KEY POINTS:
A key strategy of Auckland City Mayor Dick Hubbard's election campaign - mobile billboards on the back of buses - is under scrutiny after complaints it breaches the council's bylaw for election signs.
Mr Hubbard is adamant the signs are legitimate but officers are seeking a legal opinion from council lawyers Simpson Grierson.
Regulatory planning manager Andrew Gysberts said the bylaw was ambiguous.
In the meantime, the council was taking a "benign" attitude to the signs.
The council has asked another mayoral candidate, Steve Crow, to move a trailer-mounted billboard from overlooking Spaghetti Junction in upper Queen St and took it away when he parked the mobile sign on Tamaki Drive.
Mr Hubbard has already been warned by police that his election advertising is technically illegal. Under the Local Electoral Act, political candidates' authorisation details must have a physical address. Mr Hubbard gave a PO Box address.
