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.

