Road management firm Transfield Services Ltd (ASX: TSE) said on Wednesday that it has sealed a preferred contractor status for a $US172 million or $A195.21 million contract with Canada's Ontario Ministry of Transportation.

The company said that the contract would cover for the 12 years of maintenance and operations of road in the Sault Ste Marie area of Ontario.

At the same time, Transfield said that it has closed a seven-year, $US15 million agreement with the United States' Florida Department of Transportation for the state's asset maintenance of eight movable bridges and associated infrastructures.

The company has also signed a $US15 million contract with the Alaska Department of Transportation and Public Facilities that would cover the operation and maintenance of the state's Anton Anderson Memorial Tunnel.

Transfield chief executive Peter Goode said that the company secured the North American deals due mainly to its sterling record of disciplined management of long term contracts.