The flyover would have carried motorists between the Mt Victoria and Arras tunnels.

Community groups who opposed the Basin Reserve flyover have proposed a "design-a-thon" to come up with a new solution to Wellington's traffic woes.

The idea would mean anyone with an idea for how to improve the Basin Reserve roundabout could submit a proposal, similar to the way some Christchurch rebuild projects have been conducted.

Those wanting to get involved could invent a complete transport solution or simply design one particular element, such as where the school bus stops might be.

1 of 11 NZTA An aerial perspective of how the proposed Basin Reserve flyover would look in central Wellington. 2 of 11 NZTA An artist's impression of what the proposed Basin Reserve flyover would look like from the top of Cambridge Terrace, looking towards the cricket ground. 3 of 11 NZTA What the proposed Basin Reserve flyover would look like from Hania St, looking towards the Mt Victoria Tunnel. 4 of 11 NZTA How the proposed Basin Reserve flyover would look from the southern end of Kent and Cambridge terraces, looking east. 5 of 11 FAIRFAXNZ What the proposed Basin Reserve flyover would look like from the top of Kent Terrace, looking towards Buckle St and the National War Memorial. 6 of 11 NZTA A computer simulation of how the proposed flyover would look from the median between Kent and Cambridge terraces in central Wellington. 7 of 11 NZTA A computer simulation of how the proposed flyover would look from Ellice St. 8 of 11 NZTA A computer simulation of how the proposed flyover would look from level three of Grandstand Apartments on Kent Terrace in central Wellington. 9 of 11 NZTA The proposed new pavilion that would be built at the northern end of the Basin Reserve to block views of the flyover from inside the cricket ground. 10 of 11 NZTA How the proposed new pavilion would look from within the Basin Reserve. 11 of 11 NZTA How the proposed new pavilion would look from within the Basin Reserve.

Those elements would then be packaged up into complete designs and a short-list of eight would be selected.

An "evolutionary design process" would then be followed. The eight designs would be split into four pairs with the best elements of each pair being combined into four new complete designs.

The pattern would then be repeated until one final design remained.

NEW ZEALAND TRANSPORT AGENCY/SUPPLIED Could you design a better solution to central Wellington's traffic congestion than the Basin Reserve flyover?

Members of the Save the Basin campaign, Newtown Residents Association, Mt Victoria Historical Society, Mt Cook Mobilised and Fair Intelligent Transport Wellington will put the proposal to Wellington's political leaders on Monday.

Wellington Central MP Grant Robertson, who helped put the proposal together, said it would ensure the public felt more involved in the process than it did during development of the New Zealand Transport Agency's $90 million flyover.

The agency's plans for a two-lane highway flyover, 20 metres north of the country's most famous cricket ground, attracted very vocal public opposition before being scuppered by an independent board of inquiry in July 2014.

"This would challenge NZTA to think in a different way, but that's what they've been asked to do [by the board]," Robertson said.

If a particular design got through to the stage where it was being seriously considered or accepted into the finals solution then there would be scope for that person or company to be paid for their work, Robertson said.

The "design-a-thon" would only happen after the Transport Agency, local councils, key stakeholders and the public had figured out what problems it wanted to solve at the Basin, and whether separation of State Highway 1 and local roads was actually needed there.

Other objectives, such as protecting the historic value of the area or a desire to turn the area between Kent and Cambridge terraces into an open stream and park might also be identified, Robertson said.

He did not know how long the entire process could take. "We want things figured out as quickly as possible to get on with it, but we also want a good solution."