Dakar 18

Dakar 18 is a racing game set in an open world environment. It features both offline and online single-player and multiplayer modes. The world of the game is over 5,791 square miles (15,000 km²) in size, which is roughly the size of the U.S. state of Connecticut (or the Moquegua Region of Peru), and completely explorable. Five categories of vehicles will be available, including cars, trucks, motorcycles, quads and UTVs. Players also have the option to exit their vehicle and explore the world by foot.

Source: Wikipedia, "[en.wikipedia.org/wiki/Dakar_18 Dakar 18]", available under the CC-BY-SA License.