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"People need to drive to the conditions," Simpson said. "It's raining and the road is slippery and wet and stopping distances are longer than the dry so they just need to be careful.
"There have been several minor crashes so far this morning mainly due to the rain and the roads being wet after being dry for so long and gives it a greasy surface."
NZ Transport Agency transport system manager Rob Campbell has previously labelled the greasy road surface "summer ice".
"After an extended run of warm, dry summer days like we've had, any rain can result in slippery road surfaces, otherwise known as summer ice," he said last month.
"Even a very small amount of rain can make the roads very slippery. In fact, 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.
IT'S RAINING, IT'S POURING 🌧🌧
Police are urging motorists to take extra care on the roads today with the heavy rain....
Posted by Waikato Police on Tuesday, 3 March 2020
"The combination of light rain and summer grime creates a slippery film on the road."
Summer ice was believed responsible for at least one of the four fatal crashes in the Waikato last month which claimed 5 lives, including a woman at Tahuna.
SUMMER ICE DANGER
• Slow down,
• Allow further room for stopping distances,
• Make sure tyres have correct air pressure and tread,