The Transport Agency says there is virtually no chance of people ever being able to cycle across the Auckland Harbour Bridge.
Parts of the latest report given to the agency by cycling advocates are described by engineers as infeasible.
The report was reviewed by engineering firm Beca, which has given only brief comments.
Transport Agency regional highways manager Tommy Parker says this is because it contained the same flaw as earlier reports put forward.
He says the there is a limited extra load the bridge can carry, and the agency won't restrict traffic on the bridge for a cycleway.
A spokesperson for the cycleway campaigners says Beca's response is vague and unsubstantiated.