State Highway 1 near Ōhau, south of Levin, will now be closed until tomorrow morning.
The road has been shut since 8am on Wednesday after the trailer of a fuel tanker rolled.
Diversions are in place at Vista Road, Muhunoa East and Bishops Road.
The road is likely to remain shut till 2am on Thursday.
Motorists are advised to avoid the area if possible, and to expect delays.
UPDATE 3:35PM
— NZ Transport Agency - Central North Island (@nztacni) May 8, 2024
SH1 will remain CLOSED through Ōhau, south of Levin until tomorrow morning due today's earlier crash. NB queues are back to Ōtaki with SIGNIFICANT DELAYS of over an hour. SB also expect DELAYS. Please consider delaying your journey. ^EH https://t.co/t6rjZhNXTU pic.twitter.com/Ak3oq7N9yU