From the number and nature of the injuries he got, it is almost sure that he was not wearing seat belt. Most of the injuries were to the chest, lungs, ribs, neck and thighs. Looks like the actor was violently thrown against the dashboard in the impact. It was early morning and they were driving from Cochin to Coorg, at least 4-5 hours continuous drive before the accident. The accident location has a sharp curve with inclination downwards. It is possible that the driver might have dozed for a microsecond, lost control of the vehicle, and hit the median before he could do anything.