Sliding step with additional folding step

Boarding and deboarding apparatus for a vehicle, comprising:

• a sliding step that is linearly movable between a retracted and extended position via actuation by a motorized drive, which at least in a partially extended position defines a first area that can be stepped upon,
• lateral guides of the sliding step for attachment to a vehicle,
• a folding step which is mounted on the sliding step so as to be pivotable between a folded-in and folded-out position and which in a folded-out position defines a second area that can be stepped upon which is parallel to the first area, and
• blocking means which prevent the folding step from pivoting between the retracted position and an intermediate position of the sliding step, and which release the pivoting of the folding step, at the latest, when the extended position of the sliding step has been reached,
• wherein said blocking means includes a housing that houses a control lever and a positive guide, said control lever being mounted on said folding step and being releasable from said blocking means upon reaching said extended position of said sliding step,
• wherein release of said control lever allows said control lever to pivot said folding step into said folded-out position via actuation of said control lever by said motorized drive along the positive guide in said housing.