A positionable warning sign device provides a portable unit which facilitates identification of a traffic hazard. The device includes a primary member, a first arm, and a second arm. The first and second arms are coupled to the primary member and pivotally positionable to form an end of an arrow. Light emitters are coupled to respective front walls of the primary member, the first arm and the second arm. Arcuate projections extend from the primary member defining a receiver. A projection extends upwardly from a top end of a tripod. An upper portion of the projection is insertable into the receiver whereby the primary member is coupled to the tripod and supported on the lip. A power supply is operationally coupled to the plurality of light emitters.

A positionable warning sign device provides a portable unit which facilitates identification of a traffic hazard. The device includes a primary member, a first arm, and a second arm. The first and second arms are coupled to the primary member and pivotally positionable to form an end of an arrow. Light emitters are coupled to respective front walls of the primary member, the first arm and the second arm. Arcuate projections extend from the primary member defining a receiver. A projection extends upwardly from a top end of a tripod. An upper portion of the projection is insertable into the receiver whereby the primary member is coupled to the tripod and supported on the lip. A power supply is operationally coupled to the plurality of light emitters.

A hazard alert system includes a vehicle that has a back side. A sign is removably coupled to said vehicle when the vehicle is parked on the side of a roadway. Thus, the sign may alert oncoming traffic to the vehicle. The sign includes an arrow. The sign is oriented in a selected manner such that the arrow points toward a selected side of the vehicle.

An emergency, camping, flood, home, work and law enforcement light has a large LED floodlight mounted by a two-dimensional hinge to a large battery/vehicular battery case, so when the case is on the ground, the light may be directed at any angle in both bearing and azimuth. The case further may have a light strip composed of numerous small LEDs capable of various modes of blinking operation in various colors, so as to mimic, in the dark, the appearance of emergency vehicles, for example with blinking orange lights, blinking red and blue lights and so on. The vehicle battery may provide power to a 12V/30V outlet of the case, or may be charged by the same socket.

Disclosed herein is a foldable emergency road sign which includes a bar-shaped handle, a hollow shaft connected to the bar-shaped handle, a spring pipe, the spring pipe having a hole through which the hollow shaft is inserted, a plurality of bodies connected to the spring pipe, wherein the plurality of bodies can be folded or unfolded to have a triangular pyramid shape or a quadrangular pyramid shape, and a light emitting unit attached at regular intervals to one side of the plurality of bodies.

Disclosed herein is a foldable emergency road sign which includes a bar-shaped handle, a hollow shaft connected to the bar-shaped handle, a spring pipe, the spring pipe having a hole through which the hollow shaft is inserted, a plurality of bodies connected to the spring pipe, wherein the plurality of bodies can be folded or unfolded to have a triangular pyramid shape or a quadrangular pyramid shape, and a light emitting unit attached at regular intervals to one side of the plurality of bodies.

A hazard triangle includes a triangular shaped body formed of a transparent or semi-transparent material having a thickness and three sides, one of which is a proximal edge. The thickness is substantially less than a length of any of the three sides. An illumination element is configured to emit light into the proximal edge. The emitted light is propagated by the body such that light is emitted from surfaces of the body other than the proximal edge.

A hazard triangle includes a triangular shaped body formed of a transparent or semi-transparent material having a thickness and three sides, one of which is a proximal edge. The thickness is substantially less than a length of any of the three sides. An illumination element is configured to emit light into the proximal edge. The emitted light is propagated by the body such that light is emitted from surfaces of the body other than the proximal edge.

Systems and methods are disclosed for reliable detection of oncoming trains and for warning roadway personnel working on the railroad track of the oncoming train. A train detection system includes a wireless communication network further including train detection modules attached to catenary poles along the sides of the railroad track. Each train detection module is equipped with at least two diverse sensors configured to detect trains and other on-track vehicles. Each train detection sensor is simultaneously active and works with other train detection sensors to detect an approaching train and generate train alerts. The train alerts are transmitted wirelessly over the wireless communication network by the train detection modules. The system transmits train alerts to personal alert devices worn by roadway workers. The personal alert device forms an ad-hoc wireless network with the train detection modules.

A warning triangle structure includes a base, a triangle, a number of connecting rods, and a braking device. The triangle includes a bottom end and a top end opposite the bottom end. The bottom end is fixedly mounted to the base. Each of the connecting rods includes a first end and a second end. The first end is fixedly coupled to the base, and the second end is mounted with a rotatable support wheel. The braking device is installed at the second end of at least one of the connecting rods. The braking device includes a transmission shaft coupled to the support wheel. The braking device controls the support wheel to stop rotating by stopping the transmission shaft from rotating.