The WA government has backed down on proposed mandatory signage for road trains after a backlash from the trucking industry.

At the time, Main Roads WA told the ABC the Restructed Access Vehicle (RAV) warning signs were designed to give drivers more information in order to make better decisions on whether to overtake.

After concerns were raised, Main Roads WA said it formed a "Heavy Vehicle Road Signage Reference Group" with trucking companies and other industry representatives.

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The new signage laws came into effect in WA in July, mandating that road trains would have to carry metal signs telling drivers the length of the long vehicle in both metres and in equivalent car lengths.

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Industry figures said the updated rules, which would have required operators to buy new signs stating the length and configuration of their road trains, were impractical and overly costly.

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After backlash in July, Main Roads WA said it formed a review group with the sector's leaders, culminating in a decision to scrap the mandatory sign changes.

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Western Roads Federation chief executive Cam Dumesny said costs quickly stacked up, with some companies having to purchase new signage for hundreds of trucks.

He said that was because, firstly, road trains were often adding and removing trailers, often of different sizes, and the signs would have to be changed frequently.

"The new RAV warning signs are optional but offer several benefits, including providing more information to other road users, helping them decide if it is safe to overtake the road train or long vehicle," a Main Roads spokesperson said.