Motorway lid raises worries over fumes
A type of lid proposed to go over an exposed section of motorway on the latest option for the State Highway 20 Waterview connection is causing controversy.
The area in question is the 100 to 150 metres between the two tunnels, near the intersection of Great North and Blockhouse Bay roads in the Avondale Heights community.
The lid was recently discussed at an Avondale Community Board meeting.
Tunnel or Nothing Group advocate Margi Watson says she does not endorse the option of a lid or the current combined surface tunnel option and says if the section is covered, the fumes at either end will be worse.
“The fumes will race down to Oakley Creek and to the Metro Soccer Club and will blow on to housing,” she says.
New Zealand Transport Agency acting regional director Tommy Parker says the effects of covering the open area should be clearer when staff report back to the NZTA board in late August.
“We have heard people’s concerns about this and are looking at further engineering design to address them,” he says.
“No decisions about this have been made.”
Mr Parker says the open area of road between the two tunnels near Great North Rd is in the current design.
“Tunnel ventilation design and air quality modeling will determine what ventilation issues are considered.”
He says optimal locations for ventilation structures have not yet been determined.
“Tunnel air dispersed through a ventilation structure in this way minimises any adverse effect on local air quality.”
Auc k l and Ci t y Council roads manager Matthew Rednall says input from the community has identified issues and one of the questions people have raised is why the two tunnels cannot be connected.
“We want the best outcome for the area,” he says.
Councillor Noelene Raffills says this is the first time the issue has been discussed.
She says council officers discussed the issue with NZTA to try to find a better outcome which is some kind of cut and cover.
“It was suggested they were taking this on board – which is what this whole thing is about,” she says.