II. - Le ou les feux arrière de brouillard ne peuvent être utilisés qu'en cas de brouillard ou de chute de neige. ☞ https://www.legifrance.gouv.fr/codes/article_lc/LEGIARTI000006842263

Feux de brouillard arrière : ils sont indiqués uniquement en cas de brouillard ou de chute de neige (mais jamais sous la pluie en raison de leur trop grande intensité) ☞ https://public.codesrousseau.fr/conseils-pratiques/909-feux-de-brouillard-avant-et-arriere-quand-les-utiliser.html

Seems much more complicated than having the brake lights rapidly flash during hard braking. But of course we couldn't do that in the US because our turn signals/hazard lights are red

Turn signals can be either red or amber in the US.

Not selling tanks as cars could also help. Especially with fatality rates

90% of the things that Japan introduced according to comment sections on the internet never happened (or never made it past the prototype stage) and the rest was actually introduced in Korea, not in Japan.

The Japanophilia is strong with a lot of people on the internet.

Since we're all throwing random ideas out here, I want to equip my vehicle with an annoyingly loud external speaker so that when someone near me does something dumb, I can personally shame them.

If a car is braking it rides differently from one that isn't. A car is normally rather level and leans "forward" when braking.

Besides that, YOU SHOULDNT GET IN FRONT OF ANYTHING YOU ARENT SURE IS STOPPING. If it's moving fast enough that you need this, you shouldn't be trying to get in front anyways.

Say you're a pedestrian and a car is coming toward you as you're entering a crosswalk. Being able to see if they are braking or not could save your life.

Since we're all throwing random ideas out here, I want to equip my vehicle with an annoyingly loud external speaker so that when someone near me does something dumb, I can personally shame them.

People don't even need car tbh. Motorbikes everywhere please. Zip zip, less traffic, everyone pays attention to road or falls and dies.

I get what you're saying — so it's about the subconscious awareness of the state change that happens after the driver decided to go, but before the car starts moving. I can see some amount of value in that.

I still can't help but think it's going to be interpreted by many as a sign that it's safe to proceed and ignore the car rather than be prepared for any eventuality, though.

Good luck transporting a couch on a motorbike.

People don't even need car tbh. Motorbikes everywhere please. Zip zip, less traffic, everyone pays attention to road or falls and dies.

I want to equip my vehicle with an annoyingly loud external speaker so that when someone near me does something dumb, I can personally shame them.

CB radios often had a "PA" switch that sent your microphone audio to a loudspeaker under the hood.

I'd prefer a "FlameThrower" button next to the horn.

Does your state not require good lights on the trailers? I just built a new trailer last year, I was required to have full working brake and turn signals along with running lights, but I went the extra step and included more brake/turn lights on the front and rear of the fenders, along with reverse lights plus four marker lights along each side. Trailers are hard enough to see, I didn't want to make it harder for anyone by just sticking with the bare minimum.

Reminded me of this Technology Connections video, in which the dude explained (among other brake-light related things) how some law allows electric vehicles to get away with not using their brake lights:
https://www.youtube.com/watch?v=U0YW7x9U5TQ

People don't even need car tbh. Motorbikes everywhere please. Zip zip, less traffic, everyone pays attention to road or falls and dies.

Since we're all throwing random ideas out here, I want to equip my vehicle with an annoyingly loud external speaker so that when someone near me does something dumb, I can personally shame them.

Rent a truck for cheap