The Reclining Revolution: How Self-Driving Cars Are Forcing a Safety Rethink

A quiet revolution is brewing in the realm of automotive safety as self-driving cars become increasingly widespread. Regulators and manufacturers are being forced to reexamine long-held assumptions about how humans sit – or don’t sit – in vehicles.

For decades, safety standards have been based on the premise that occupants will always be seated upright with seatbelts securely fastened across their hips. However, this assumption is no longer tenable given the emergence of autonomous driving. The result has been a host of previously unforeseen injuries that are more debilitating than expected.

According to data from the US National Highway Traffic Safety Administration (NHTSA), 42 people have been killed in traffic crashes over the past decade while sitting with their seatbacks reclined. This number, though likely an undercount due to difficulties in identifying post-crash seating positions, highlights a critical issue: our current safety standards are woefully unprepared for the realities of autonomous driving.

Tesla’s introduction of its Robotaxi service has brought this problem into sharp focus. With its Cybercab vehicles featuring seats that can recline up to 35 degrees, passengers are free to lounge in comfort while the car takes care of the driving. However, safety concerns remain. Tesla’s own guidelines caution against excessive reclining, but as Becky Mueller, a senior research engineer at the Insurance Institute for Highway Safety (IIHS), notes, “it’s really hard to identify people who are sitting out of position” after a crash.

This issue has broader implications for all vehicles on the road. As autonomous technology advances, safety standards will need to adapt to account for changing occupant behaviors. This will require a fundamental shift in how vehicle safety testing is approached.

One possible solution lies in advanced crash-test dummies designed specifically for reclining occupants. Companies like Humanetics are working on THOR (Test device for Human Occupant Restraint) dummies that can mimic the kinds of seatbelts and seating conditions found in autonomous vehicles. These new-generation dummies will enable researchers to better understand human response kinematics and injuries under various seating conditions.

Changing safety standards won’t be easy, however. As Mueller aptly puts it, “it’s a hassle” for regulators to revisit outdated regulations. Nevertheless, with the NHTSA taking a fresh look at reclined occupants as part of its automated vehicle occupant safety research, there is hope that this archaic problem can finally be addressed.

The stakes are high: injuries sustained by passengers in non-standard seating positions – particularly those caused by seatbelts tightening around soft body parts rather than the bony pelvis – can have long-term consequences for mobility and quality of life. As we move toward a future where humans will increasingly surrender control to machines, it’s essential that our safety standards keep pace.

The industry is already taking notice, with companies like Zoox working to self-certify their vehicles while awaiting regulatory approval. However, this patchwork approach won’t suffice; a more comprehensive solution – one that prioritizes occupant safety above all else – is needed.

Ultimately, the road ahead will be long and winding, but it’s essential that we confront these challenges head-on. By rethinking our assumptions about human behavior in vehicles, we can create a safer future for all occupants – regardless of whether they’re driving or simply reclining in comfort.