Safety vestibules shall be provided for each inmate housing area and day room used for confinement of three or more inmates. No more than four cells shall be served by one vestibule. All entrances through the security perimeter from administrative and/or public areas shall be provided with a safety vestibule.
  (1) Safety vestibules shall have one or more interior doors and a main entrance door.
  (2) Interior doors shall be arranged to be locked and unlocked by control means located outside of the inmate living area and safety vestibule.
  (3) Where doors have an interlocking security feature, provisions shall be made for an override capability in the event an emergency requires both doors to be opened simultaneously.

Source Note: The provisions of this §259.744 adopted to be effective April 4, 1999, 24 TexReg 2355