Motorists on State Highway 1 in Waikato are advised to expect delays this weekend.
Waka Kotahi NZ Transport Agency says lane reductions and other traffic management at works on the Rangiriri section of the Waikato Expressway will stay in place at weekends.
Waka Kotahi had planned to have all lanes open on weekends.
Travellers should allow extra time if travelling on this section of the expressway, Waka Kotahi said.
It was recommended drivers merge early into a single lane to help lessen congestion.