Ponder the red-backed poison frog. In nature, red can issue a warning to predators — stay away, the aposematic message reads. On the road, red can be a warning of its own, often flashing on emergency ...

American motorcycle manufacture Harley-Davdson has just announced the release of new flashing LED police mirrors, offering customers the possibility to choose between any combination of red and blue ...

SINGAPORE — The Land Transport Authority (LTA) on Tuesday (May 9) tested new features at two pedestrian crossings in the city, as part of a six-month trial to improve safety, in particular, to get ...

A pair of alternating flashing LEDs makes an excellent visual alarm. One of the LEDs remains illuminated, so there's little chance the alarm will go undetected, even by a casual glance. Several ...

A flashing LED is an excellent visual alarm. Unfortunately, the LED is a dc device and requires additional circuitry to operate from an ac source. Several circuits can perform the necessary function, ...