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.
The Discovery Sport has a standard blind spot warning system that uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. Only the CX-30 Select/Preferred/Carbon/Premium offers a blind spot warning system.
To help make backing out of a parking space safer, the Discovery Sport has standard Rear Traffic Monitor and Rear Traffic Braking automatically engages the brakes to help avoid a collision. Only the CX-30 Select/Preferred/Carbon/Premium offers Rear Cross Traffic Alert.
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, rearview cameras and driver alert monitors.
The Land Rover Discovery Sport weighs 580 to 856 pounds more than the Mazda CX-30. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

