A driver places a young child on their lap in the front passenger seat for a short trip and fastens only their own belt. What is wrong with this?

Why A is correct

The physics are unforgiving and they operate at city speeds. In a collision at even modest velocity the forces acting on a small child reach many times body weight, far beyond what any pair of arms can retain, and the child becomes a projectile against the dashboard, the door or the adult themselves. An airbag makes it worse rather than better: deploying bags are designed around adult skeletons, and a child seated close to one faces severe head and neck injury. Rear-facing restraints exist because an infant's head is disproportionately heavy and the spine cannot yet carry it facing forward.

Why the other options are wrong

B. It is acceptable for trips entirely within city limits

Distance is irrelevant to crash forces. A large share of collisions involving children happen close to home, which is exactly why short trips are not exempt.

C. It is acceptable provided the airbag has been deactivated

Deactivating the bag removes one hazard and leaves the larger one untouched. An unrestrained child still travels forward at the speed the car was doing before impact.

D. Nothing, provided the driver is belted and drives carefully

Careful driving cannot defeat inertia. The belt is the thing that holds people during the fraction of a second when the car decelerates and everything loose inside it keeps travelling forwards.

On the road

Two adults in front, a child on a lap, a sober driver, a residential street, and somebody running a stop sign. Everything the adults believed would protect the child was really a decision about where to sit. Nobody in that car intended harm to anybody, and intent has no bearing at all on what the crash forces do in the following half second.

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