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There are 4,774 kilometres of risk-rated national highway in Western Australia, which is 23 per cent of the total National Land Transport Network. During the period from 2010 to 2014, there were 717 casualty crashes on these roads, accounting for five per cent of the national total. These casualty crashes included 81 deaths, which equates to nine per cent of total fatalities across the network.
The following table lists the national highways in Western Australia, with aggregated information provided.
The highest level of road trauma in the Western Australian network occurred on the Great Northern/Victoria Highway, which accounts for 40 per cent of casualty crashes and 47 per cent of fatalities. These high numbers are in fact relatively low compared to the length of the highway, which is 66 per cent of the network. By contrast, the Forrest Highway constitutes just two per cent of the length of the whole network, yet it has disproportionately high casualty crashes and fatalities figures at 21 and 16 per cent respectively.
The following table lists the worst 10 highway sections in Western Australia, ranked from highest to lowest risk. Western Australia has one highway section in the national worst 10 list: Great Northern/Victoria Highway from the Kununnurra turn-off to the Northern Territory border.
The following table lists the best 10 highway sections in Western Australia, ranked from lowest to highest risk. The best two sections in this state also appear in the top 10 best sections for Australia.