BudgetGuessr rankings

The most expensive road and highway projects in our catalogue

The 25 most expensive of 104 built and under-construction road and highway projects in the BudgetGuessr catalogue, ranked by documented cost in US dollars.

1
North East Link
Australia · 2023 · Road or highway$17.34 billionUnder constructionEstimate$17.34 billionUnder constructionEstimateAUD 26.1 billion · Published project estimate
2
Appalachian Development Highway System
United States · 1965 · Road or highway$15.15 billionUnder constructionEstimate$15.15 billionUnder constructionEstimate$15.155 billion · Published project estimate
3
Boston Central Artery/Tunnel project (Big Dig)
United States · 2007 · Road or highway$14.8 billion$14.8 billionReported project cost
4
Delhi–Mumbai Expressway, 2022 estimate
India · Road or highway$12.72 billionUnder constructionEstimate$12.72 billionUnder constructionEstimateINR 1000 billion · Published project estimate
5
West Gate Tunnel Project
Australia · Road or highway$6.57 billionEstimate$6.57 billionEstimateAUD 10.2 billion · Published project estimate
6
A9 Sierre East–Visp East completion
Switzerland · 2037 · Road or highway$5.83 billionUnder constructionEstimate$5.83 billionUnder constructionEstimateCHF 5.135 billion · Published project estimate
7
Bruce Highway
Australia · Road or highway$5.8 billionUnder constructionEstimate$5.8 billionUnder constructionEstimateAUD 9 billion · Published project estimate
8
Delhi–Katra Expressway
India · 2026 · Road or highway$4.46 billionUnder constructionEstimate$4.46 billionUnder constructionEstimateINR 389.05 billion · Published project estimate
9
Stoney Trail
Canada · 2023 · Road or highway$2.96 billion$2.96 billionCAD 4 billion · Reported project cost
10
Washington State Route 509
United States · 2029 · Road or highway$2.83 billionUnder constructionEstimate$2.83 billionUnder constructionEstimatePublished project estimate
11
M80 Ring Road
Australia · 2024 · Road or highway$2.51 billionUnder constructionEstimate$2.51 billionUnder constructionEstimateAUD 3.8 billion · Published project estimate
12
A7 Afsluitdijk reinforcement and renewal
Netherlands · 2030 · Road or highway$2.35 billionUnder construction$2.35 billionUnder construction€2.079 billion · Approved budget
13
M6 Motorway
Australia · 2025 · Road or highway$2 billionUnder construction$2 billionUnder constructionAUD 3.1 billion · Approved budget
14
A14 Cambridge–Huntingdon improvement scheme
United Kingdom · 2022 · Road or highway$1.85 billion$1.85 billion£1.5 billion · Reported project cost
15
Winston-Salem Northern Beltway
United States · 2026 · Road or highway$1.74 billion$1.74 billionApproved budget
16
Sydney Gateway
Australia · 2024 · Road or highway$1.72 billion$1.72 billionAUD 2.6 billion · Reported project cost
17
M62 motorway
United Kingdom · 2007 · Road or highway$1.53 billion$1.53 billion£765 million · Reported project cost
18
Regina Bypass
Canada · 2015 · Road or highway$1.47 billion$1.47 billionCAD 1.88 billion · Contract value
19
Western Sydney Airport Motorway
Australia · 2026 · Road or highway$1.35 billion$1.35 billionAUD 2.1 billion · Reported project cost
20
Guangshen Expressway
People's Republic of China · 1997 · Road or highway$1.34 billion$1.34 billionReported project cost
21
M25 motorway
United Kingdom · 1986 · Road or highway$1.33 billion$1.33 billion£909 million · Final project cost
22
Rruga e Kombit (Albania A1)
Albania · 2011 · Road or highway$1.3 billion$1.3 billionReported project cost
23
Long Thanh – Ben Luc Expressway
Vietnam · 2026 · Road or highway$1.22 billion$1.22 billionVND 29587 billion · Reported project cost
24
Port of Miami Tunnel
United States · 2014 · Road or highway$1.11 billion$1.11 billion$1.113 billion · Original budget
25
National Highway 248BB
India · 2025 · Road or highway$1.09 billion$1.09 billionINR 94.6 billion · Reported project cost

How this ranking works

This is a curated catalogue, not an exhaustive list of every megaproject. Projects are ordered by their recorded US-dollar equivalent; each detail page shows the source amount and any currency conversion. Figures are not adjusted for inflation, and construction bills, estimates, and programme costs can have different scopes. Unbuilt proposals and cancelled projects are excluded.

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