Abstract: An automatic/active/intelligent stair guide system that will allow children, elderly, disabled or frail people to use the stairs safely by acting as an instant barrier stopping a child or an elderly or frail person from falling even after they have lost their grip on the stairs. Preferably the system can be deployed in any of the three forms firstly as successive barrier(s) in front or behind anyone climbing or descending the stairs, secondly as a single or group of barriers following/tracking the person on the stairs and thirdly as foldable units located at the rungs/step of a stairway that are activated manually or automatically.