As work continues on the duplication of the Southern Expressway, the road will be closed at times this week to allow blasting for the Seacombe Road Bridge works.

The expressway will be closed from 9:30am till 3:30pm on Thursday and Friday, and from 4:00am till 9:00pm Saturday.

Main South Road at Darlington will also be closed for approximately 20 minutes on Friday at 12:55pm, with southbound traffic diverted to Marion Road or Flagstaff Hill, and north bound via Black Road or Majors Road.

The cycling path along the eastern side of the expressway will also be closed between Seacombe Road and Majors Road from midday till 1:30pm on Friday.

The works are part of the $407.5 million duplication project for the Southern Expressway, which will result in an 18.5 kilometre multi-lane, two-way motorway from Bedford Park to Old Noarlunga by mid-2014.