Temporary average speed cameras are to be switched on at the A90 northbound at the Forth Road Bridge.
The cameras are being installed during road works and will be switched on from Thursday until December 2016.
The works are upgrading the road network ahead of the new Queensferry Crossing being built.
The speed limit on the A90 northbound has been reduced to 40mph from south of the Forth Road Bridge to Admiralty Junction.
Steven Brown, Transport Scotland roads and infrastructure manager, said: “We know from our experience of major road infrastructure projects that safety cameras are a tried and tested approach that improves safety for road users and construction workers.
“We have been impressed with the levels of compliance with the 40mph speed limit since it was introduced on the A90 northbound.
“We have waited for as long as possible before introducing the safety cameras to the A90, now significant operations are underway within close proximity to live traffic. The safety of our workforce and the travelling public is of paramount importance and the cameras will encourage a safe and steady flow of traffic through the works area.
“Additional safety cameras are expected to be installed southbound on the A90 in this area later this year.”