The 3 Series Sedan’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The ES doesn’t offer pre-crash pretensioners.
The 3 Series Sedan has standard Active Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Head Restraints system moves the headrests forward to prevent neck and spine injuries. The ES doesn’t offer a whiplash protection system.
Both the 3 Series Sedan and the ES have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, rearview cameras, driver alert monitors, available all wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the BMW 3 Series Sedan is safer than the Lexus ES:
|   
  | 
     3 Series Sedan  | 
     ES  | 
  
|   OVERALL STARS  | 
     5 Stars  | 
     4 Stars  | 
  
|   
  | 
     Driver  | 
  |
|   STARS  | 
     5 Stars  | 
     5 Stars  | 
  
|   Neck Injury Risk  | 
     23%  | 
     24%  | 
  
|   Neck Stress  | 
     207 lbs.  | 
     239 lbs.  | 
  
|   Leg Forces (l/r)  | 
     201/230 lbs.  | 
     524/628 lbs.  | 
  
|   
  | 
     Passenger  | 
  |
|   STARS  | 
     5 Stars  | 
     4 Stars  | 
  
|   HIC  | 
     252  | 
     319  | 
  
|   Chest Compression  | 
     .6 inches  | 
     .8 inches  | 
  
|   Neck Injury Risk  | 
     33%  | 
     33%  | 
  
|   Leg Forces (l/r)  | 
     200/338 lbs.  | 
     473/518 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 flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the BMW 3 Series Sedan is safer than the Lexus ES:
|   
  | 
     3 Series Sedan  | 
     ES  | 
  
|   
  | 
     Front Seat  | 
  |
|   STARS  | 
     5 Stars  | 
     5 Stars  | 
  
|   Hip Force  | 
     252 lbs.  | 
     264 lbs.  | 
  
|   
  | 
     Rear Seat  | 
  |
|   STARS  | 
     5 Stars  | 
     5 Stars  | 
  
|   Hip Force  | 
     532 lbs.  | 
     541 lbs.  | 
  
|   
  | 
     Into Pole  | 
  |
|   STARS  | 
     5 Stars  | 
     5 Stars  | 
  
|   Max Damage Depth  | 
     13 inches  | 
     13 inches  | 
  
|   HIC  | 
     270  | 
     326  | 
  
|   Hip Force  | 
     544 lbs.  | 
     570 lbs.  | 
  
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.
Instrumented handling tests conducted by the National Highway Traffic Safety Administration and analysis of its dimensions indicate that the 3 Series Sedan, with its five-star roll-over rating, is 1.3% less likely to roll over than the ES, which received a four-star rating.

