Plans to ban 25 metre B-Double trucks from turning from Sharp Street onto Bombala Street are underway.
The move comes after the newly built wall on Macks Corner, part of Cooma-Monaro Shire Council's CBD enhancements, was hit and damaged for a third time since November.
The trucks turning left from Sharp Street onto Bombala Street at the roundabout have failed to negotiate the tight angle and clipped the wall.
At their monthly meeting on Monday, councillors engaged in a lengthy discussion about the possible solutions to the problem.
Removing the wall completely was not considered as an option. In the past, council's director of engineering services Linda Nicholson has said the design of the wall was approved by the Roads and Maritime Service (RMS), which owns the road. Furthermore, the wall had been set back an additional 600mm from the kerb line to cater for 'one off' events.
Councillor Winston Phillips suggested that the RMS look at modifying the roundabout to enable more room for the large trucks to manoeuvre around the corner.
"The RMS should be asked to modify the middle of the roundabout so they [the trucks] can get through. That might protect the walls," he said.
Chair of the Cooma Monaro local traffic committee Cr Tony Kaltoum said the incidents had highlighted a bigger issue of safety.
"If the wall wasn't there it was still an issue of safety," he said.
"The truck still would go on the footpath. Having the wall there makes us know what's happening."
Councillors agreed with a recommendation from the Cooma Monaro Local Traffic Committee to revoke the approval of 25 metre B-Double trucks for Bombala Street between Sharp Street and Murray Street.
The trucks will be diverted through Polo Flat, with road name signage to be installed at both ends of Saleyards Road.
Mrs Nicholson said an application had been submitted with the National Heavy Vehicle Regulator (NHVR).
"We are hoping that this permanent solution will be approved in due course," she said.
"As an intermediate measure, the council (with the approval of the traffic committee) will install temporary advisory signs directing heavy vehicles to use Polo Flat Road when travelling between Bega and Canberra.
"Once approved additional signage will be installed to notify drivers. The date of this change will be detailed by the NHVR, and when it will come into force."
Mrs Nicholson said the responsibility of monitoring compliance and enforcement of penalties would be with the police, as normal traffic rules.
B-double trucks will still be allowed to travel straight at the roundabout towards Jindabyne.