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The two projects, across the various construction phases, could be worth a combined €1.45bn ($1.67bn) over the next five years.
The contract includes upgrades to a 5km section of I-4 near State Road 429, aimed at easing congestion and improving traffic flow.
Veidekke's biggest-ever order involves the expansion of the E134 with a new Oslofjord Tunnel tube and wider motorway.
The Eden Project Morecambe is set to open in 2028 and will include landscaped gardens and two shell-shaped domes.