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Premier Colin Barnett says country drivers are frustrated by continually changing speed limits and he intends to "do something about it" after the election.

Mr Barnett said the complaint had been raised continually with him at public forums during the past two years.

"It's an issue raised by the public which the Government will take up," he said.

When pressed, he declined to detail how he intended to address the matter and in what locations, prompting Labor to describe it as a "Barnett thought bubble".

Transport Minister Troy Buswell said the issue had not been discussed around the Cabinet table.

Asked if there were too many speed limit changes on country roads he said: "Generally not."

"Although I have to say as a frequent user of country roads, on the approaches to and from some country towns there does seem to be some inconsistency in how the speed limits come down," he said.

"We often ask Main Roads to review those. Sometimes they make changes for a range of other reasons, sometimes they don't.

"I don't sense that it's a big issue."

Main Roads spokesman Dean Roberts said the independent statutory commission set speed limits according to a range of factors "to achieve a balance between road safety, community amenity and transport efficiency".

Those factors included traffic volumes, crash data, types of road users, roadside development and the frequency and type of intersections.

"The limit reduces where the highway environment changes such as approaches to built-up areas or where residential or industrial developments have access roads connecting to the highway," Mr Roberts said.

"On high-speed rural roads on the approach to town sites, buffer zones are applied where there is a reduction in the speed limit of more than 30km/h.

"For example, a road with the speed limit of 110km/h will have to have a buffer of 80km/h prior to the town site limit of 50km/h."

Shadow transport minister Ken Travers said: "This is just another thought bubble by Mr Barnett to distract the public from his Government's four years of neglect of country roads.

"Mark McGowan and WA Labor will make fixing dangerous country roads a priority."