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 safety stanchion includes a base. A post extends from the base. A belt reel has an interior for holding the belt. A belt is retractably mounted within the interior. The belt has an electroluminescent (EL) material operatively connected to a powersource. The electroluminescent (EL) material is visible to the general public, when extended form within the interior.

A safety stanchion includes a base. A post extends from the base. A belt reel has an interior for holding the belt. A belt is retractably mounted within the interior. The belt has an electroluminescent (EL) material operatively connected to a powersource. The electroluminescent (EL) material is visible to the general public, when extended form within the interior.

A warning device includes a supporting unit, a plurality of supporting frames pivotally connected to the supporting unit, and a warning unit. The warning unit is mounted to the supporting frames and configured to be driven by a slide seat of the supporting unit, via the supporting frames, to be in an expanded state when a distal end portion of each of the supporting frames is at an expanded position, and to be in a collapsed state when the distal end portion of each of the supporting frames is at a collapsed position. The warning unit includes at least one warning member made of a flexible material, and defining a hollow region when the warning unit is in the expanded state.

A warning device includes a supporting unit, a plurality of supporting frames pivotally connected to the supporting unit, and a warning unit. The warning unit is mounted to the supporting frames and configured to be driven by a slide seat of the supporting unit, via the supporting frames, to be in an expanded state when a distal end portion of each of the supporting frames is at an expanded position, and to be in a collapsed state when the distal end portion of each of the supporting frames is at a collapsed position. The warning unit includes at least one warning member made of a flexible material, and defining a hollow region when the warning unit is in the expanded state.

In some examples, a computing device may store a temporary traffic control zone compliance set (TTCZCS) comprising a set of indications of traffic control features for a temporary traffic control zone, wherein the set of indications of traffic control features represent that the temporary traffic control zone is compliant with at least one criterion; receive a set of indications of infrastructure articles from a set of sensors that detect the infrastructure articles in the traffic control zone; detect non-compliance of the at least one criterion based on an indication at least one infrastructure article in the temporary traffic control zone and at least one indication of a traffic control feature that corresponds to the infrastructure article; and perform at least one operation based on detection of the non-compliance of the at least one criterion for the temporary traffic control zone.

A lighting device may include a body including a front cavity and a back cavity, and a bottom face between the front cavity and the back cavity. The lighting device may also include multiple lights, with at least one of the lights disposed within the front cavity, and at least one of the lights disposed within the back cavity. The lighting device may additionally include a coupling device, such as a female threaded component, configured to interface directly with an attachment mechanism atop a traffic cone. The coupling device may be disposed on the bottom face of the body.

A lighting device may include a body including a front cavity and a back cavity, and a bottom face between the front cavity and the back cavity. The lighting device may also include multiple lights, with at least one of the lights disposed within the front cavity, and at least one of the lights disposed within the back cavity. The lighting device may additionally include a coupling device, such as a female threaded component, configured to interface directly with an attachment mechanism atop a traffic cone. The coupling device may be disposed on the bottom face of the body.

A method, apparatus for making, and a retroreflective traffic sign consists of a polymeric film having a front face and a rear face, wherein the rear face has a pattern of microprismatic retroreflective elements integrally formed as part of said film; a pattern of cell walls formed of an adhesive-containing polymer defining cells in which the microprismatic retroreflective elements are in the cells; and a substrate is adhered directly to the cell walls formed of the adhesive-containing polymer while leaving an air gap between the microprismatic retroreflective elements and the substrate in the cells.

A method, apparatus for making, and a retroreflective traffic sign consists of a polymeric film having a front face and a rear face, wherein the rear face has a pattern of microprismatic retroreflective elements integrally formed as part of said film; a pattern of cell walls formed of an adhesive-containing polymer defining cells in which the microprismatic retroreflective elements are in the cells; and a substrate is adhered directly to the cell walls formed of the adhesive-containing polymer while leaving an air gap between the microprismatic retroreflective elements and the substrate in the cells.