Sydney motorists are already choosing alternate routes into the city after the bridge removed cash tolling points. Many motorists also claim the Government makes it too difficult to get an e-tag or new e-toll pass.
"Already we're seeing something like 2000 extra cars come via Victoria Road into the city as a result of that cashless tolling," Mr Stoner said. "That protest will be even greater when the toll goes from $3 to $4 during peak times."
He said Premier Nathan Rees must act before January 27 to alter his plan to increase the toll to avoid gridlock on key roads to the city.
"We could well see thousands more cars using Victoria Road and the Gladesville Bridge," he said. "It will be like a car park unless something is done now."
The toll on the bridge will rise by $1 from during morning and afternoon peak periods.