VICROADS estimates that it will be at least six weeks before electronic warning signs near Timboon can be repaired.
The advance hazard signs, at the intersection of the Cobden-Port Campbell Road and the Timboon-Cooriemungle Road (New Cooriemungle Road), have not been working since last December.
The signs were designed to alert motorists of slow moving vehicles entering from side roads.
Corangamite Shire councillor Steve Cumming raised concerns about the signs during a meeting this week.
He said motorists came to rely on them and suggested they should be covered over until they could be fixed.
A VicRoads spokesman said yesterday that, in the event of a power outage, the signs acted as permanent static warning signs to warn motorists of the intersection ahead.
"Due to the complexity of the damaged electrical components, repairs to the flashing lights must be undertaken off site," he said.
"The contractor has advised it will take up to six weeks, subject to obtaining the electronic components, before the signs are repaired and reassembled on site."