The new Infiniti M35h hybrid will receive a new warning system that will alert pedestrians to its approach, as some safety officials have expressed concern over their virtually silent electric motors.

Although not mandated by the National Highway Traffic Safety Administration, Nissan has elected to put a noisemaking system on the new M35h in order to keep pedestrians safe in city settings. The automaker originally developed the Approaching Vehicle Sound for Pedestrians (VSP) system for use in the all-electric Nissan Leaf.

The VSP system will work between 0 and 20 miles per hour and automatically detect when a pedestrian enters the car's path, emitting a distinctive noise. The sound cuts out once the driver brakes to under 15 miles per hour.

The Detroit Free Press notes that the new feature is as much a marketing opportunity for Infiniti and Nissan as it is a safeguard against pedestrian accidents. The new model was recently unveiled at the LA Auto Show, and the automaker is already advertising the quiet engine on both the M35h and Leaf as a selling point for the vehicles.

Drivers who are interested in purchasing a hybrid or electric vehicle might want to wait until they hit the used car market, where they'll likely be relatively more affordable than when bought new.