Traffic has resumed to normal after two crashes that took place within five minutes of each other on either side of the State Highway 1 near Rolleston.

The incidents had caused serious traffic delays.

A two-car crash near Berketts Road in the north had resulted in bumper-to-bumper traffic and motorists were being advised to take a detour via Jones Road.

There was also a significant bottle neck near the site of a second crash on the south side of Rolleston at the intersection near Walkers Rd.

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None of those involved were injured, said St Johns Control Centre Team Manager Alan McKay.

Drivers should avoid State Highway 1 if possible, NZTA had advised.