Originally Posted by RCMoeur

As someone who has operated bicycles with rather bright lights for 40+ years*, and motor vehicles with full SAE warning light systems for nearly that long, all I can say is that increasing conspicuity can help - but only if the approaching road user is focused on the driving/riding task. Unfortunately, it seems the trend hasn't been positive in this regard in recent years. My observation when Arizona passed their driver handheld cell ban was that drivers just moved the phone below window level when continuing to use it. Now they just hold it in plain sight in the expectation of minimal to nonexistent traffic enforcement. :\

*I still have a Belt Beacon, but 9 volt batteries aren't cheap...