How do blind or partially sighted people know they are reaching the last step on a flight of stairs?

Trying to determine which is the last step on a flight of stairs can be very awkward for people with visual impairments; especially in a busy environment like an office or shopping centre or a fire exit in an emergency situation. That is why we developed our "tactile hand-rail step indicators", and because we produce them in metal, they can be formed to fit over round, as well as flat, handrails.