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It's not just about France. Fuck te law.
It's more about not being run over. Hi viz does make a big difference to being seen in dark or low light. So I want to wear it from now really. Ninja is 2014!
skinny-
It's a shame that Proviz doesn't have quite a race fit;
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High viz/fluro utilises an additional optical brightener dyestuff. This works by reflecting back ultraviolet light (invisible to the human eye) in the visible light spectrum, and 'amplifying' the base colour. It's used in lots of other things, to boost the brightness of white paper, and clothing detergents - this is how you can get 'whites whiter than white'.
After dark, there's very little ultraviolet light or artificial street/vehicle light, so the benefits for high-viz are during daylight hours, especially dawn and dusk, and in poor visibility weather.
...before this descends into chaos, I'm not saying it's a useless safety measure - it absolutely is - just an interesting point, and highlighting the need to utilise alongside retroreflective materials/good lights, and not be depended upon.
Another interesting effect is the Purkinje effect in which red looses vividness first (from brights) in low light.
edscoble
Chopsicle
disposable gilet that you can throw away after leaving France?