Why YSK: Your signals alert other drivers as to what you’re doing; a signal bulb costs a few bucks and is usually a quick and easy repair to do yourself (consult YouTube); and any place that regulates motor vehicles probably requires you to have working turn signals. So knowing when and how to replace a burned out signal bulb can save you an interaction with law enforcement.
Adding: You can diagnose which bulb is out by turning on your hazard lights and checking all four corners of your car. It’ll be the one not flashing.
This is also probably a good time to check your brake lights. Put something heavy on the pedal or have a friend hold it down and check that all three brake lights illuminate. Replacing a burned out brake light is also usually pretty cheap, quick, and easy.
Honestly the best solution, as with most traffic annoyances, is just to quietly curse at them as you go about your day and let the police deal with enforcing the laws.
When trying to teach someone a lesson, you might get the occasional person who was absent-mindedly being annoying, but most people are just going to come away from the interaction thinking YOU are the asshole. Not to mention the person who is being an asshole on purpose looking for confrontation…
The best option would be for ongoing training for driving.
Police don’t enforce the laws. Police are quite happy to punish people for speeding, because it’s an easy charge to convict - it’s much harder to convict someone with the crime of sitting in the middle lane. So they don’t bother.
In my experience in the UK, most drivers actually respond to an interaction like I’ve described. When I flashed the indicator, then moved over to the inside lane, many drivers followed and moved into the inside lane. When I’ve looped around them, I’ve never been able to complete that many loops, because the other driver has realised what I’m doing and moved into the inside lane.
Communication =/= confrontation. When driving, we are very limited in our communication - but that doesn’t mean there is no way to communicate.