The Z has standard Active Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Head Restraints system moves the headrests forward to prevent neck and spine injuries. The Cooper Hardtop 2 Door doesn’t offer a whiplash protection system.
The Z’s blind spot warning system uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The Cooper Hardtop 2 Door doesn’t offer a system to reveal objects in the driver’s blind spots.
To help make backing out of a parking space safer, the Z’s standard Rear Cross Traffic Alert uses sensors in the rear to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The Cooper Hardtop 2 Door doesn’t offer a rear cross-path warning system.
Both the Z and the Cooper Hardtop 2 Door have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras and driver alert monitors.
The Nissan Z weighs 535 to 993 pounds more than the MINI Cooper Hardtop 2 Door. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.

