Abstract: An improved portable expandable barrier is provided which comprises a pair of fences slideably interconnected and releasably held in a desired orientation by locking means such as lock set cylinders. Preferably, one or both fences include telescoping sections releasably locked together to facilitate expansion of the barrier. In one embodiment the fences include elongated bars over which cylinders are slideably secured.Pins or screws pass through the body of the bars of each fence and into engagement with the cylinder to prevent separation of the fences. The barrier can also include one or more collapsible posts fitted with expandable internal bladders and disposed adjacent pairs of the fences. The fence perimeters are provided with means for releasably locking the fences to the posts or other structures. Such means may be adjustable suction caps, preferably protected by overlaying adjustable bell covers locked in place.