Abstract: An access control booth 10 includes a housing 12 having a base member 26, a roof member 28 and a side wall portion 30 extending between the base member 26 and the roof member 28, the side wall portion 30 having a circular inner plan profile to define a pair of opposed arcuate access openings 14, 16. A pair of counter-pivoted arcuate members 20, 24 close the access openings 14, 16, respectively. Each arcuate member 20, 24 has a first arm pivotally mounted within the roof member 28, a second arm pivotally mounted beneath the base member 26 and an arcuate wall portion extending between the first arm and the second arm. A torsion-bar assembly is connected to the first arm and the second arm of each arcuate member 20, 24 for inhibiting twisting of the arcuate member 20, 24 as it pivots, the torsion-bar assembly being arranged inwardly of the arcuate wall portion of the arcuate member 20, 24.