The RZ has a standard Secondary Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Leaf doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
The RZ 450e has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The Leaf doesn’t offer all-wheel drive.
Both the RZ and Leaf have rear cross-traffic warning, but the RZ has Parking Support Brake (automatically applies the brakes) to better prevent a collision when backing near traffic. The Leaf’s Rear Cross Traffic Alert doesn’t automatically brake.
Both the RZ and the Leaf 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, front wheel drive, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, lane departure warning systems, blind spot warning systems, rearview cameras and rear cross-path warning.
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 RZ is safer than the Leaf:
|
|
RZ |
Leaf |
| Overall Evaluation |
GOOD |
ACCEPTABLE |
| Structure |
GOOD |
MARGINAL |
|
|
Driver Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Head Injury Criterion |
124 |
211 |
| Torso |
GOOD |
GOOD |
| Shoulder Deflection |
.47 in |
1.14 in |
| Shoulder Force |
156 lbs. |
245 lbs. |
| Torso Deflection Rate |
6 MPH |
6 MPH |
| Pelvis |
GOOD |
ACCEPTABLE |
| Pelvis Force |
825 lbs. |
1093 lbs. |
| Head Protection |
GOOD |
GOOD |
|
|
Passenger Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Head Injury Criterion |
82 |
158 |
| Neck Tension |
22 lbs. |
67 lbs. |
| Torso |
GOOD |
GOOD |
| Shoulder Deflection |
.24 in |
1.54 in |
| Shoulder Force |
112 lbs. |
335 lbs. |
| Torso Max Deflection |
1.06 in |
1.38 in |
| Pelvis |
GOOD |
ACCEPTABLE |
| Pelvis Force |
469 lbs. |
937 lbs. |
| Head Protection |
GOOD |
GOOD |
The Lexus RZ achieved a “Top Safety Pick” rating from the Insurance Institute for Highway Safety (IIHS) for the 2024 model year. This recognition was based on its impressive performance in the small overlap frontal crash test, updated side impact crash test, headlight evaluations, and pedestrian crash prevention testing. The Leaf is not a “Top Safety Pick” for 2024.

