The passenger compartment of the Z4 remained stable in the frontal offset test. Dummy readings indicated good protection of the kneesand femurs of the driver and passenger. BMW demonstrated that a similar level of protection would be provided to occupants of differentsizes and to those sitting in different positions. In the full-width rigid barrier test, protection of the driver was good or adequate for all criticalbody areas. In the side barrier test, all critical parts of the body were well protected and the car scored maximum points. Likewise, fullpoints were scored in the more severe side pole test, with good protection all-round. Tests on the seats and head restraints demonstratedgood protection against whiplash injuries in the event of a rear-end collision. The Z4 has a standard-fit autonomous emergency braking(AEB) system which operates at the low speeds, typical of city driving, at which many whiplash injuries occur. In tests of this functionality,the system scored maximum points, with collisions against another vehicle avoided in all test scenarios.