"We understand the inconvenience this closure may cause and we'd like to apologise in advance for any disruptions. The damage to the bridge is extensive and we need to complete this work to keep the public safe.
"Once the work is finished we should be able to open the road to two lanes while we look at what other repairs need to be carried out," Boyt said.
A temporary speed limit will be put in place near the crash site because of the reduced lane widths on the bridge.
The truck and trailer rolled in icy conditions, with the trailer ending up partially submerged in the river below the Waihohonu Bridge. No-one was injured in the crash.
Details of SH1 Desert Rd closures:
• First closure from around 7.30am Wednesday up to 9am for a detailed damage assessment.
• Second closure from around 10.30am Wednesday until up to 12pm for the installation of safety barrier.
• People should use the NZTA website to determine when the road has closed.
• People should use an alternative route such as State Highway 49, 4 and 47.
• The detour could add up to 40 minutes to a journey.