A safety system for a vehicle seat in a commercial vehicle operating a vehicle seat motion actuation when the commercial vehicle is colliding with an obstacle, comprising: —at least one actuator unit that comprises at least one seat actuator to move the vehicle seat from a driving position to a safety position—at least one control unit connected to said actuator unit to control the at least one seat actuator—at least one proximity sensor connected to said control unit and configured to detect an obstacle before the commercial vehicle collides it characterized in that the control unit is provided with a calculator device retrieving specific data (Dw, Dw′, Ds, Do) to determine the requested seat's motion speed profile and the requested seat's motion triggering moment to control, upon receiving an imminent and unavoidable collision alert signal from the proximity sensor, the at least one seat actuator to move the vehicle seat to the safety position.