Fire services are responding to a fuel tanker that rolled causing a fuel spill on State Highway 1 north of Ōhau in Horowhenua.
The incident occurred about 7.30am on Wednesday and has closed a section of the highway, causing delays. Diversions are in place.
Police expected the road to reopen late Wednesday afternoon but at 3pm said it would likely remain closed until about 2am on Thursday.
A Fire and Emergency NZ spokeswoman said the road would be closed “for several hours” while fire personnel dealt with the incident.
Fire services were assisting with fire protection and dealing with the fuel spill.