When it comes to describing a vehicle or mode of transportation that is not traveling on established roads, there are a variety of synonyms that can be used. Some of the most common include off-road, off-highway, unpaved, uncharted, and rugged terrain. These terms are typically used to describe vehicles that are designed to navigate difficult or uneven surfaces, such as four-wheel drive trucks, ATVs, and dirt bikes. Off the roads can also be described as backcountry or wilderness areas, where vehicles are not permitted or are limited to certain trails. Whatever the terminology used, it's important to exercise caution and respect for the environment when traveling off the roads.