As unmanned autonomous commercial vehicles increasingly need to coordinate and collaborate effectively with remote safety inspectors and assistance systems, it becomes crucial to further clarify the functions and operation methods of remote assistance systems. This paper first reviews the relevant policies for the commercial deployment of unmanned vehicles, defines the autonomous commercial vehicles and the responsibilities of remote safety inspectors. Subsequently, based on the functional definition of unmanned commercial vehicles in the transportation service field and the job responsibilities of remote safety inspectors, the basic functions of remote auxiliary systems are determined. On this basis, we propose a comprehensive architecture of a remote assistance system consisting of three components: the platform subsystem, the vehicle subsystem, and the network interface. The platform subsystem includes high-performance servers, display systems, operating systems, and the remote safety inspector status monitoring device. A comprehensive study was conducted on the two main functional types within the remote assistance system: regular monitoring and abnormal event handling. Among them, regular monitoring includes the monitoring function when one remote safety inspector is monitoring the status of multiple vehicles. Abnormal events are proposed based on the actual operation of autonomous vehicles, and the abnormal event handling function is further divided into three categories based on the way of resolving the abnormal events: voice communication, remote assistance, and emergency stopping.