Abstract: A connection system to facilitate the mechanical coupling, and the transfer of electrical power between, trunk sections of an artificial tree is disclosed. The connection system can include a mechanical coupling system having a guiding surface and a guiding slot on a first trunk section and a guiding protrusion disposed inside a second trunk section. Insertion of the first trunk section into the second trunk section and thus contact of the guiding protrusion against the guiding surface can cause the first trunk section to rotate relative the second trunk section until a predetermined rotational alignment is reached, aligning electrical contacts of first and second electrical connectors, each of which is attached to an outer wall of a respective trunk section. The electrical contacts of the first and second electrical connectors can establish electrical communication between the first and second electrical connectors, and thus between the first and second trunk sections.

Abstract: The deployable hazard sign from a moving vehicle comprises a means for attaching the hazard sign to the rear area of a police vehicle, for example; a means of releasing the hazard sign which also allows easy recovery; a means for powering the hazard sign once released; a means for communicating to the hazard sign the proper warning information before the release thereof; a means attached to the hazard sign to indicate that an approaching vehicle has impacted the hazard sign, and further means of allowing the elevating of the warning lights before or after release. As the police vehicle approaches the breakdown or accident, the deployable hazard sign would be released from the police vehicle, appproximately 200 to 500 feet, behind the breakdown or accident. The policeman inside would determine the proper sign mode before release. The police vehicle would not have to stop to release the sign. After the situation has cleared, the police vehicle could backup to the sign to retrieve it.