Over 200 people are killed each year when backed over by motor vehicles. The IS offers optional Auto Rear Braking that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The A3 doesn’t offer backup collision prevention brakes.
The IS offers an optional Panoramic View Monitor to allow the driver to see objects all around the vehicle on a screen. The A3 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.
To help make backing out of a parking space safer, the IS 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 A3.
Both the IS and the A3 have standard driver and passenger frontal airbags, front and rear side-impact airbags, 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, rearview cameras and available all wheel drive.
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 IS its highest rating: “Top Pick Plus” for 2021, a rating granted to only 75 vehicles tested by the IIHS. The A3 has not been tested, yet.