Vehicles painted with offensive slogans, such as the notorious Wicked campervans, could be banned from some areas along the New South Wales north coast.

Earlier this month, Byron Shire councillors heard from a local grandfather who spray-painted over a slogan that was describing a sexual act.

Councillor Duncan Dey has now lodged a motion calling for signs erected at the entry points to Byron Bay telling the drivers of Wicked vans they were not welcome.

He said vans with offensive slogans could also be banned from council-owned caravan parks.

"The motion has been looked at by council staff," Mr Dey said.

"What they're saying is that enforcement on offensive language is not something that a council can do.

"But any landowner can do it and so council could do it in relation to those vans trying to enter onto council property like a caravan park."

Byron Shire Council may also call on the Federal Government to legislate against offensive slogans.

The State Opposition raised concerns that the laws would not work. ( Flickr: Michael Coghlan )

Sexism should be dealt with the same as racial discrimination

Council staff recommended local delegates take a motion on the issue to June's national conference of the Australian Local Government Association.

Mr Dey said sexism should be dealt with in the same way as racial discrimination.

"Legislation making it unlawful for a person to engage in offensive behaviour based on another person's gender identity, sexual orientation or related grounds, that would wrap up the notion that you could write anything like that on a van because it would be illegal," he said.

The Ballina Council is also due to discuss the controversy surrounding Wicked vans this week.

Deputy Mayor Robyn Hordern will table a motion calling on the NSW Government to take action against vehicles with offensive slogans.

"We have no control over the state roads so therefore it will actually be a letter to the minister to encourage him to make changes in NSW," she said.

"I want it to be clear that I see these messages as being coarse, disgusting, and simply quite offensive.

"They're not appropriate to have parading up and down our highways."

The ABC has asked the owner of Wicked campervans for a response.

Tasmanian children's commissioner voices disapproval

Tasmania's Commissioner for Children Mark Morrissey said he had been following the media coverage about Wicked Campers with interest and was particularly concerned now that the vans had come to Tasmania.

"Opponents of the messages displayed on the vans are often derided as 'not having a sense of humour' or 'prudish'," Mr Morrissey said.

"However to find a message humorous, when that message verges on the incitement of hatred and vilification of individuals and groups on the basis of religion, gender, sexual orientation and race, is morally and socially reprehensible."

Mr Morrissey said it was worrying that the vans were parking at places children frequent, such as beaches, outside schools and playgrounds, at camp grounds, and in suburban areas.

"In addition there are a number of examples of vans with children's characters such as Snow White, Cookie Monster and Barbie in compromising and offensive situations which are equally alarming, as children will be drawn to images of their beloved characters," he said.