Consider lift sensors that can detect thin items

Almost all present-day lifts have two door panels that close at the centre of the door frame.

The centre vertical line of the lift door frame where the two door panels meet is usually where any object, such as a dog leash, long skirt or a thin object, is caught, as multi-beam lift sensors on the sides are not able to detect the objects ("Multi-beam lift door sensors 'no guarantee' against accidents, says BCA"; ST Online, Nov 9).

Lifts should introduce vertical sensor beams - from top to bottom, at the centre, where the two lift doors close and meet - to detect thin items.

As lift safety affects more than 80 per cent of the population who live in high-rise buildings, the Building and Construction Authority should consider the feasibility of this idea.

Aaron Ang Chin Guan