I love this guide, I just wish more people bothered to use this type of communication with lights.
Lights seem to have become just another way for people to distract one another. I'll never understand why people attempt to justify driving recklessly by having 20 beacons and hazards flashing.
We approach desensitization when this happens. If everyone drives with all of their warning lights enabled, I start to disassociate them with danger or a need to pay more attention.
TL;DR Proper usage of lights is important, if we don't do so, they become useless.