The Missing Bulkhead

Here is the fact that makes private loading more dangerous than it feels, and in one specific respect worse than a lorry.

A commercial vehicle typically has a headboard or bulkhead — a structural barrier between the load and the cab, built to stop cargo entering the driver's space. Your car has a fold-down seat and a headrest. In a hard stop, a heavy item in the boot can come through the rear seats into the passenger compartment, and the seat-back is padding, not structure.

Apply the force rule: an object carries 80% of its weight forward in a hard stop. A 20 kg toolbox hits with roughly 16 kg of force — and it does so at head height, travelling at the speed the car was doing.

This extends to everything loose inside the cabin, which drivers almost never think of as load:

• the toolbox or laptop bag on the back seat,
• the gas cylinder in the boot of a hatchback with the seats down,
• the water bottles, tools and shopping in the footwell or parcel shelf.

Each is a projectile in a hard stop. Which is why The Daily Check's "uncluttered cabin" point is not about tidiness: a clean cabin is a cabin with nothing in it to hit you. Heavy items belong in the boot, against the seat-back, low — never on a seat, a parcel shelf or a lap.