Where is the inertial or inertia switch located?

The 2003 Hyundai Elantra, like many Hyundai models from that era, does not come equipped with an inertial switch. Inertial (or inertia) switches are safety devices commonly found in some vehicles, particularly certain Ford models, which are designed to cut off fuel supply in the event of a collision or significant impact. This is to prevent fuel spillage and potential fire hazards post-accident.