[gojomo]

At least some of the benefit being an expiring 'novelty effect' seems plausible.

https://en.wikipedia.org/wiki/Novelty_effect

Maybe randomization of vehicle lighting schemes, across vehicles and time-periods, would provide the most-enduring improvements.

[lallysingh]

https://lightmodehelmets.com/ sticks to the outside of the helmet. Quite visible, but you feel as uncool as a highlighter yellow rain suit.

[gojomo]

Uncool?!? That's frickin' awesome! And you can leave it on from the parking lot to your DJ set. :)