One issue is:
- Propensity of people to use "lasers" for this, see above link.
- Bikes with and without motors, lean to the side.
- People don't like lasers being flashed in their eyes.
But even motorbike foglights, turned almost vertically down at the road, would achieve something like this.
I just moved to the Netherlands where bikes are aplenty and saw one of these two nights ago. It was not so dramatic as the examples you linked but still very visible. I think this could be a good option for motorcycles.
Similar to https://www.aliexpress.com/w/wholesale-bicycle-laser-tail-li...
One issue is: - Propensity of people to use "lasers" for this, see above link. - Bikes with and without motors, lean to the side. - People don't like lasers being flashed in their eyes.
But even motorbike foglights, turned almost vertically down at the road, would achieve something like this.