The Virtual Fencing device is activated by approaching headlights, which causes it to emit a combination of sound and flashing light stimuli that alert animals and in turn reduces the startling effect. This alert system of audible alert and blue and yellow strobe-type LED lights are an innovative concept based on proven technologies.

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The devices are placed at 25-metre intervals on alternating sides of the road. They are triggered in sequence by the vehicle headlight as a car approaches along the road, forming a virtual fence.