Abstract: A device to block car parking spaces comprising a collapsible gate and a collapsible anchoring post; the gate comprises a flat structure including at least one pole and a crossbar mutually perpendicular to one another, the pole being pivotally jointed at its bottom end to a base plate affixed to the ground and affixed at its top end to the crossbar which is parallel to the jointing axis of the pole; the anchoring post is pivotally jointed at its base to a base plate by an axis perpendicular to the axis of the base plate for the pole; and the crossbar is of such length as to rest with one of its free ends on the free end of the anchoring post when the post and gate are in a vertical position. A blocking lock is provided at the mutual points of support of the crossbar and post.