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 ...

Roadside assistance and vehicle recovery operators are now able to apply for permission to use red flashing lamps on their vehicles. Red flashing lights were first mooted in the Department for ...

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 ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. RALEIGH, N.C. (WNCN) — The North Carolina ...

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 ...

This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one ‘flashing’ LED and a string of ‘normal’ LEDs. The flashing LED ...