One or more techniques and/or systems are disclosed for alerting workers in a work zone of a potential intrusion by a vehicle. The example system can comprise a detection unit operable to mount to a work zone boundary marker. The detection unit monitors the work zone for intrusion by moving objects using the Doppler Effect. The detection unit can transmit an alarm signal to one or more personnel alerters, such as worn by workers. The personnel alerters can receive the alarm signal and activate an alert, such as an audible, visual, or other sensory alert. In this way, an alert is provided to personnel working in an established work zone that a moving object, such as a vehicle, has penetrated the work zone perimeter. This type of alert may provide the personnel the vital seconds needed to move to safety.

One or more techniques and/or systems are disclosed for alerting workers in a work zone of a potential intrusion by a vehicle. The example system can comprise a detection unit operable to mount to a work zone boundary marker. The detection unit monitors the work zone for intrusion by moving objects using the Doppler Effect. The detection unit can transmit an alarm signal to one or more personnel alerters, such as worn by workers. The personnel alerters can receive the alarm signal and activate an alert, such as an audible, visual, or other sensory alert. In this way, an alert is provided to personnel working in an established work zone that a moving object, such as a vehicle, has penetrated the work zone perimeter. This type of alert may provide the personnel the vital seconds needed to move to safety.

A retractable cylindrical safety marker is provided. The retractable cylindrical safety marker includes a base, having a middle section defining an upper planar surface and two opposing edges; a first end section rotatably attached at an end to one of the opposing edges; and a second end section rotatably attached at an end to the other of the opposing edges, and a vertical riser, having a lower riser having a lower end attached to the first end section and the second end section, the lower riser having a slot extending along its interior surface in the longitudinal direction; and at least one upper riser concentrically positioned within the lower riser, the upper riser having a tab positioned on an outer surface thereof, the tab being mateable with the slot and configured to permit the tab to translate along the slot.

A retractable cylindrical safety marker is provided. The retractable cylindrical safety marker includes a base, having a middle section defining an upper planar surface and two opposing edges; a first end section rotatably attached at an end to one of the opposing edges; and a second end section rotatably attached at an end to the other of the opposing edges, and a vertical riser, having a lower riser having a lower end attached to the first end section and the second end section, the lower riser having a slot extending along its interior surface in the longitudinal direction; and at least one upper riser concentrically positioned within the lower riser, the upper riser having a tab positioned on an outer surface thereof, the tab being mateable with the slot and configured to permit the tab to translate along the slot.

The invention discloses an ejection type safety warning sign for car, having a polyhedral structure for suppressing tumbling in a free state, capable of being restrained into tubular storage state by external force, and automatically releasing as polyhedral structure when external force disappears; polyhedral structure having warning marker on surface. A ejection system comprises: warning sign; launch tube having inner cavity for accommodating warning sign in tubular storage state; pressure tank communicated with end of launch tube; solenoid valve disposed between launch tube and pressure tank; controller connected to solenoid valve; launch tube having piston for pushing warning sign. When sudden situation occurs during driving, driver can press ejection button of warning sign while braking, so that warning sign can be ejected and stays near position of braking. Location of warning sign is at distance from position parking, eliminating take warning sign, promptly alerting rear car, reducing rear-end accidents.

The invention discloses an ejection type safety warning sign for car, having a polyhedral structure for suppressing tumbling in a free state, capable of being restrained into tubular storage state by external force, and automatically releasing as polyhedral structure when external force disappears; polyhedral structure having warning marker on surface. A ejection system comprises: warning sign; launch tube having inner cavity for accommodating warning sign in tubular storage state; pressure tank communicated with end of launch tube; solenoid valve disposed between launch tube and pressure tank; controller connected to solenoid valve; launch tube having piston for pushing warning sign. When sudden situation occurs during driving, driver can press ejection button of warning sign while braking, so that warning sign can be ejected and stays near position of braking. Location of warning sign is at distance from position parking, eliminating take warning sign, promptly alerting rear car, reducing rear-end accidents.

A mobile spread-out separating and protecting barrier consisting of air-filled side walls and a base, characterized in that at least two side walls (1) are hinged together in the upper part and connected with at least one plane that constitutes the base (2), wherein the side walls (1) preferably have at least one hole (3)

Disclosed herein are embodiments of a portable sign for removable disposition about a traffic control device, and methods of making and using such a portable sign, whereby the portable sign includes a sleeve having sleeve outer and inner surfaces, the sleeve inner surface defining a sleeve opening configured to removably receive the traffic control device; a panel coupled to the sleeve in overlaying engagement; and an information-conveying indicium coupled to the panel, for example an information-conveying indicium associated with the traffic control device.

Disclosed herein are embodiments of a portable sign for removable disposition about a traffic control device, and methods of making and using such a portable sign, whereby the portable sign includes a sleeve having sleeve outer and inner surfaces, the sleeve inner surface defining a sleeve opening configured to removably receive the traffic control device; a panel coupled to the sleeve in overlaying engagement; and an information-conveying indicium coupled to the panel, for example an information-conveying indicium associated with the traffic control device.

A device includes a cone having a cone first end with a flange, the cone extending to a cone second end. A base has a recess to mate with the flange of the cone. The base also has multiple base openings. A ring is shaped to fit on top of the flange and has multiple ring openings to mate with the base openings in a top of the base for releasably coupling the cone to the base.