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| The main beam paradox: the light that helps you see better is blinding the driver coming the other way |
In Part 1, we covered the rules of car UX: glance time, the five principles, and a simple process for designing anything a person uses while moving. This time we get our hands dirty with the parts drivers actually touch and hear every day: the dashboard, the sounds, and the headlights.
There's one idea running underneath all three, so keep it in mind as you read. Good car design isn't just about the person holding the wheel. It's about everyone in the system: the driver, the passenger, the pedestrian, and the car coming the other way. A lot of bad car UX comes from designing for one of them and forgetting the rest.
Dashboard design: how the cluster earns every pixel
The dashboard, or instrument cluster, is the most important screen in the car and the one with the least room to be clever. Everything on it is competing for the same tiny slices of attention we talked about in Part 1. So the real skill isn't adding information. It's deciding what earns a place.
What actually belongs on a car dashboard?
Only what a driver needs while the car is moving. That's the whole filter. Speed, fuel or charge, gear, and active warnings earn permanent space because a driver needs them at a glance. Almost everything else- trip stats, settings, media browsing- can move to a secondary screen or wait until the car is parked.
Here's a useful rule: a dashboard is a live feed, not a control panel. Its job is to report the car's state clearly, the same way a good chart reports data. If you've ever read about showing data without overwhelming people, the same thinking applies here. Group related readouts, give the most important number the most visual weight, and let the rest sit quietly until it matters.
Making the one warning that matters stand out
Cars have a warning for almost everything, which is exactly the problem. When ten lights can glow at once, the truly urgent one gets lost in the crowd. This is where making the one thing that matters stand out becomes a safety feature, not just a design nicety.
In practice, that means a hierarchy of alarms. A low washer-fluid reminder can be a soft amber icon you notice later. A brake failure needs to be red, bright, and impossible to ignore. When every warning looks equally loud, drivers learn to tune all of them out, which is the worst outcome a dashboard can produce.
Sound design: the UX you never look at
Sound is the most underrated tool in a car. It's the one channel that works while a driver's eyes stay on the road, which makes it perfect for exactly the moments a screen can't help. A good chime, a well-placed click, a warning tone- these guide a driver without asking for a single glance.
This is why sound is a channel, not an afterthought. The best car interactions spread themselves across sight, touch, and hearing so no single sense gets overloaded. Sound carries the load when the eyes are busy.
Why do electric cars make fake engine sounds?
Because silence turned out to be dangerous. Electric cars are nearly silent at low speed, which sounds lovely until you realise pedestrians rely on engine noise to know a car is coming. So regulators stepped in. Systems called AVAS, required by rules like UN R138 in Europe and FMVSS 141 in the US, force EVs to emit a sound below a certain speed so people crossing the road, walking behind a reversing car, or stepping off a curb can hear them.
Here's where it gets interesting. That forced sound is now a design surface. Carmakers get to decide what safety sounds like, and some treat it as a craft, hiring sound designers to build a tone that's noticeable to pedestrians but pleasant inside the cabin. A safety requirement became a piece of brand identity. That's car UX at its best: a constraint turned into something people actually enjoy.
Good chime, bad chime: the art of the alert
Not all sounds help. A bad chime is one that fires too often, sounds the same as five other chimes, or nags without telling you what's wrong. You already know the feeling: the seatbelt reminder that won't stop, the door-ajar tone that sounds exactly like the low-fuel tone. When sounds blur together, they stop meaning anything.
A good chime does the opposite. It's distinct, so you know what it means without looking. It's proportional, gentle for small things and urgent for real ones. And it stops once you've understood it. These are the same principles behind microinteractions, the smallest moments that shape how a product feels. A car is just a place where getting them wrong is louder, literally.
The main beam paradox
Now the strangest bit of car design, and the clearest example of that system idea from the top. Your main beam, or high beam, exists to help you see more of the road at night. Point it down an empty country lane and it's genuinely brilliant. It lights up far more than your normal headlights ever could.
Here's the paradox. The very thing that helps you see better makes the road more dangerous for everyone else. High beams are aimed higher and brighter, which means they land right at the eye level of oncoming drivers. What feels like a clear view from your seat is a wall of glare from theirs. You've improved your experience by wrecking someone else's.
This is the trap car designers, and honestly all designers, fall into constantly. You optimize hard for one user and forget the system they're part of. A brighter beam, a louder alert, a bigger notification: each one wins for the individual and loses for everyone around them. The best solutions design for the whole road, which is why modern cars now offer automatic high beams that dim themselves the moment they detect another car. The technology exists precisely because humans are bad at remembering to think about the other driver.
Why is it bad to drive with your high beams on?
Because in most situations it makes everyone less safe, including you. Three reasons worth knowing.
First, glare blinds oncoming drivers. Studies on opposing high-beam glare show it measurably degrades a driver's vision, and a temporarily blinded driver can drift or swerve, sometimes straight toward you. Your better view costs them their view entirely.
Second, high beams backfire in fog, rain, and snow. The bright light reflects off moisture in the air and bounces straight back at you, creating a white wall effect that makes it harder to see, not easier. In bad weather, low beams genuinely work better.
Third, it's usually against the law. Most places require you to dim your high beams within about 500 feet of an oncoming car and 200 to 300 feet when following someone. The rule exists for the exact reason above: your light is someone else's blindness.
The simple habit: use high beams only on dark, empty roads with no one ahead or coming toward you, and dim them the moment you see another car. It's a tiny act of designing for the system instead of just yourself.
Quick answers
Why do electric cars make artificial sounds?
Because they are nearly silent at low speed, which is dangerous for pedestrians who rely on engine noise. Rules like UN R138 and FMVSS 141 require EVs to emit a warning sound (AVAS) below a certain speed.
When should you use high beams?
Only on dark, open roads with no oncoming or leading traffic. Dim them within roughly 500 feet of an approaching car and 200 to 300 feet when following one, and avoid them in fog or heavy rain where they reflect back and reduce visibility.
What belongs on a car dashboard?
Only what a driver needs while moving: speed, fuel or charge, gear, and active warnings. Everything else can move to a secondary screen or wait until the car is parked.
That's the series
Across both parts, one idea keeps returning: car UX is regular design thinking with the volume turned up and the stakes made physical. Glance time, clear hierarchy, feedback you can feel, and a habit of designing for the whole system instead of one person. Get those right and you're not just making a car easier to use. You're making the road safer for everyone on it.
If you jumped in here, go back and read Part 1 on the principles and the process, or start from why car UX is so complicated to design and follow the breadcrumbs forward. And if you want to see the psychology behind the warnings and chimes up close, microinteractions and the Von Restorff effect are the two ideas doing most of the quiet work.
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