Abstract: A roadblock for temporary installation to block traffic and/or as a security precaution includes an elongated casing with two opposing longitudinal side walls. The two side walls join an upper wall. At least one casing support structure is located in the elongated casing and connects to both side walls. Supports for resting on the ground/surface are connected to the lower side of the elongated casing and/or the lower side of the casing support structure. Plural stabilization arms protrude from one of the longitudinal side walls and are detachable.