For enhanced safety, the front and rear seat shoulder belts of the Lexus ES Series 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 Prius doesn’t offer pretensioners for the rear seat belts.
The ES Series 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 Prius 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 ES Series offers an optional Panoramic View Camera to allow the driver to see objects all around the vehicle on a screen. The Prius only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
Both the ES Series and the Prius have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, driver alert monitors, available blind spot warning systems and rear cross-path warning.
The Lexus ES Series weighs 470 to 770 pounds more than the Toyota Prius. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Lexus ES Series is safer than the Toyota Prius:
|
|
ES Series |
Prius |
|
|
Driver |
|
| STARS |
5 Stars |
4 Stars |
| HIC |
120 |
244 |
| Neck Injury Risk |
24% |
30% |
| Neck Stress |
239 lbs. |
344 lbs. |
| Neck Compression |
30 lbs. |
42 lbs. |
|
|
Passenger |
|
| STARS |
4 Stars |
4 Stars |
| Neck Injury Risk |
33% |
53% |
| Neck Stress |
159 lbs. |
173 lbs. |
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.
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 ES Series is safer than the Toyota Prius:
|
|
ES Series |
Prius |
|
|
Into Pole |
|
| STARS |
5 Stars |
2 Stars |
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.
For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its standard headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the ES Series its highest rating: “Top Pick Plus” for 2021, a rating granted to only 35 vehicles tested by the IIHS. The Prius last would have qualified as only a standard “Top Pick” for 2019.

