| | Other factor group 3 | | Layer | Topics | Rate |
| | Layer 1 | Alignment | Right-curve, right-curve 500 m–1000 m, right-curve 1000 m more, straight | 9% | | Inclination | Uphill, uphill less than 1%, uphill 1% to 3%, uphill 3% more, uphill less than 500 m, flat | 8% | | Cut and fill | Flatness, cut part less than 10 m, cut part 10 m more | 5% |
| | Layer 2 | Point of occurrence | Main lane | 1/2, 1/3, 1/4, 2/2, 3/3, 2/4, 3/3, 4/4 | 11% | | Shoulder | 1% |
| | Layer 3 | Traffic obstacle factors | Non-working section, normal | 9% | | Road environment | Dry, wet | 9% | | Main accident cause | Poor loading, object on roads | 7% |
| | Layer 4 | Accident type | Single accident, shoulder guardrail, rear-end, head-on | 8% | | Vehicle operation just before the accident | Driving, overactive handle | 8% | | Main accident type | Vehicle-vehicle, vehicle-structure, others | 10% |
| | Layer 5 | Day and night | Daytime, nighttime | 7% | | Weather | Sunny, rainy | 8% |
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