A foldable ramp for wheelchair access to a passenger car door, can include an entry platform which can be arranged an entry positon where the ramp is folded out of the car to allow wheelchair access to the car, a transport position where the entry platform is arranged in the car in an upright position, and a passive position where the entry platform is arranged in the car in a lying positon. The ramp can include a pivoting mechanism to mount the platform to the car, and can include an interlock configured to allow movement of the platform relative to the car and fix the platform relative to at least a section of the car.