4xe models, like the Wrangler 4xe, come equipped with a Pedestrian Alert SystemDisclaimer: This system is an alert system for the front of the vehicle. It is not a substitute for active driver involvement. The driver must remain aware of traffic conditions and be prepared to use brakes to avoid collisions.. Whenever you’re driving at 20 mph and under, this safety and security feature produces an audible sound, letting pedestrians know you’re driving near them by making an audible noise.