Abstract: A first responder transit alert system and method cause notifications to be sent to wireless personal computing devices (PCDs) in vehicles traveling in the forward path of the first responder vehicle traveling to an emergency site. A processor of the system performs a process comprising: determining whether a wireless alert signal has been broadcast by a wireless device of the first responder vehicle; if so, receiving and processing geographical coordinates of multiple positions of PCDs traveling in vehicles in one or more lanes of a highway system and geographical coordinates of multiple positions of the wireless device of the first responder vehicle to determine velocities of the PCDs and of the wireless device; processing the positions and velocities to determine a subset of the PCDs to which to send a wireless alert notification; and causing the wireless alert notification to be sent to the PCDs of the subset.