Most people think that you cannot drive with your cargo lights on, but you actually can. Your cargo light is the small light above your rear window that comes on when you open your trunk. Many people think that this light is only for when you are loading or unloading something from your trunk, but it is actually legal to drive with this light on. There are a few reasons why you might want to do this.
If you have a trailer hitch and are going to be doing any towing, then it is required by law in some states to have your cargo light on while driving. This is so that other drivers can see your trailer and know that you are pulling something behind you. Even if your state does not require it, it is still a good idea to have your cargo light on so that other drivers are aware of what you are doing.
Another reason why you might want to drive with your cargo light on is if you have an aftermarket stereo system installed in your car. In many cases, the wires for these systems run through the trunk of the car and come out near the cargo light. If these wires are not properly insulated, they could short circuit and cause a fire. By having your cargo light on, other drivers will be able to see the wires and know to give them a wide berth.
So, there are two good reasons why you would want to drive with your cargo light on - either because it is required by law or because it could help prevent an accident. So next time someone tells you that driving with your cargo light on is illegal, just smile and let them know that they're wrong!