For enhanced safety, the front and second-row seat shoulder belts of the Infiniti QX80 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 Lincoln Navigator L doesn’t offer pretensioners for its second-row seat belts.
The QX80 Sensory’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Navigator L doesn’t offer pre-crash pretensioners.
For enhanced safety, the front and middle seat shoulder belts of the Infiniti QX80 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Lincoln Navigator L doesn’t offer height-adjustable middle seat belts.
The QX80 has standard Active Head Restraints (AHR), which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the AHR system moves the headrests forward to prevent neck and spine injuries. The Navigator L doesn’t offer a whiplash protection system.
Both the QX80 and Navigator L have rear cross-traffic warning, but the QX80 has Back-up Collision Intervention (automatically applies the brakes) to better prevent a collision when backing near traffic. The Navigator L’s Cross-Traffic Alert doesn’t automatically brake.
Both the QX80 and the Navigator L have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, around view monitors, rear cross-path warning and available all wheel drive.
The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the Infiniti QX80 is safer than the Lincoln Navigator L:
| 
 | QX80 | Navigator L | 
| 
 | Front Seat | |
| STARS | 5 Stars | 5 Stars | 
| Abdominal Force | 81 lbs. | 108 lbs. | 
| Hip Force | 144 lbs. | 180 lbs. | 
| 
 | Rear Seat | |
| STARS | 5 Stars | 5 Stars | 
| HIC | 31 | 61 | 
| Spine Acceleration | 21 G’s | 27 G’s | 
| Hip Force | 151 lbs. | 434 lbs. | 
| 
 | Into Pole | |
| STARS | 5 Stars | 5 Stars | 
| Spine Acceleration | 39 G’s | 47 G’s | 
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

