Assessment of Visual Effectiveness of Metro Evacuation Signage in Fire and Flood Scenarios: A VR-Based Eye-Movement Experiment

Emergency evacuation signage in metro stations plays a critical role in guiding occupants to evacuate quickly and safely. However, variations in placement height and other display attributes can affect the perceptual efficiency of signage. This study takes a metro station in Changsha, China, as an example and constructs two virtual disaster scenarios—fire and flood. An eye-tracking experiment was designed and conducted, yielding 164 valid experimental samples (89 fire, 75 flood). We compared the visual effectiveness of signage at three heights: low (0–0.8 m), medium (0.8–2 m), and high (>2 m). The results indicate that (1) low-position signage exhibits superior immediacy and should be prioritized for emergency response; (2) medium-position signage strikes a balance between perceived importance and immediacy, serving effectively as central nodes for both routine and emergency purposes; (3) high-position signage presents significant advantages in perceived importance and is suitable for conveying comprehensive, multi-level evacuation information. This research provides empirical evidence for optimizing the spatial layout of emergency evacuation signage in metro stations, offering valuable guidance for enhancing emergency evacuation capabilities in subway environments.