“Zero-gravity” sounds like something that belongs in space.

Or in Interstellar, where astronauts float inside the Endurance and a short stop on one planet costs seven years back home.

But in today’s cars, zero-gravity usually means a seat that reclines deeply and supports the legs. The passenger no longer looks seated; he looks like someone waiting for room service.

It is a good sales pitch because everybody knows how tiring heavy traffic and long drives can be. 

But China is now studying the safety risks of so-called zero-gravity seats in electric vehicles.

According to Reuters, China’s industry ministry said occupant safety in a collision may not be guaranteed when these seats are used in a semi-reclined position. 

The proposed rules cover vehicle seats, head restraints and battery recycling, with public comment open until 25 July.

The concern is not the seat itself but how it is used while the vehicle is moving.

Seatbelts, airbags and head restraints are designed around a proper seating position. Recline too far and the safety system may no longer work the same way.

That is the problem with turning the cabin into a lounge.

A lounge makes sense when the vehicle is parked, or while waiting, charging or resting. A moving car is not a hotel room with wheels.

It is still a machine traveling beside buses, trucks, motorcycles, barriers and other drivers who may also be tired or distracted.

Many Filipino buyers value comfort because traffic is slow and the heat can be brutal. A cooled seat and a better backrest are easy to appreciate.

But comfort should come with a clear warning.

If a deep-recline mode is meant only when parked, buyers should know that before they start using it on the road.

Dealers should explain it and brands should say it clearly, not be buried in a manual that only gets opened when the owner is looking for the tire pressure chart.

Marketing should not only show how far a seat can recline. It should also say when that position is safe to use.

This is not an argument against better seats. We all welcome them. Drivers and passengers deserve more comfortable cabins.

The seat has two jobs. When the car is parked, it can pamper. When the car is moving, it must protect. 

I am almost reminded of the police motto “to protect and to serve,” except this one has lumbar support.

A car seat can now have more buttons, motors, massage functions, cooling and heating settings.

But once the vehicle moves, the basic rule remains.

Comfort is welcome. Protection comes first.