The exemplary crash responses of the new BMW 3-Series Sedan body also provide the best possible basis for the optimum design and set-up of the car's restraint systems. The sports sedan is equipped as standard with front and side airbags for the driver and front passenger, plus head airbags for both rows of seats. In European models the front airbags have two-stage deployment. Responding to the nature and severity of the impact, the integrated safety electronics ensure that only those airbags that are able to provide effective protection are deployed at the optimum time. Those airbags that are not required remain unused - and therefore ready to spring into action should there be a second collision. All seats are fitted with three-point inertia-reel seat belts, and the driver and front passenger also have belt latch tensioners and belt force limiters. Also part of standard specification are ISOFIX child seat attachment points for the rear seats.