Two fire trucks from Bulls were sent about 1.55pm.
NZTA said a truckful of sand was used to clean up the diesel in the late afternoon. Police were on scene to assist with traffic management.
Cause of truck’s diesel spill unclear
Beets said the cause of the spill was “a split diesel tank”.
Police said initial indications suggested “the tank was punctured by debris on the road”.
NZTA said it was unclear exactly what happened.
“When there has been a spill, it’s always important road users continue to take care.”
Temporary 70km/h speed signs were left in place overnight.
Eva de Jong is a reporter for the Whanganui Chronicle covering health stories and general news. She began as a reporter in 2023.