The speed limit on the Queensferry Crossing is to be raised to 50mph for Monday morning.
Drivers have been restricted to 40mph since the bridge opened in August.
In time for the morning rush hour on Monday, the limit will be raised on the M90 across the Forth between Admiralty and Scotstoun.
Later this year the speed limit will be increased to 70mph, but work continues on the phased introduction of the Forth crossing strategy.
Traffic Scotland operator manager, Stein Connelly, said: “The new 50 mph speed limit on the Queensferry Crossing will be in place for the Monday morning peak and drivers will be advised by our signs on the approach roads.
“As always, we would urge road users to be aware of the change and take care as they get used to the new limit.
“Traffic Scotland will have all of the latest real-time travel information on our mobile site, twitter feed and radio.”
The 40mph speed limit has been in force for driver and worker safety during construction and tie-ins with the road network and the Forth Road Bridge.
This work is reaching its final phases, the first stage being the reopening of the Forth Road Bridge for public transport last month.
Scheduled public buses began using the older bridge on October 13.
Work to allow other buses, taxis and motorcycles to join them are nearing completion.
Full motorway and public transport corridor regulations are expected to come into force before the end of the year.
Once the new bridge is a fully operational motorway the Intelligent Transport System will dictate when a variable mandatory speed limit is in place, reducing it from 70mph.
Statutory processes are underway to allow the bridge to move to motorway status and will conclude with the successful completion of the roads orders.
Tourist traffic when the Queensferry Crossing opened caused huge tailbacks.
Although bridge bosses said the unusually high volume of traffic had subsided, they said the new arrangements were still bedding in and were being kept under review.
Transport Scotland, Traffic Scotland, Amey and the Forth Bridges Operating Company continue to monitor the performance of the bridge and surrounding roads and junctions.