The ID.4’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Forester doesn’t offer pre-crash pretensioners.
Both the ID.4 and Forester have child safety locks to prevent children from opening the rear doors. The ID.4 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The Forester’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
The ID.4 has a standard Automatic Post-Collision Braking System, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Forester 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 ID.4 Pro S Plus has a standard Area View to allow the driver to see objects all around the vehicle on a screen. The Forester 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.
The ID.4 has a standard blind spot warning system which uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them and moves the vehicle back into its lane. A system to reveal vehicles in the Forester’s blind spot costs extra.
To help make backing out of a parking space safer, the ID.4 has a standard rear cross-path warning system, which uses sensors in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. Rear cross-path warning costs extra on the Forester and isn't available on the not available.
Both the ID.4 and the Forester have standard driver and passenger frontal airbags, front side-impact 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, daytime running lights, lane departure warning systems and rearview cameras.
The Volkswagen ID.4 weighs 697 to 1423 pounds more than the Subaru Forester. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
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 Volkswagen ID.4 is safer than the Forester:
|
ID.4 |
Forester |
Overall Evaluation |
GOOD |
ACCEPTABLE |
Structure |
GOOD |
ACCEPTABLE |
|
Driver Injury Measures |
|
Head/Neck |
GOOD |
GOOD |
Head Injury Criterion |
41 |
107 |
Neck Tension |
178 lbs. |
223 lbs. |
Neck Compression |
22 lbs. |
67 lbs. |
Torso |
GOOD |
ACCEPTABLE |
Shoulder Force |
178 lbs. |
201 lbs. |
Torso Max Deflection |
.83 in |
1.5 in |
Torso Deflection Rate |
4 MPH |
8 MPH |
Pelvis |
GOOD |
ACCEPTABLE |
Pelvis Force |
357 lbs. |
1071 lbs. |
Head Protection |
GOOD |
GOOD |
|
Passenger Injury Measures |
|
Head/Neck |
GOOD |
GOOD |
Head Injury Criterion |
243 |
544 |
Head Peak Forces |
no contact |
81 G’s |
Neck Compression |
112 lbs. |
290 lbs. |
Torso |
GOOD |
GOOD |
Shoulder Deflection |
.28 in |
2.2 in |
Shoulder Force |
112 lbs. |
469 lbs. |
Torso Max Deflection |
.71 in |
1.26 in |
Torso Deflection Rate |
4 MPH |
8 MPH |
Pelvis |
GOOD |
GOOD |
Pelvis Force |
446 lbs. |
625 lbs. |
Head Protection |
GOOD |
MARGINAL |
Instrumented handling tests conducted by the National Highway Traffic Safety Administration and analysis of its dimensions indicate that the ID.4 is 6.6% less likely to roll over than the Forester.