26 39 which after the pre set time delay energizes motor control unit 18 to operate motor 19 to open the outer doors outwardly therefore it can be seen that the doors swing inwardly or outwardly with respect to the vestibule depending on whether a person is entering or leaving it the motor control units 18 and 21 being designed to operate the outer and inner doors to swing either inwardly or outwardly respectively the red and green traffic control lights are of course integrated into the circuit of fig5 in a manner not shown within the skill of a person familiar with the art so that they are coordinated with the other operating features in the normal sequence a different circuit than that shown in fig6 could also be designed to carry out the above sequence of operation in order to utilize the invention the security doors of this invention may also be used as double units where they are positioned side by side as shown in fig1 and in the double unit sequence of operation shown in fig5 in this embodiment the operating sequence is the same as shown for a single unit and as in fig6 except that in normal operation there is always one way traffic through each unit one being used for entrance and the other being used for exit this embodiment obviously avoids any possibility of traffic congestion due to two way traffic through a single unit in the event a person has gained access to the interior of a building or office establishment and committed a theft burglary robbery or some other crime.