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Motorcycle Greenslips

What has engine capacity got to do with causing injury or death to a third party? How can a motorcycle (whatever the engine capacity) possibly cause the same amount of injury/death as a car? The MAA and the insurers need to come clean and explain how these costs are calculated. As the CTP system is compulsory the goverment should be trying to keep costs as low as possible and insurance companies should be limited to a base profit from this product.