Abstract: Disclosed is a system for managing collision avoidance of a first crane on a work site on which a second crane is located, the second crane being mobile, the system comprising: —a collision avoidance system of the first crane, configured so as to prevent a collision between the first crane and its environment; —a communication device configured to receive from the second crane an indication of the position of the second crane on the work site and to send to the second crane a confirmation of receipt of the indication of the position of the second crane on the site, when the indication of the position of the second crane corresponds to a distance, relative to the the first crane, less than or equal to a first threshold value Zc; —a collision avoidance management module of the first crane, configured so as to activate the collision avoidance system of the first crane when the indication of the position of the second crane corresponds to a distance, relative to the first crane, less than or equal to a second thr

Abstract: A system for managing working modes of a mobile crane in a job site, the system comprising: a position sensor for the mobile crane in the job site, a position sensor for the hook of the mobile crane relative to a reference point of said mobile crane, a module for managing the working mode of the mobile crane configured to define the working mode of the mobile crane selected from: the “displacement” mode corresponding to a displacement of the mobile crane in the job site, the “fixed work” mode corresponding to a situation in which the mobile crane is fixed in the job site and the position of its hook is variable, a communication device configured to communicate an indication of the working mode of the mobile crane to at least one other crane of the job site.