An aerial electricity-supplying assembly, to be disposed close to a road where a ground vehicle circulates or is stationary, intended to supply electrical power temporarily to this ground vehicle while it is passing by or stationary, this assembly being mounted on a fixed base, such as a pole, a column, a façade or other structure, and comprising one or more polar pieces for electrical contact by dormant or sliding friction, intended to come into contact for delivery of electrical power with at least one electricity-collecting element of a collecting structure carried by the upper part of the ground vehicle, characterized in that it is provided with the following means: • a fixed part functioning as support; • a movable or deformable part intended to be mechanically and automatically moved or deformed upward under the effect of a mechanical constraint caused by the arrival of the vehicle or by its presence facing the supply assembly; • one or more friction members carried by the movable or deformable part in the form of one or more polar pieces extending in a plane substantially perpendicular to the road; • a link between the fixed part and the movable or deformable part of the assembly, intended for automatic displacement of the friction members between a rest position in the absence of contact between the friction members and the collecting structure carried by the vehicle, and an electricity-supplying contact position when the friction members are in contact with the collecting structure carried by the vehicle during the presence of the moving or stationary vehicle facing the supply assembly and vice versa; • an electrical termination assembly for automatically supplying the friction members which supplies the friction members only upon arrival of the vehicle or during its presence facing the supply assembly; and in that the upward mechanical and automatic moving or deformation of the movable or deformable part powers the friction members, whereas the return of the movable or deformable part in its rest position and the friction members power cutting are automatic after passage of the vehicle. • a fixed part functioning as support; • a movable or deformable part intended to be mechanically and automatically moved or deformed upward under the effect of a mechanical constraint caused by the arrival of the vehicle or by its presence facing the supply assembly; • one or more friction members carried by the movable or deformable part in the form of one or more polar pieces extending in a plane substantially perpendicular to the road; • a link between the fixed part and the movable or deformable part of the assembly, intended for automatic displacement of the friction members between a rest position in the absence of contact between the friction members and the collecting structure carried by the vehicle, and an electricity-supplying contact position when the friction members are in contact with the collecting structure carried by the vehicle during the presence of the moving or stationary vehicle facing the supply assembly and vice versa; • an electrical termination assembly for automatically supplying the friction members which supplies the friction members only upon arrival of the vehicle or during its presence facing the supply assembly;