This New Zealand sign to indicate a hump in the road is the same as this one in the UK:
If you are approaching one of these signs you will need to check your speed and slow down if necessary. The hump could cause suspension damage, or damage to the underside of your vehicle if you hit it too fast. If you are riding a motorbike it could cause you to become airborne.
The hump might not be that visible if it’s wet and dark, or if there’s snow, so pay attention to where the signs are.
The humps mean you have to slow down, and accelerating again burns fuel. So how do you drive really economically, using as little fuel as possible? Find out in this article about driving smoothly – it’ll help save you money.