Work to raise capacity on the M1, near Wakefield is starting earlier than the previously scheduled date of 2014/15, and is due to be completed in September 2015.
The £105m construction contract will see bmJV convert the hard shoulder to a permanent traffic lane along an 8-mile stretch of motorway between junction 39 (Durkar) and junction 42 (Lofthouse).
Previously the pairing delivered the smart motorway improvements on the M62 between junction 25 and junction 30.
The experience gained from this scheme has been used to streamline the M1 construction timetable.
Variable mandatory speed limits, displayed on overhead and verge-mounted signs, will help smooth the flow of traffic and reduce congestion.
Gary Crisp, contracts director for bmJV, said: “We are delighted that our previous experience gained on a range of highways schemes, including the M62, has ensured we are best placed to provide the travelling public with this improved road network earlier than originally scheduled.
“We look forward to continuing to work collaboratively with the Highways Agency to realise this vital scheme to reduce congestion and improve journey times, without reducing safety.”