I think all cars and trucks should be hi-viz, then that will reduce accidents, right? Why all vehicles dull earth tones? SO dangerous!!!
Cars already have increased conspicuity via DRLs and they do reduce accidents. Bikes also have DRLs for the same reason though reduced size and spread means they're only fractionally effective. Given the seriousness of a motorcycle/car collision, why reduce your conspicuity by running in stealth-mode gear?