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Emergency services in Canterbury are warning road users of black ice after several crashes over the weekend.
A driver has been transported to hospital in a serious condition after their car crashed at 7.45am on Sunday on Tunnel Rd, between the Scruttons Rd on-ramp and the Bridle Path Rd on-ramp in Christchurch, police said.
No one else was involved in the incident.
Tunnel Rd was closed for a time, but it has since reopened.
Black ice on the roads have been reported throughout the Canterbury District.
Christchurch Fire and Emergency has warned motorists to care after several cars came off roads due to black ice.
Police say residents are urged to avoid any unnecessary travel today.
Fatal crash on SH75
Meanwhile, one person has died following a crash in Canterbury.
Police said the single-car crash happened at 12.20am on Sunday on State Highway 75, between Robinsons Bay and Takamatua Bay.
The driver was the sole occupant of the car.
Old Waimakariri Bridge reopens
The Old Waimakariri Bridge on Main North Rd was closed after a single-car crash but has now reopened.
Police said a vehicle crashed through the bridge railings and into a creek at 5.45am on Sunday.
The driver is reported to be unhurt.
Road users were advised to take alternative routes where possible.