Foldable ramp for wheelchair access to a passenger car rear door, comprising a one-part or multi-part entry platform which can be arranged in several positions including an entry positon wherein the ramp is folded out of the car to allow wheelchair access to the car, a transport position wherein the entry platform is arranged in the car in an upright position and a passive position wherein the entry platform is arranged in the car in a lying positon； and a pivoting mechanism for mounting the platform to the passenger car, the pivoting mechanism including an interlock having a passive state in which it allows movement of the platform relative to the car and an active state in which it fixes the platform relative to at least a section of the car, the pivoting mechanism further including a safety for retaining the interlock in the active state, moving the platform from the passive position into the transport positon causes the interlock to engage the active state and the safety to activate.
