Dashboard light when driving on the motorway

It's possible that the light was related to the seatbelt not being properly fastened. Modern vehicles often have sensors that detect whether seatbelts are secured, and an unfastened seatbelt can trigger a warning light. If the issue persists or if you notice any other unusual behavior, it might be worth checking the seatbelt sensor or consulting a mechanic. Let me know if you have any further questions or if the issue reoccurs.