DISRUPTION along the A646 Burnley Road near Luddenden Foot should be over by mid-February.
Since last month, motorists have complained of long tailbacks and being caught in queues for an hour due to roadworks.
Problems have stemmed from a crumbling retaining wall leading down to the Rochdale Canal.
Calderdale Council put together a repair project, which has included work by Northern Gas Network and Yorkshire Water.
“The reason for the wall collapse has been identified during the works as a leaking valve on an adjacent water main.
“That was repaired last Saturday by Yorkshire Water,” said a council spokeswoman.
Earier, workmen diverted a gas main at the council’s request.
Contractors are now working seven days per week to rebuild the wall.
During the week, traffic lights are manually operated in the morning and evening during peak travel periods to reduce delays to motorists.
But due to the sheer volume of traffic on the busy route, some delays have been found to be unavoidable.
“Calderdale Council apologises for any inconvenience caused to road users during this essential work,” said its spokeswoman.