Illuminated signal devices and speed detectors for audio/video (A/V) recording and communication devices in accordance with various embodiments of the present disclosure are provided. In one embodiment, an illuminated signal device for providing a warning message of a passing vehicle is provided, the device comprising a speed detecting module, a communication module, and a processing module operatively connected to the speed detecting module and the communication module, the processing module comprising a processor, and a speed detecting application, wherein the speed detecting application configures the processor to detect motion of the passing vehicle using the speed detecting module, obtain speed data of the passing vehicle using the speed detecting module, and transmit the obtained speed data to a backend server, using the communication module, for providing the warning message of the passing vehicle to at least one social network.
