In a monitoring system of a power wheelchair (low-speed mobility vehicle) and an automobile (vehicle of different type) having a remote monitoring device connected to them through a first communicator, each of the wheelchair and automobile includes a first transmitter transmitting location data to the remote monitoring device through a first communicator, and the remote monitoring device calculates an inter-vehicle distance between the wheelchair and automobile based on the location data and transmits an approaching signal indicating that they are approaching each other when the inter-vehicle distance is equal to or less than a first predetermined value, thereby reducing the driving burden on the operators and enhances driving safety.