路沿石是路面边缘的界石，也称道牙石、路边石、路牙石，在路面上作为区分车行道、人行道、绿地、隔离带和道路其他部分的界线，起到保障行人、车辆交通安全、保证路面边缘整齐、保护路基的作用。
Curb stone is the boundary stone of pavement edge, also known as toothstone, roadside stone and curb stone. It is used as the boundary to distinguish the carriageway, sidewalk, green space, isolation belt and other parts of the road. It plays a role in ensuring the traffic safety of pedestrians and vehicles, ensuring the neat edge of the pavement and protecting the subgrade.
路沿石是道路的基础设施之一，主要用于区分车行道、人行道、绿地、隔离带和其他部分的界线，起到保障行人、车辆交通安全和保证路面边缘整齐的作用，同时对保护路基，防止水土流失也有一定的作用。
Curb stone is one of the infrastructure of the road. It is mainly used to distinguish the boundaries of the carriageway, sidewalk, green space, isolation belt and other parts, which can ensure the traffic safety of pedestrians and vehicles and ensure the neat edge of the road surface. At the same time, it also plays a certain role in protecting the subgrade and preventing soil erosion.