If the sensory system detects a small front passenger, it initially only triggers the first airbag stage, depending on the predicted impact severity, meaning that less air is injected into the airbag. If the system senses a larger front passenger, however, both airbag stages are triggered. The engineers have also further improved the crash sensors. By way of example, the Mercedes-Benz S-Class and CL-Class are fitted with a total of eleven sensors which provide data regarding the type and severity of an impact at an early stage and are able to differentiate between a frontal impact, side impact, rear impact and rollover. Like the further developed restraint systems – seat belts, airbags and head restraints – extensive innovations covering practically every aspect of the body structure and the passenger cell provide invaluable assistance in critical situations.