The construction at the Main South, Riccarton and Yaldhurst Rds Church Corner intersection will involve installing lights to help reduce the risk of a crash for people turning right.
The left and right turns from Main South Rd to Riccarton and Yaldhurst Rds will be retained.
As part of the work there will also be marked cycle lanes, a signalised pedestrian and cycle crossing, a short section of bus lane on Riccarton Rd, and speed humps on all approaches to the intersection installed.
During the construction, Main South Rd will be closed in the evenings to eastbound traffic coming from State Highway 73.
Westbound traffic from Riccarton Rd will be unable to access Yaldhurst Rd but the detours will be clearly signposted.
"A reduced speed limit will be in place, and some traffic management may be visible in preparation for the evening works, but businesses around the intersection will be open as usual.
"The intersection is in the top 3% in Christchurch for crash risk, with 76 crashes in a 10-year period involving right turns from Main South Rd, including three serious injuries and seven minor injuries."
The council approved the work in December after it was delegated the decision by the Waipuna Halswell-Hornby-Riccarton Community Board.
