A real-time application-based cellular system with real-time GPS positioning to notify civilian drivers of the proximity of emergency services vehicles in sufficient time to allow appropriate response. Civilian users receive alerts and information on their personal computing devices, including, but not limited to, tablets and smart phones. No addition or special hardware is required. Only drivers in a moving vehicle with a certain proximity are directly and selectively notified. The system also is able to send other additional customized warning signals to citizens in threatening situations in a non-vehicular context.