A system (100-A, 100-B, 400-A) for a vehicle, said system (100-A, 100-B, 400-A) comprising a vehicle body, a vehicle door and at least one retractable step, wherein the vehicle body encloses a passenger compartment and defines a vehicle door opening and wherein the vehicle door is moveable relative to the vehicle door opening between a closed position and an open position, wherein the at least one retractable step is connected to the vehicle door and to the vehicle body, and wherein the at least one connected retractable step is extendable from a retracted state by movement of the vehicle door in a direction from the closed position towards the open position, wherein the at least one retractable step in an extended state forms a climbing step for climbing in and/or out of the passenger compartment, wherein the at least one retractable step is arranged as a belt or arranged as connected solid plates, wherein the at least one retractable step is attached in one end to the vehicle door and wherein the at least one retractable step is adapted to be in a rest position in the vehicle body in the retracted state, characterized in that the belt is rolled up on a roller in the vehicle body in the retracted state, or wherein the connected solid plates are stacked on top of each other in a storage container connected to the vehicle body in the retracted state, in that the vehicle door comprises a detent mechanism configured for controlling a required force to close the vehicle door connected with the at least one retractable step when being in the open position, wherein the detent mechanism holding the vehicle door in the open position is configured to be controllably hard so that the vehicle door will take more force to close when the at least one retractable step is deployed in the extended state. wherein the at least one retractable step is connected to the vehicle door and to the vehicle body, and wherein the at least one connected retractable step is extendable from a retracted state by movement of the vehicle door in a direction from the closed position towards the open position, wherein the at least one retractable step in an extended state forms a climbing step for climbing in and/or out of the passenger compartment, wherein the at least one retractable step is arranged as a belt or arranged as connected solid plates, wherein the at least one retractable step is attached in one end to the vehicle door and wherein the at least one retractable step is adapted to be in a rest position in the vehicle body in the retracted state, characterized in that the belt is rolled up on a roller in the vehicle body in the retracted state, or wherein the connected solid plates are stacked on top of each other in a storage container connected to the vehicle body in the retracted state, in that the vehicle door comprises a detent mechanism configured for controlling a required force to close the vehicle door connected with the at least one retractable step when being in the open position, wherein the detent mechanism holding the vehicle door in the open position is configured to be controllably hard so that the vehicle door will take more force to close when the at least one retractable step is deployed in the extended state.