If you want to prevent weeds in your gravel driveway, there are a few different approaches that you could take. One of the easiest solutions is to use a commercial herbicide product that is designed to create an invisible barrier that will prevent weeds from growing. However, some people do not like to use these products as they can be damaging to the environment. If this is the case, consider other eco-friendly products such as diluted vinegar. Another more permanent option—though much more labor-intensive—is to take up your driveway and put down a weed barrier before covering it with gravel.