我国一些尚未通柏油路的农村道路为土路或砂石路,路面状况差,坡陡、弯急、路窄,且坑洼不平。晴天,特别是久旱天气干燥时,路面上尘土飞扬,细尘土被带走后,路面上便出现乱石和坑洼。雨天,特别是遇上连阴雨时,土壤被浸泡成饱和状态,路面上积水、泥泞、沟壑随处可见,甚至造成路肩塌陷。因此,驾驶人在农村土路上行车时必须了解各种天气和条件下的路面 Some of the rural roads in our country that have not passed asphalt roads are dirt roads or gravel roads. The road conditions are poor with steep slopes, sharp bends, narrow roads and uneven potholes. In sunny weather, especially when the weather is dry for a long time, dusty roads and potholes appear on the road after the fine dust is taken away. In rainy days, especially in rainy days, the soil is soaked into a saturated state that water and muddy roads and gully can be seen everywhere, causing the road shoulder to collapse. Therefore, when driving on rural dirt roads, drivers must understand the pavement under various weather conditions