A retractable road median used to divide a road that may be retracted to allow vehicles to cross it in the event of an emergency, comprising a median assembly, a frame assembly, a winch assembly, and a longitudinal base assembly. The retractable road median has means to move the median assembly from a retraced position into an extracted position and vise versa. In the retracted position, a cavity built underneath a road surface, retractably receives the median assembly therein. The longitudinal base assembly includes two angled lateral walls that, in the extracted position, are in a substantially vertical disposition and their longitudinal edges rest on the sidewalls of the median assembly. In the retracted position, the median assembly collapses into the cavity so that the angled lateral walls rotate into a nearly horizontal position to cover the cavity entrance, permitting vehicles to cross to the other side.

A movable barricade for use in controlling vehicle travel through a traffic control locus of a security perimeter, such as the fenced-in boundary often found around a building, a plant, an industrial area, or other infrastructure. Barricades structured according to certain aspects of the invention are capable of disabling forward progress of even large cargo-carrying vehicles, such as 18-wheeled trucks and trailers, or large-capacity tanker trucks. Preferred embodiments of the invention include a high-mass barrier element, such as a concrete Jersey Barricade, adapted to be rolled into a blocking position to obstruct the flow of traffic, and rolled into an open position to permit unobstructed flow of traffic though an access control point. Certain embodiments of the invention also provide control of pedestrian traffic through the locus.

A freeway interchange traffic rerouting control system allows individual ones of the gates and signs to be operated from a workstation connected via the Internet to a web server and communications server that control spread spectrum radio transceivers. A system operator logs onto the Internet, proceeds to the interchange URL where a control panel and video screen appear. Signals may be sent from the workstation to a web server to operate the gates and to turn on advanced warning signs. Video feeds from strategically located cameras allow for viewing traffic activity at the intersection at the remote workstation. Provision is also made for detecting instances of violations whereby an alarm is given and the video detailing the violation is captured for analysis.

A traffic barrier is pivotally attached to a gate by a hinge. A cover is releasably connected to the barrier and the gate and covers the hinge. When the cover is releasably connected to the barrier and the gate it will cooperate with the barrier and gate to resist relative movement between the barrier and gate at the hinge location.

A highway crash attenuator frame includes transverse elements that are interconnected by side elements. Each side element is disposed entirely on a respective side of a central longitudinal axis of the frame, and one or more tension elements are secured to the side elements to extend between the side elements across the longitudinal axis. Each tension element includes a mechanical fuse operative to fail in tension when the first and second side elements supply an excessive tensile load to the tension element. When the mechanical fuse fails in tension in an impact, the side elements are simultaneously released to move outwardly, away from the longitudinal axis, and thereby to collapse in a way which is coordinated between the left and the right sides of the frame.