Why do we have car registrations
Car registrations are a yearly mandatory registration for all operable cars that drive on public roads.  Its a way to keep track of the number of cars on the roads and to also collect taxes from people who drive on public roads for public road maintenance and repair.  The price to register a vehicle depends on the type of vehicle, size, dimensions and weight.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Why do we have car registrations
### Input: 
### Response: Car registrations are a yearly mandatory registration for all operable cars that drive on public roads.  Its a way to keep track of the number of cars on the roads and to also collect taxes from people who drive on public roads for public road maintenance and repair.  The price to register a vehicle depends on the type of vehicle, size, dimensions and weight.