Businesses have been told the Scottish Government is doing all it can to mitigate the impact of the bridge closure amid suggestions the haulage industry is taking a huge financial hit each day.
Deputy First Minister John Swinney chaired a meeting of business organisations to hear about how the closure is affecting them.
The Road Haulage Association (RHA), the Scottish Chambers of Commerce, Transport Scotland and Fife Council were among the groups involved.
The RHA has warned that a 60-mile daily detour for its members could add an extra £30 in fuel costs alone, with an estimated 10,500 HGVs using the bridge each day.
Mr Swinney said: “This was a constructive and comprehensive discussion and a number of strong proposals were made.
“We will fully consider the points made by the business community and I am clear that, if the travel plan needs to be altered, we will do that.
“We will continue to work closely in partnership with business in the coming weeks to keep all issues under review.”
RHA chief executive Richard Burnett described the extra costs hauliers are facing as “immense” and warned that the additional operating overheads could be as much as £600,000 per day.
He said: “Already we have had reports from members who have had no alternative but to ask their customers for a rate rise a request that has, unsurprisingly, been met with a great deal of resistance.
“In addition to the increase in operating costs, the overall efficiency of the haulage industry in Scotland is already being greatly reduced as a journey that would take 30 minutes can now take up to three hours if the route is congested.”
Mr Burnett indicated the industry is expected to push the Scottish Government for compensation.
“Hauliers already working to tight margins simply cannot absorb these extra costs,” he said.
Other groups involved in Mr Swinney’s teleconference included the Confederation of British Industry, the Federation of Small Businesses and VisitScotland.