METHOD FOR MODIFYING A LIGHT SIGNAL EMITTED BY A ROAD VEHICLE AND SIGNALING DEVICE

A method of modifying an optical light signal which is to be projected from a vehicle onto a surface in the periphery of the vehicle is described, the method comprising: determining a position of an observer of the projected light signal in three-dimensional space relative to the vehicle; determining a first image to be projected onto the surface by means of the light signal; determining data representing the surface onto which the light signal is to be projected; modifying the light signal so that the image which is projected onto the surface can be visually correctly perceived as the first image by an observer based on the position of the observer and the data representing the surface. The data representing the surface comprise at least three-dimensional spatial coordinates of the surface. A computer program, a signaling device performing the method and a road vehicle are also described.