Availability varies. Enrollment discount applies during data collection; final discount is calculated on driving behavior and could be zero. Discounts do not apply to all coverage elements; actual savings vary by state, coverage selections, rating factors and policy changes. Final discount applies at the next policy renewal and remains until drivers or vehicles on the policy change.
Metromile also uses an OBDII-based system for their mileage-based insurance. They offer a true pay-per-mile insurance where behavior or driving style is not taken into account, and the user only pays a base rate along with a fixed rate per mile. The OBD-II device measures mileage and then transmits mileage data to servers. This is supposed to be an affordable car insurance policy for low-mileage drivers. Metromile is currently only offering personal car insurance policies and is available in California, Oregon, Washington, and Illinois.
CTP insurance is compulsory in every state in Australia and is paid as part of vehicle registration. It covers the vehicle owner and any person who drives the vehicle against claims for liability for death or injury to people caused by the fault of the vehicle owner or driver. CTP may include any kind of physical harm, bodily injuries and may cover the cost of all reasonable medical treatment for injuries received in the accident, loss of wages, cost of care services and, in some cases, compensation for pain and suffering. Each state in Australia has a different scheme.