Collapsible smart speed bump for reducing the speed of vehicles, of the variety that may be adjusted between a minimum and maximum height, comprising: - a platform arranged across the road, which can move upwards and downwards vertically, driven by - an elevation mechanism, which is arranged under the platform and which, in turn, is connected, by means of a transmission system to - an actuation system, which enables the speed bump to move and is controlled by - an electric cabinet, the elevation mechanism comprising in turn: - a fastener arranged in the longitudinal direction of the platform, which, driven by the actuation system by means of the transmission system, is displaced across the road, - at least a first wedge fixed outside the fastener with its inclined face arranged longitudinally in the direction of the fastener, which comes into contact with - the inclined face of at least a second wedge attached to the inside of the mechanisms box, which houses the elevation mechanism, transforming the longitudinal movement of the fastener into a vertical movement of the platform, said collapsible smart speed bump characterised in that - the elevation mechanism comprises: o a first upper wedge arranged in the upper portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second upper wedge attached in the upper part of the inside of the box and o a first lower wedge arranged in the lower portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second lower wedge attached to the lower part of the inside of the box, transforming the longitudinal movement of the fastener into a vertical movement of the platform, and in that - the wedges (24, 25, 26 and 27) are angled at a tangent smaller than the friction coefficient of the material with which the surface of said wedges (24, 25, 26 and 27) is made. - a platform arranged across the road, which can move upwards and downwards vertically, driven by - an elevation mechanism, which is arranged under the platform and which, in turn, is connected, by means of a transmission system to - an actuation system, which enables the speed bump to move and is controlled by - an electric cabinet, - a fastener arranged in the longitudinal direction of the platform, which, driven by the actuation system by means of the transmission system, is displaced across the road, - at least a first wedge fixed outside the fastener with its inclined face arranged longitudinally in the direction of the fastener, which comes into contact with - the inclined face of at least a second wedge attached to the inside of the mechanisms box, which houses the elevation mechanism, transforming the longitudinal movement of the fastener into a vertical movement of the platform, - the elevation mechanism comprises: o a first upper wedge arranged in the upper portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second upper wedge attached in the upper part of the inside of the box and o a first lower wedge arranged in the lower portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second lower wedge attached to the lower part of the inside of the box, transforming the longitudinal movement of the fastener into a vertical movement of the platform, and in that o a first upper wedge arranged in the upper portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second upper wedge attached in the upper part of the inside of the box and o a first lower wedge arranged in the lower portion of the fastener, with its inclined face arranged longitudinally in the direction of said fastener, which comes into contact with the inclined face of at least a second lower wedge attached to the lower part of the inside of the box, transforming the longitudinal movement of the fastener into a vertical movement of the platform, and in that - the wedges (24, 25, 26 and 27) are angled at a tangent smaller than the friction coefficient of the material with which the surface of said wedges (24, 25, 26 and 27) is made.