is it illegal to have christmas lights on your car

(With authority) While having Christmas lights on your car may not be illegal, it is generally considered inappropriate and could potentially be a distraction to other drivers. It's also important to make sure that the lights don't impair your visibility or interfere with your ability to safely operate the vehicle. If you plan to display Christmas lights on your car, it's best to do so in a way that is safe and doesn't pose any potential risks to yourself or others.