Motorists have been told to expect delays as a £500,000 scheme to upgrade gas mains in Barnsley starts.
National Grid will install 3km of new plastic pipes will be laid to replace the iron mains.
Project manager Christopher Wade said the work was essential and the plastic pipes had an 80-year life span.
Work starts on Wednesday, August 8, on a section of the left hand lane of the Alhambra roundabout. It will be closed for two weeks.
The following Monday, August 13, work will start on Sheffield Road to the junction of Park Road. The left hand lane will be closed and there will be no left turn onto Union Street or Burleigh Street from Sheffield Road.
Work is expected to last until the middle of September.
In October, Cemetery Road will become one way with no access from Sheffield Road. There will be a diversion taking traffic from Sheffield Road onto Taylor Row and Doncaster Road. This work is expected to last for four weeks.
Mr Wade said: “This project is a major investment in the safety and reliability of the gas supply in Barnsley. We are starting this work during the summer when gas usage is lowest and the school holidays mean there are fewer traffic movements.
"This is a busy part of the road network but our traffic arrangements will ensure that traffic will continue to flow. It will be a short term inconvenience for long term benefit.”
He said National grid was working closely with Barnsley Council to minimise disruption.