A new £25.6M upgraded road junction supporting the new Forth Replacement Crossing (FRC) will open on 1 February.
The new M9 junction 1a will provide improved connection for road traffic in West Lothian and to north west of Edinburgh,
It is part of three major contracts to deliver the FRC along the upgraded M90 in Fife opened last December as well as the £1bn main contract.
Contractor Sisk Roadbridge delivered the project for client Transport Scotland. The junction has an Intelligent Transport System (ITS) allowing the first use of managed motorways in Scotland.
The main three span cable-stayed crossing is due to open in 2016.