Bay of Plenty drivers are being warned to look out for potentially hazardous 'summer ice' on the regions' roads.
The New Zealand Transport Agency advised motorists that after such a run of warm, dry summer days, rain can create extreme slippery road surfaces, says transport system manager Rob Campbell.
These slippery surfaces were typically known as "summer ice", Campbell said.
"It can be more hazardous than heavy rain because grime and exhaust particles that have built up on the road take longer to be washed away."
The combination created an invisible slippery film on the road, he said.
