The Whelen LIN3 is a 3-LED emergency service light module. It's one of many models and brands on the market aimed at professional emergency service vehicles. Federal is another major brand. As such that have a lot of different selectable patterns and colors and uses as provided by law.Martin Schneuer said:What is "Whelen LIN3"?
Many of us have co-opted one of the brand/versions to use as an auxilary brakelight. As state laws very regarding their use on private vehicles those of us who use one pays our money and takes our chances (because of the flashing of the light). An individual can buy them from most any reseller. It's how they're used that may be questioned.
I think most of us have never been stopped but there's always a first time. Having one switched at a handlebar pod is prudent.