By the mechanism rather than by supervision.

Speed limitation is built into the bearing or drive.

The platform cannot exceed a controlled rate.

How hard it is pushed makes no difference.

Older designs relied on children self-regulating.

Confirm the limiter is inherent, not an add-on.

They remove the gap beside a moving platform.

The deck sits flush with the surface.

Entrapment under a raised platform is the risk they avoid.

They need no step to reach.

Maintenance access is simpler.

They also suit inclusive layouts directly.

On a flush ground-level unit, yes.

The chair rolls straight onto the platform.

A restraint or wheel lock is usually provided.

Few moving items can be shared this way.

That is why inclusive schemes use them heavily.

Raised platforms cannot offer the same.

It follows how the child holds on.

Seated units with backs suit younger children.

They cannot grip for long periods.

Standing dishes suit older children.

Those users generate their own speed.

Orbital designs add tilt for the oldest group.

The bearing, almost entirely.

Sand and grit collect under a busy carousel.

Sealed bearings tolerate that; open ones do not.

A seized bearing takes the unit out of service.

Ask how the bearing is sealed.

Ask how it is replaced in situ.

Mostly around and under the platform.

The gap beside a moving deck is the concern.

Clearance to surrounding equipment is also set.

Requirements differ between regional standards.

Certification should name the standard applied.

Ask for the test report rather than a claim.

Bearing condition and platform fixings.

Listen for roughness as well as looking.

Surfacing displaces around a busy unit.

Check the gap has not opened up.

Restraints and grab rails need checking too.

Frequency follows usage rather than the calendar.