The New Zealand Transport Agency's billboard campaign aims to educate the public about the importance of wearing seatbelts in the backseat of vehicles. The creative concept uses a slingshot with a rear car seat to visually demonstrate the potential danger of not wearing seatbelts, which could lead to being ejected from the vehicle in an accident. This eye-catching and impactful visual serves to raise awareness and change behavior, potentially saving lives by encouraging the use of seatbelts regardless of seating position.