Driving in the Philippines

While writing a very mild story, I came upon this:

Traffic Accidents (2003)

Cause Frequency(percent)

Driver's Error 25.72
Drunk Driving 0.57
Mechanical Defect 12.20
Overspeeding 17.71
Using Cell Phone 0.29
Road Defect 4.77
Hit and Run 4.10
Bad Overtaking 12.44
Bad Turning 9.40
Overloading 7.15
Self Accident 4.91
Others 0.75

This was from 16,418 accidents. Source: Traffic Management Group, Philippine National Police. Until 1998, the health sector through the Department of Health used to compile health statistics, including information on casualties due to road traffic accidents. The information was published in Philippine Health Statistics. For unknown reasons, this compilation was stopped.

Sir, what is self accident?