A protective helmet is disclosed comprising a protective shell, a visor, two rearward-mounted imagers, a display, and a processing system. The protective shell has an opening in front that is selectively covered by the visor and is configured to fit about the head of a user. The two imagers are mounted in substantially fixed positions on the rear of the protective shell so as to collectively provide a view of greater than 180 degrees about the rear of the protective shell. The processing system is operably associated with the two imagers and the at least one display, which displays real-time video from at least the left-most of the two imagers, as well as real-time video from the right-most imager or navigation, positioning, audio entertainment, or telephone call information. The helmet may further include a multi-level proximity alert system, an impact emergency alert system, and rechargeable power system.