One trapped after car rolls at Christchurch intersection

Thick fog quickly descends on Christchurch this morning. Photo / via twitter

A car rolled, trapping a person inside, at a Christchurch intersection this morning.

Police say the crash happened about 6.40am at the intersection of Colombo and Salisbury Streets.

Fire crews had to cut free a person from the upturned vehicle.

An ambulance spokesman said a person was taken to Christchurch Hospital with moderate injuries.

Salisbury St was initially closed but one lane was now open.

Salisbury St is now open to 1 lane of traffic. ^SM https://t.co/2CQosE5ihF pic.twitter.com/8iLu6ohG7d

— TFC (@TransportChCh) April 26, 2017

Conditions when the crash happened were clear. But heavy fog has since descended on Christchurch.

Very heavy fog has now hit the City. Take extra care and watch following distances! ^SM pic.twitter.com/WxtmqILRIc

— Waka Kotahi NZTA Canterbury & West Coast (@WakaKotahiCWC) April 26, 2017

The MetService said the fog should soon clear, and will be followed by a fine 21C day.

Areas of fog about #Christchurch should clear this morning, leaving a fine day https://t.co/5v4V4jknSd ^PL pic.twitter.com/uNPsjx6IL8

— MetService (@MetService) April 26, 2017

Shortly after 8am the fog was starting to clear from the central city.