The WA Government is letting kids deliver its latest road safety message.

A video titled “It's Child's Play” features children driving toy cars to educate Perth motorists how to merge in traffic.

The video will run across the state in a five-week campaign showing motorists, in simple terms, how to merge safely and in good time.

Transport Minister Bill Marmion said merging was key issue.

“When I became Minister for Transport, the very first question I got from the media was; ‘What do you think about West Australian people merging?’” he said.

“We think it is child's play. It is very simple.

“But the message really is to be courteous. It's really a no brainer.”

The clip is accessible below.