Both the Discovery Sport and CX-30 have child safety locks to prevent children from opening the rear doors. The Discovery Sport has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The CX-30’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
When descending a steep, off-road slope, the Discovery Sport’s standard Hill Descent Control allows you to creep down safely. The CX-30 doesn’t offer Hill Descent Control.
To help make backing out of a parking space safer, the Discovery Sport has standard Rear Traffic Monitor with Rear Traffic Braking, systems which detect vehicles approaching from the sides and can automatically apply the brakes to prevent a collision. Only the CX-30 Turbo Premium Plus offers Smart Braking Support - Rear Crossing.
Both the Discovery Sport and the CX-30 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and driver alert monitors.
The Land Rover Discovery Sport weighs 578 to 861 pounds more than the Mazda CX-30. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

