Drivers have been warned of possible delays due to work on safety improvements along a two-and-a-half mile stretch of the M1 in West Yorkshire.
The work, between junction 41 at Carr Gate, Wakefield, and junction 42 at Lofthouse, involves the replacement of steel central reservation barriers with concrete ones and the installation of new lighting and improved drainage.
The initial phase of the work began last Monday and involved the closure of the hard shoulder for the removal and upgrading of lighting columns from the central reservation to the motorway verges.
It is anticipated that the traffic management schemes, including speed limit reductions, will operate round the clock until early January.
A spokesman for the Highways Agency said that in order to limit the scale of any delays during the first phase, a three lane operation would be maintained on each carriageway.
During the work, narrow lanes and a 50mph speed limit will operate to protect the safety of the motorway's users and those working on the scheme.
The second stage of the work, involving the central barriers, will continue until to March and will result in the temporary closure of lane three on the both carriageways and drivers using the hard shoulder.
Drivers have been advised to approach the roadworks with care and allow extra time for journeys.