Traffic will be restricted to a single lane in each direction from 03:00 until 12:00 on both days and this is expected to result in long delays in both directions lasting into the afternoon.
Due to the urgent nature of the work, restrictions could be extended into the afternoon if weather causes a delay.
The authorities are advising the public to avoid using the bridge at these times if possible, take the train or find an alternative route.
Full details can be found on the Forth Road Bridge website: http://www.forthroadbridge.org/node/816