A method for exchanging of information in an intelligent transport system between a plurality of intelligent transport system stations (ITS-Ss) in said intelligent transport system (ITS) uses a wireless communication channel. The exchanging of information comprises composing, transmitting, receiving and/or decoding at least part of ITS messages at and/or between said plurality of ITS-Ss, wherein each of said plurality of intelligent transport system stations (ITS-Ss) comprises at least one sensor arranged to perceive, for example in the form of objects and/or free-space, in at least one geographical area within said traffic environment, is arranged to act both as a sender ITS-S and a receiver ITS-S, and is arranged to use, as said ITS messages, collective perception messages (CPMs) containing at least information about the perception within a traffic environment. The method comprises the steps of sending, from an ITS-S acting as a sender ITS-S, an area perception request (APR) corresponding to a geographical area of interest, and requesting perception information from another ITS-S capable of perceiving in said geographical area; and receiving, from said another ITS-S, the requested perception information in a subsequent CPM of said another ITS-S. An intelligent transport system and a computer-implemented system corresponding to this method are also provided.