Using vehicle speed sensors and seat sensors, smart airbags in the UX deploy with different levels of force or don’t deploy at all to help better protect passengers of all sizes in different collisions. The UX’s side airbags will shut off if a child is leaning against the door. The CX-50’s side airbags don’t have smart features and will always deploy full force.
The UX has standard Whiplash Injury Lessening Front Seatbacks, which use a specially designed seat to protect the driver and front passenger from whiplash. During a rear-end collision, the Whiplash Injury Lessening Front Seatbacks system allows the backrest to travel backwards to cushion the occupants and the headrests move forward to prevent neck and spine injuries. The CX-50 doesn’t offer a whiplash protection system.
Both the UX and the CX-50 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors, available all wheel drive and rear parking sensors.
The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a post at 20 MPH, results indicate that the Lexus UX is safer than the Mazda CX-50:
|
|
UX |
CX-50 |
|
|
Into Pole |
|
| STARS |
5 Stars |
5 Stars |
| Max Damage Depth |
12 inches |
13 inches |
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.
Side impacts caused 23% of all road fatalities in 2018, down from 29% in 2003, when the Insurance Institute for Highway Safety introduced its side barrier test. In order to continue improving vehicle safety, the IIHS has started using a more severe side impact test: 37 MPH (up from 31 MPH), with a 4180-pound barrier (up from 3300 pounds). The results of this newly developed test demonstrates that the Lexus UX is safer than the CX-50:
|
|
UX |
CX-50 |
| Overall Evaluation |
GOOD |
GOOD |
| Structure |
GOOD |
GOOD |
|
|
Driver Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Neck Tension |
223 lbs. |
268 lbs. |
| Torso |
GOOD |
ACCEPTABLE |
| Shoulder Deflection |
.83 in |
1.34 in |
| Shoulder Force |
223 lbs. |
357 lbs. |
| Torso Max Deflection |
1.02 in |
1.61 in |
| Torso Deflection Rate |
7 MPH |
10 MPH |
| Pelvis |
GOOD |
ACCEPTABLE |
| Pelvis Force |
892 lbs. |
982 lbs. |
| Head Protection |
GOOD |
GOOD |
|
|
Passenger Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Torso |
GOOD |
GOOD |
| Torso Deflection Rate |
6 MPH |
8 MPH |
| Head Protection |
GOOD |
GOOD |

