Speed cameras

[Esceptico]

I know this is a basic question...but which direction to the fixed speed cameras work in NZ? Generally in the U.K. a camera on the left will catch traffic going past on the left ie photo from behind. However in Switzerland there were some that worked in both directions.

At the moment I’m making sure my speed is okay whichever side of the road they are on so not a problem but I’m curious.