Diono booster seat. Can this be used with just a lap belt

Hi Vicki, thank you for your inquiry, the Diono Cambria 2 must be used with a 3 point seat belt. This is for safety reasons as your child will not be secured safely in the vehicle with a lap belt and a booster. We hope this helps. if you follow the link http://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.