State Highway 73 will reopen to single lane traffic past the Otira slip tomorrow, but with delays, and the rail line is expected to open on Wednesday.
The NZ Transport Agency said its contractors had made good progress over the weekend clearing the significant slip that buried the highway and railway line near Deception Point, between Aickens and Otira.
About 9000 cubic metres of material was removed yesterday.
NZTA journey manager Lee Wright said the slip was far larger than initial estimates, and was now put at between 40,000 and 50,000 cubic metres.
From 8am on Tuesday the highway will reopen to one lane with 10-minute openings on the hour during daylight hours only, from 8am to 7pm. The road will be closed to all traffic overnight.