Leighton Holdings Ltd has been awarded a $US300 million ($A290.11 million) Oman government roads building contract.

Leighton subsidiary Habtoor Leighton Group (HLG) on Tuesday said the contract involved the expansion from two to four lanes of a 75km section of road south of Muscat in a joint venture with Turkey’s Sezai Turkes-Feyzi Akkaya (STFA).

“The scope of work also includes the construction of nine interchanges and 50 kilometres of service roads,” HLG said in a statement.

The road duplication project is part of the Oman government’s upgrading of the country’s road network.

“Work on this section of the highway will begin immediately and is expected to be completed within three years,” HLG said.

HLG chief executive Laurie Voyer said he expected the company to be awarded further Oman government contracts.