As well as being wasteful of water, it can create a slippery surface on a warm, sunny day, says Waka Kotahi Maintenance Contract Manager for Mid and South Canterbury John Keenan.

“We had an experience of this a few days ago on the Methven highway, SH77. If drivers see spray water hitting the highway, slow down and let us know so we can contact the land-owner.”

Motorcyclists and cyclists in particular need to take care on wet roads.

People can phone 0800 4 Highways with the information, says Mr Keenan.

The Methven highway, SH77, a few days ago.

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