5. The portable barrier of claim 1, further comprising an additional side opening cover configured to be movable between an expanded configuration and a collapsed configuration,
wherein, when said portable barrier is positioned in said protection mode, said portable barrier defines an additional side opening configured to provide access to said occupant space, and
wherein, when (i) said portable barrier is positioned in said protection mode, and (ii) said additional side opening cover is positioned in said extended configuration, said additional side opening cover is positioned to cover at least a portion of said additional side opening.