Main Roads Western Australia | 27,427 followers on LinkedIn. Keeping WA moving since 1926 | We are one of the largest geographically spread road agencies in the world, responsible for more than 18,500 kilometres of road spread over 2.5 million square kilometres. Our role is to plan, build and maintain Western Australia’s State Road Network valued at just over $46 billion. We work closely with our portfolio partners, Department of Transport and Public Transport Authority as well as local government to support the needs of all road users across the state by providing an integrated world-class road transport network.