South Western Highway will be significantly upgraded under a long-term strategy prepared by Main Roads.
Transport Minister Pam Beggs today said the plan involved widening, reconstructing and sealing shoulders, completely rebuilding some sections and installing more passing lanes.
Mrs Beggs said work being undertaken this financial year included reconstructing and installing a passing lane at Newlands. The estimated cost was $1.3 million.
Similar work costing $1.1 million was planned for the highway at Hesters Hill next financial year.
Mrs Beggs said steps already had been taken to improve the road surface of the highway just north of Bridgetown and the need for a minor realignment at Hesters Bridge was being investigated.
Main Roads would continue to widen the narrower seal on the highway between Walpole and Denmark. A number of sites were being examined for passing lanes.
Mrs Beggs said the increasing demand for maintenance of the roads in the south west was a result of the furious pace at which the road system was built in the 1950s and 1960s.