Christchurch police have arrested 30 boyracers who were part of a large disorderly gathering in the north of the city.

A teenager has been charged with dangerous driving causing death after a four-year-old boy was hit by a car on a footpath in May.

Shocked education officials are surprised police won't put more effort into catching bus drivers who speed through special 40km/h zones.

Two pilots used their airside security passes to sneak onto Queenstown Airport runway in the middle of the night to race a car.