Safety features found on the 2011 BMW X3 include an anti-lock braking system and a brake assist system. To prevent brakes from overheating, ventilated four-wheel disc brakes are included. These brakes allow you maximum stopping power. The slotted design is designed to allow the brakes to be cooled. This allows the brakes to stop quickly without damaging brake pads or calipers. Electronic Brake Distribution, controlled by the anti-lock braking system and engine management, allow the X3 to vary the amount of force applied to each brake based on road conditions, weight on each wheel, and speed. This braking system allows the driver to have more control in dangerous situations since the X3 is doing some "thinking" for each individual brake. Another similar safety feature is Stability Control. This allows correction of acceleration during turns. It works on the same principles of Electronic Brake Distribution but is more useful during turns. Another safety feature present on the X3 is the use of independent front strut suspensions with stabilizing bars and springs. The rear is connected to a multi-link suspension with stabilizer bar and springs to further add to the vehicle's safety. Driver and passenger airbags are standard in both the xDrive28i and the xDrive35i. Also included in these BMWs are side airbags and rear curtain airbags for further protection from collisions. To prevent whiplash injuries, the X3 has 5 adjustable head restraints. These restraints are placed strategically to minimize the risk of getting whiplash during an accident.