What are tactile warning strips?

• A. Sharp metal rails embedded in the platform.
• B. Textured strips on platform edges to alert visually impaired passengers of the platform boundary.
• C. A painted line indicating safe distance.
• D. Audible announcements only.

Answer: (B)

Tactile warning strips are textured surfaces placed along the edge of a train platform that you can feel underfoot or with a cane. They use raised patterns (like domes or ridges) to create a noticeable change in texture, signaling to visually impaired passengers that they’re near the platform boundary and should stop or proceed with caution. This tactile cue provides a non-visual warning that doesn’t rely on sight or sound, improving safety for those who can’t rely on colors or audio alone. The option described matches exactly this purpose: textured strips on platform edges to alert about the boundary. Sharp metal rails would be dangerous and are not designed as warnings; a painted line is visible but not detectable by touch; audible announcements are not tactile cues.