In 1983, the Department of Transportation required all auto and small truck manufacturers to install Center High Mounted Stop Lamps (CHMSLs) in order to reduce rear-end accidents. Research showed that such center stop lamps reduced accidents by 4.3%, saving Americans hundreds of milions of dollars in car damages, much less time and trouble.
When I commuted 25 miles each way from LA to Orange County, I would write on my yellow legal pad "BRAKE LIGHT OUT", honk and show it to the driver. For thirty years. I got tired of writing it down and printed it out. During that thirty years, I estimate I have notified 50,000 to 80,000 drivers of burned out brake lights by showing them this sign, which almost always gets a "thumbs up."
On July 12, I filed a formal whistleblower complaint with the Department of Transportation, providing considerable photographic evidence of virtually all car manufacturers violating Standard 108 by obscuring the mandated CHMSL with heavily tinted rear windows. I have also contacted a major law firm to file class action litigation against every American car manufacturer for product defects endangering the public in every state, even those who do not have the heavy tinted windows, but may be following such a car and cannot see the obscured CHMSL.
Do what you can for as many as you can, every day.