The effects of glass stairways on stair users: An observational study of stairway safety

Abstract The purpose of this study was to assess the safety of a winding glass stairway by observing the behavior of stair users and to identify issues that should be studied in a laboratory setting. A checklist for coding stair use behaviors was developed. Video observations were conducted in a retail store with a glass stairway (GS) and a shopping mall with a conventional stairway (CS). Key behaviors related to safety (tread gaze, diverted gaze, handrail use) and stair incidents on the two stairways (GS and CS) were identified from the recordings and compared. On the glass stairway, more users glanced down at the treads (GS: 87% vs. CS: 59%); fewer users diverted their gaze away from the stairs (GS: 54% vs. CS: 67%); and handrail use was higher (GS: 32% vs. CS: 24%). Incident rates were much higher on the glass stairway (6.2%) compared to the conventional stairway (0.7%). Walking on winding treads made of glass may be more dangerous than walking on conventional materials due to reduced visibility of the tread edge or reduced friction between shoes and treads. Recent laboratory research suggests that stairway users may behave more cautiously using stairways with glass treads but the results from this study demonstrate that the benefit of increased caution can be negated in real world conditions.