If you’ve ever done the shoulder-check-and-pray move before merging, you’re not alone. Most drivers set their side mirrors wrong from day one, which means they’re relying on a quick head turn to cover a gap their mirrors should’ve handled. There’s a simple blind spot trick that fixes this permanently, and almost nobody teaches it anymore.
TL;DR: Most drivers angle their side mirrors so they overlap with the rearview mirror’s view, creating a massive blind spot on both sides. Widening your side mirrors so they just barely lose sight of your own car’s rear quarter panel eliminates that gap almost entirely. It takes two minutes to set up and changes how confident you feel changing lanes.
Why Your Mirrors Are Probably Set Up Wrong
Here’s how most people adjust their mirrors: they sit in the driver’s seat, angle the side mirrors until they can see a sliver of their own car, and call it done. It feels intuitive because you can visually confirm your car is in frame. The problem is that this setup creates three overlapping fields of view — your rearview mirror, your left mirror, and your right mirror all show roughly the same area behind you.
That overlap sounds reassuring, but it actually creates two dead zones on either side of your vehicle, right where a car is most likely to be hiding when you go to change lanes. You end up needing that extra shoulder check because your mirrors simply aren’t covering that space.
The Trick: How to Eliminate Blind Spots for Good
This method sometimes gets called the BGE technique (blind spot elimination), and it’s been floating around driving schools and safety courses for years without ever really catching on with everyday drivers. Here’s how to set it up:
- Sit in your normal driving position, then adjust your rearview mirror like usual so it frames the full rear window.
- For your side mirrors, lean your head toward the driver’s window until it touches the glass, then adjust the left mirror so you can just barely see the back edge of your car.
- Do the same on the passenger side — lean toward the center console, then adjust the right mirror until your car’s edge just disappears from view.
- Sit back up in your normal position. Your side mirrors should now show almost none of your own car.
It feels wrong at first. Your brain wants that visual anchor of your own vehicle in the mirror. But that anchor is exactly what’s costing you coverage.
Why This Actually Works
When your mirrors are widened this way, the field of view from your side mirrors picks up right where your rearview mirror’s coverage ends, and your peripheral vision picks up right where the side mirrors end. Instead of three mirrors showing you the same 40-degree slice behind your car, you get a continuous sweep from directly behind you all the way to your peripheral vision on each side.
In practice, this means a car sitting in what used to be your blind spot now shows up clearly in your side mirror before it ever disappears from view. You still glance over your shoulder before a lane change — that habit should never go away — but you’re no longer relying on it to catch cars your mirrors should’ve shown you in the first place.
Test It Before You Trust It
Don’t just set your mirrors this way and head straight onto the highway. Spend a few minutes in a quiet lot getting used to the new field of view, the same way you’d want to practice any new driving habit before relying on it in traffic. If you haven’t already, the empty parking lot trick we covered for winter driving practice works just as well here — it’s a low-stakes way to build muscle memory for anything new behind the wheel.
Once you’re comfortable, pay attention to how a car in the next lane moves through your field of view during a normal drive. You’ll notice it transitions from your rearview mirror to your side mirror to your peripheral vision without ever fully vanishing. That’s the whole point.
A Good Habit to Pair With This
Mirror adjustment is a five-minute fix, but it works best alongside other small habits that add up to safer, more confident driving — things like consistent following distance, smart lane discipline, and knowing your merge points. If you’re looking to tighten up your daily commute even further, our breakdown of the merge lane technique pairs really well with better mirror awareness.
If you’re teaching a new driver in your household, this is one of those tricks that’s worth showing them early, before bad mirror habits set in. It’s also worth pairing with the basics — having the right documents and emergency essentials on hand matters just as much as good mirror setup. The New Driver Gift Set covers a lot of that groundwork in one go, so newer drivers aren’t scrambling to figure out what they need after the fact.
The Bottom Line
Blind spots aren’t some unavoidable fact of driving — they’re mostly a byproduct of how mirrors get set up. Widening your side mirrors so they lose sight of your own car feels unnatural for about a week, and then it becomes the only way you want to drive. It’s free, it takes minutes, and it closes a gap that causes a lot of avoidable close calls every day.
Drive smarter, not harder. Sometimes the biggest safety upgrade isn’t a new gadget — it’s just adjusting what you already have.
