3. Environmental factors
.1 the accident, including the direct curve slope / Hill ทางเข้าออกทางด่วน, link a crossroads, connecting residential building Etc. the often happened most frequently is direct.Additionally, it was found that the road accident 3 channel over the road 2 channels and the road 4 channels and ถนนสี่แยก is far more dangerous than the intersection
.2 road conditions is a hole or damaged with mud. There barricades. Or the narrow road, the road slippery, has caused an accident has 3.Lighting condition on the road, such as the light from the car park derived by light and high ความสว่างสูง, amblyopia look clear or light signal intersections. On the dark road, no electricity, no light, made invisible.Is harmful to driving
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