, "Megaprojects are large-scale, complex ventures that typically cost $1 billion or more, take many years to develop and build, involve multiple public and private stakeholders, are transformational, and impact millions of people".[1]
Completed projects
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Under construction
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Proposed
| Project | Description | Location | Approximate cost (in billions USD) | Proposed start of construction | Proposed year of completion | Notes |
|---|---|---|---|---|---|---|
| Great Istanbul Tunnel | Railway, Undersea tunnel |  Istanbul |
$3.5bn[109] | TBD | TBD | After Marmaray and Eurasia Tunnel's, it will be the third tunnel to connect Istanbul's sides. |
| Arctic Railway | Railway |  Finland,  Norway |
3.31[110] | TBD | TBD | A connecting line between Kirkenes port and the Finnish railway network. |
| Bridge of the Horns | Bridge |  Djibouti,  Yemen |
20 | TBD | TBD | A bridge across the Red Sea. |
| Crossrail 2 | Railway, Commuter rail, Rapid transit |  Greater London, United Kingdom |
31.2[111] | 2023 | 2030s[111] | A new railway line in England, serving London, Surrey & Hertfordshire to interlink with Crossrail (above). |
| Helsinki City Rail Loop | Railway tunnel | Finland |
1.71[112] | TBD | TBD | An underground rail loop in Helsinki. |
| Helsinki–Tallinn Tunnel | Railway, Undersea tunnel | Finland,  Estonia |
17.13[113] | 2020 | 2024[114] | |
| Irish Sea Bridge | Bridge | United Kingdom |
19.15[115] | TBD | TBD | A proposed bridge between Scotland and Northern Ireland, supported by the Johnson ministry.[116] |
| Lentorata | Railway tunnel | Finland |
6.28[117] | TBD | TBD | An airport rail link for Helsinki Airport. |
| Malacca Strait Bridge | Bridge |  Indonesia,  Malaysia |
14[118] | TBD | TBD | A proposed 48 kilometer bridge over the Strait of Malacca. |
| Saudi–Egypt Causeway | Causeway |  Saudi Arabia,  Egypt |
4 | TBD | TBD | |
| Strait of Messina Bridge | Bridge |  Italy |
6.6 | TBD | TBD | |
| Sunda Strait Bridge | Bridge | Indonesia |
18.87[119] | TBD | TBD | The project has been indefinitely postponed.[120] |
| Singapore Strait crossing | Undersea tunnel |  Singapore, Indonesia |
TBD | TBD | TBD | A proposed tunnel between Singapore and Indonesia. |
| Suburban Rail Loop | Mass transit | .svg.png.webp){kind=small} Australia |
35.76-71.52[121] | 2022 | 2050 | A proposed extension of the Melbourne rail system. |
| Qatar–Bahrain Causeway | Causeway |  Qatar,  Bahrain |
5 | TBD | TBD | |
| Brightline West | High-speed rail |  USA |
8[122] | 2020 | 2024 | |
| Texas Central Railway | High-speed rail | USA |
5.9 | 2021 | 2026 | |
| Ontario Line | Rapid transit | .svg.png.webp){kind=small} Canada |
7.3-8.7[123] | TBD | TBD | 16 km, 15 stop line with at-grade, elevated and underground sections operated with driverless trains.[124] |
Airport projects
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