New Zealand roads are about to re-enter a dangerous window as schools return for term one.

A report from driver safety advocacy group AutoSense claims accidents linked to fatigue happen most between 7 and 8am, the hour children head to school.

CEO Charles Dawson says fatigue is driven by our body clock - and it can be dangerous.

"Any vehicle that has a human behind the wheel is going to be prone to this, it's all about our natural physiology." 

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