In most places, car insurance becomes mandatory when a vehicle is registered. The specific requirements vary by location, but in general, drivers are required to have at least a minimum amount of liability insurance to cover damages or injuries caused to others in an accident. Failure to maintain the required car insurance can result in penalties, fines, and even the suspension of driving privileges. It's important to check the specific laws and regulations in your area to ensure compliance with mandatory car insurance requirements. Additionally, some jurisdictions may have exceptions or alternative methods of financial responsibility, so it's crucial to understand the options available to meet the legal obligations for car insurance.