He said there was no community buy-in and people were frustrated.
"I think it shows that they've got it totally wrong in the first place."
A council spokesman said no fines had been issued for bus lane infringements.
"Over the coming weeks, the council will send out warning notices in the first instance before escalating to issuing infringement notices."
People who drive along bus lanes in New Zealand risk a $150 fine.
Cronin also asked the council whether the road closure and designation of the bus lane was legal.
In response, the council said the road was closed legally for safety reasons.
On its website, it says the end of Hairini St was closed on June 25 because there was a heightened risk of nose-to-tail collisions at the end of the street.
The council and the transport agency observed people driving at speed down Hairini St being caught out by the road layout change where a temporary stop sign had been put in at the end of the road.
In an email to Cronin, the council said the legal basis for the bus lane is a temporary prohibition of traffic under clause 11 of schedule 10 of the Local Government Act 1974.
"Enforcement powers are under clause 16 of schedule 10 of the Local Government Act and under council's statutory and bylaw powers to enforce the use of a bus lane."
The council said New Zealand Transport Agency and the New Zealand Police supported the temporary traffic ban.
Further technical work was under way in regard to transport issues and possible options in the Hairini area.
"This activity will be followed by public engagement at a future date. Once that is completed the permanent arrangements will be known."
The new bus lane allows buses to take an uninterrupted trip from Hairini St on to the causeway toward the Hairini bridge and Turret Rd.
Cronin said there was still anger and concern among local residents about the new bus lane and road closure.
"Part of the reason is that if you go the way you are now being forced to, you go from Hairini St back up to the Hairini roundabout, then you're faced with a give-way to get on to the roundabout, then, just after you've done that, you're faced with a pedestrian crossing with lights.
"Then, about 40m or 50m along from there, you're faced with more lights at the Maungatapu roundabout to get back on to the ramp to get you back to where you would have been five minutes before."
He said it is unnecessary and timewasting and is pushing local traffic back on to the State Highway.
Cronin wants Hairini St to be a give-way T-intersection on to the ramp that comes down from the Maungatapu roundabout.
