Drivers have been warned to expect delays on the Horbury bypass due to gas maintenance work.
Northern Gas Networks is currently replacing old metal gas mains on Northfield Lane with plastic pipes.
A spokesman for Northern Gas Networks said: “Modern plastic pipe are more durable, and will serve the area well for years to come.
“We have been liaising closely with the highways authority to minimise traffic delays, and temporary traffic lights are only being used outside peak times.
“We hope to have the work finished by mid-week next week.”