A car has struck a pedestrian in Blenheim, critically injuring a 85-year-old man.
Emergency services attended the serious crash on Nelson St, near Hutcheson St.
A St John spokeswoman said three ambulances arrived at the crash within five minutes, and a helicopter was also called to the scene.
She said the man is in a critical condition and has been flown to Wellington Hospital.
A police spokesperson said the incident happened about 1.20pm.
The road is one down to one lane and traffic management is in place.
"Motorists are advised to avoid the area."