Aiming at solving the problem of road and bridge damage and frequent accidents caused by vehicle overload, which always lead to serious loss of people's life and property, the concept of road and bridge "fuse" was proposed in order to maintain the safety and normal service of roads and bridges, the road and bridge anti-overload facility for combined friction was developed. It can realize the functions of automatic identification and restriction of vehicles exceeding the allowable traffic load of roads and bridges. The facility is composed of platform, slider group, limit reset device and alarm device. Automatic identification of overloaded vehicles is realized through the balance force system formed by the vehicle and the facility; when the overload vehicle passes through, the slider group produces linkage slip, and the right slider lifts, so as to restrict the overload vehicle's passage; the limit reset device controls the sliding speed of the slider group and restores the original position of the slider group to ensure vehicle safety and facility operation. The stress state diagrams of the sliding blocks were provided respectively under whole vehicle overload ultimate equilibrium condition, overload slip equilibrium condition and jack jacking reset condition, and the balance equations of the slider group were established. The design method and case of the facility based on the load limit of roads and bridges were given, and the weight measurement accuracy control measures of the facility were put forward.