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A barrier system for use with a trafficable surface that penetrates a boundary to control access by vehicles and to permit uncontrolled access by pedestrians. The system includes a turntable providing a surface that is rotatable generally in the plane of the trafficable surface. Impact elements are

A barrier system for use with a trafficable surface that penetrates a boundary to control access by vehicles and to permit uncontrolled access by pedestrians. The system includes a turntable providing a surface that is rotatable generally in the plane of the trafficable surface. Impact elements are arranged along the surface in a pattern having a spacing configured to permit passage by pedestrians and to prevent passage of vehicles when the turntable is in a first position and to permit passage of vehicles when the turntable is rotated to a second position. The system controls vehicle traffic across the boundary by moving the turntable between the first position and the second position.

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What is claimed is: 1. A turntable barrier system for use with a roadway for controlling passage of a vehicle, comprising: a turntable having a top surface generally coplanar with the roadway and rotatably movable about a vertical axis, such that said top surface of said turnable is rotated in a pl

What is claimed is: 1. A turntable barrier system for use with a roadway for controlling passage of a vehicle, comprising: a turntable having a top surface generally coplanar with the roadway and rotatably movable about a vertical axis, such that said top surface of said turnable is rotated in a plane substantially parallel to a plane of the roadway; an array of impact elements disposed on the turntable and extending from the top surface of the turntable; a power operated drive system that is actuatable to rotate the turntable the turntable being rotatable between a first position where the array of impact elements are configured to prevent passage of a vehicle and a second position where the row of impact elements are configured to permit passage of the vehicle. 2. The system of claim 1 wherein the turntable is generally circular. 3. The system of claim 2 wherein the row of impact elements is arranged along a chord of the turntable so that the chord is bisected by a radius of the platform. 4. The system of claim 2 wherein the row of impact elements is arranged along a diameter of the turntable. 5. The system of claim 2 wherein the row of impact elements is arranged along an arc on the turntable. 6. The system of claim 1 wherein a spacing between impact elements in the row of impact elements is sufficient to permit passage of pedestrians and sufficient to restrict passage of vehicles. 7. The system of claim 6 wherein the spacing between impact elements is configured to prevent passage of pedestrians and vehicles. 8. The system of claim 1 wherein the impact elements comprise one or any combination of a material selected from the group consisting of a reinforced concrete, a metal, cement, stone, wood and a plastic. 9. The system of claim 1 wherein the row of impact elements are configured to be substantially collinear with a row of stationary impact elements adjacent to the turntable. 10. The system of claim 1 wherein the drive system comprises a motor that is operable to rotate the turntable when the drive is actuated from a location remote from the turntable, and the drive system is operable to permit manual rotation of the turntable. 11. The system of claim 10 wherein the turntable is manually rotatable between the first position and the second position. 12. The system of claim 1 wherein the impact elements are inertial impact elements removably placed on the top surface of the turntable. 13. The system of claim 1 wherein the turntable further comprises a movable portion configured for rotation about a stationary portion and the impact elements are arranged on the movable portion. 14. The system of claim 1 wherein the impact elements are fixed to the turntable . 15. The system of claim 1 wherein the turntable comprises a plurality of individually removable sections. 16. The system of claim 1 further comprising a cover layer comprising one or a combination of material selected from the group consisting of asphalt, concrete, brick, stone, cobble, metal plate, metal grating, tile, wood, rubber, plastic and glass. 17. The system of claim 1 wherein the turntable rotates approximately 90 degrees between the first position and the second position. 18. A barrier system for use with a trafficable surface that penetrates a boundary to control access by vehicles and to permit uncontrolled access by pedestrians, the system comprising: a turntable providing a top surface that is rotatable generally in a plane of the trafficable surface; a series of impact elements arranged along the surface in a pattern having a spacing configured to permit passage by pedestrians and to prevent passage of vehicles when the turntable is in a first position and to permit passage of pedestrians and vehicles when the turntable is rotated to a second position; so that a drive system for rotating said turntable vehicle traffic across the boundary can be controlled by moving the turntable between the first position and the second position. 19. The system of claim 18 wherein the impact elements are arranged to maintain a substantially continuous barrier with the boundary when the turntable is in the first position. 20. The system of claim 18 wherein the impact elements are arranged to create an opening in the boundary having a width sufficient for passage of vehicles when the turntable is in the second position. 21. The system of claim 18 wherein the trafficable surface is a ground surface and the top surface comprises a cover having soil and plantings. 22. The system of claim 18 wherein the turntable is structurally integrated with the impact elements. 23. The system of claim 18 wherein the impact elements are removably positioned on the turntable. 24. The system of claim 23 wherein the impact elements are inertia type impact elements. 25. The system of claim 18 wherein the impact elements are connected to the turntable. 26. The system of claim 18 wherein the impact elements have a height sufficient to contact a chassis portion of a vehicle. 27. The system of claim 18 wherein the impact elements have a crash barrier rating of K or L rating an L rating.