The paper presents the general characteristics and design of weighing systems for vehicles in motion (WIM). A number of problems and limitations that accompany these systems on the way to achieving full automation of the weighing process at the desired level of accuracy are pointed out. The procedure and construction of preselection systems are discussed, and the mechanism of detailed control at the static control point is presented. Attention is drawn to the use of the WiFi standard for data transmission from the system to the control point, with a discussion on the associated limitations and risks. An alternative solution is proposed, using LoRa standard devices, employed in LoRaWAN wireless sensor networks, to transmit data from the station. A minimum data set for identifying an overloaded vehicle, designated MDIOV, is defined. Based on this, a WIM system emulator was developed, and field measurements were conducted to evaluate the feasibility of using LoRa devices.