For enhanced safety, the front and second-row seat shoulder belts of the Hyundai Ioniq 9 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 VinFast VF 9 doesn’t offer pretensioners for its second-row seat belts.
For enhanced safety, the front seat shoulder belts of the Hyundai Ioniq 9 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The VinFast VF 9 doesn’t offer height-adjustable seat belts.
In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the Ioniq 9 are reminded to check the back seat when a sensor determines the back seat is occupied. The VF 9 doesn’t offer a back seat reminder.
When descending a steep, off-road slope, the Ioniq 9’s standard Downhill Brake Control allows you to creep down safely. The VF 9 doesn’t offer Downhill Brake Control.
Both the Ioniq 9 and VF 9 have rear cross-traffic warning, but the Ioniq 9 has Rear Cross-Traffic Collision-Avoidance Assist (automatically applies the brakes) to better prevent a collision when backing near traffic. The VF 9’s Rear Cross Traffic Alert doesn’t automatically brake.
Both the Ioniq 9 and the VF 9 have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver knee airbags, front seat center airbag, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors and available around view monitors.