This is one of those things that takes next to zero effort to do right, but that almost everyone does wrong.
You hopefully already know that the “blind spot” is the name for the area on either side of a car that is invisible to wing mirrors. It’s such a frequent cause of accidents that higher-end car models have adopted fancy radar or camera systems capable of detecting other vehicles in your blind spots and delivering the information to you in furiously urgent beep-screams as you swerve in terror and/or crash anyway.
However, the technology isn’t the problem – the necessary equipment to eliminate blind spots was around back when Henry Ford was still producing cars. All you need are your car’s wing mirrors – which most people have adjusted incorrectly.
You see, blind spots can be put into full view of your side mirrors, provided that these mirrors are adjusted to contain no part of your own car. Just angle them away from you until the point where your car is no longer visible in either one, and leave them there. That way, there’s no overlap between them and the rearview mirror, and any car that’s passing you on either side will remain in at least one of your mirrors until it enters your field of vision.
Admittedly, this seems less like a “tip” and more like “the most obvious piece of instruction of all time,” but nobody freaking does it. Manufacturers have to let you adjust the mirrors (due to things like differences in driver height), and most people simply don’t know how to do it. That’s why those same engineers are spending millions on technology meant to eliminate blind spots — they have simply failed to teach people not to point their goddamned mirrors at the sides of the vehicle they’re attached to.