Downer EDI (ASX:DOW) won contracts of up to nine years to provide road maintenance and incident response services on Transurban's (ASX:TCL) northern assets in New South Wales, according to a Thursday filing with the Australian bourse.

Transurban's northern assets include the NorthConnex tunnel, M2 Motorway, and Lane Cove Tunnel, the filing said.

Service delivery under the New South Wales Incident Response and Maintenance Services (North Region) contracts will start in July for an initial seven-year term, with the option for two one-year extensions.

The company expects total revenue of AU$310 million over the full nine-year term, per the filing.

Downer shares fell 1% in morning trade on Thursday.