For enhanced safety, the front and second-row seat shoulder belts of the Land Rover Discovery have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Toyota Highlander doesn’t offer pretensioners for its second-row seat belts.
Both the Discovery and Highlander have child safety locks to prevent children from opening the rear doors. The Discovery 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 Highlander’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.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the Discovery. But it costs extra on the Highlander.
The Discovery 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 and moves the vehicle back into its lane. Only the Highlander LE/XLE/XSE/Limited/Platinum offers a blind spot warning system.
To help make backing out of a parking space safer, the Discovery has standard Rear Traffic Monitor and Rear Traffic Braking automatically engages the brakes to help avoid a collision. Only the Highlander LE/XLE/XSE/Limited/Platinum offers Rear Cross Traffic Alert.
Both the Discovery and the Highlander have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, 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 Land Rover Discovery weighs 415 to 1000 pounds more than the Toyota Highlander. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

