Crane for lifting and transporting loads, comprising: - a base frame, for transferring the loads of the crane onto a support surface by means of a plurality of contact means in contact with said surface; - an arm for lifting and transporting loads, which is capable of rotating relative to said base frame around a vertical axis, wherein the angular range of said arm around the vertical axis comprises a plurality of angular fields (A1, A2, A3, A4, A5); - a plurality of load sensors (C1, C2, C3, C4), each load sensor (C1, C2, C3, C4) being associated with a respective contact means and for detecting the force exchanged by the respective contact means with the support surface; - a control system, for obtaining, from said load sensors (C1, C2, C3, C4), the value of the force acting upon the respective contact means, detecting the angular field (A1, A2, A3, A4, A5) where said arm is located, determining a danger condition based on the values detected by at least one of said load sensors (C1, C2, C3, C4), wherein said danger condition is determined according to different criteria in at least two different angular fields (A1, A2, A3, A4, A5), carrying out predetermined functions of the crane, if said danger condition is reached; wherein said danger condition is determined with a mathematical formula, whose variables include the values detected by at least one of said load sensors (C1, C2, C3, C4), wherein said control system uses two different formulas in at least two different angular fields (A1, A2, A3, A4, A5); characterized in that in each angular field (A1-A5) the formula is a sum of the values detected by some load sensors (C1-C4), and the result of the formula is the value of a force or of a mass; if the value of the formula exceeds or reaches a threshold value, the danger condition is reached. - a base frame, for transferring the loads of the crane onto a support surface by means of a plurality of contact means in contact with said surface; - an arm for lifting and transporting loads, which is capable of rotating relative to said base frame around a vertical axis, wherein the angular range of said arm around the vertical axis comprises a plurality of angular fields (A1, A2, A3, A4, A5); - a plurality of load sensors (C1, C2, C3, C4), each load sensor (C1, C2, C3, C4) being associated with a respective contact means and for detecting the force exchanged by the respective contact means with the support surface; - a control system, for obtaining, from said load sensors (C1, C2, C3, C4), the value of the force acting upon the respective contact means, detecting the angular field (A1, A2, A3, A4, A5) where said arm is located, determining a danger condition based on the values detected by at least one of said load sensors (C1, C2, C3, C4), wherein said danger condition is determined according to different criteria in at least two different angular fields (A1, A2, A3, A4, A5), carrying out predetermined functions of the crane, if said danger condition is reached; wherein said danger condition is determined with a mathematical formula, whose variables include the values detected by at least one of said load sensors (C1, C2, C3, C4), wherein said control system uses two different formulas in at least two different angular fields (A1, A2, A3, A4, A5); characterized in that in each angular field (A1-A5) the formula is a sum of the values detected by some load sensors (C1-C4), and the result of the formula is the value of a force or of a mass; if the value of the formula exceeds or reaches a threshold value, the danger condition is reached.