Among all the safety systems found in today’s vehicles, there is one that stays remarkably discreet, yet occasionally steps in to let us know our attention level isn’t quite where it should be. Often, we wonder why the system is intervening when we feel completely in control. Sometimes, it genuinely detects fatigue or inattention. Either way, in 2021, the U.S. Congress asked regulators, through the Infrastructure Investment and Jobs Act, to establish, within a few years, standards requiring technologies capable of detecting driver inattention or impairment.
The technology has been around for roughly 20 years.
Not all systems perform equally well.
The hope is that one day they’ll be able to reliably detect an impaired driver.
Are automakers ready? They seem divided on the question. Several experts believe the technology isn’t fully mature yet, particularly in detecting impaired drivers. Time will tell, but all of this got us thinking. So, let’s take a step back to understand how these systems that assess our fitness to drive came to be and how they actually work.
Humble Beginnings
One of the first modern systems appeared in 2006, when Toyota integrated a driver monitoring device for the first time into certain Lexus models sold in Japan, including the GS sedan. The concept was straightforward: detect signs of drowsiness before an accident could occur.
The technology has evolved rapidly. Today, dozens of vehicles are equipped with it. In some cases, it monitors attention as part of a semi-autonomous driving system, as seen with Cadillac’s Super Cruise, Ford’s BlueCruise, and various Mercedes-Benz, Subaru, and Tesla vehicles. The European Union, for its part, now mandates drowsiness (and inattention) detection systems for new vehicles.
How It Works
A driver monitoring system, commonly referred to as DMS, uses an infrared camera aimed at the driver’s face. This camera can often “see” even at night or when the driver is wearing sunglasses. It continuously analyzes eye movements, head position, blink rate, and gaze direction. Software then processes these behavioral parameters in real time to detect signs of inattention or fatigue, such as eyes closing, head drooping, and gaze drifting toward a smartphone screen.
If the system perceives a risk, it first issues an audible or haptic alert. In more advanced versions, it can trigger repeated warnings, reduce certain assistance features, or even initiate a safe stop.
Strengths and Limitations
The value of a DMS for fatigued drivers is undeniable. A moment of drowsiness on the highway can be fatal, and a timely warning can save lives. Modern systems can also, in some cases, detect phone use while driving, a genuine road safety benefit.
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Where things get complicated is with false detections. Some systems misread a situation and flag a driver simply for glancing at the rearview mirror a moment too long. If that translates to a beep, the only consequence is mild irritation for the driver. But if it results in reduced speed or interference with driving inputs, it becomes a real problem.
And then there are privacy concerns. Many are asking who stores this biometric data. Who has access to it? Insurance companies, eventually? What unintended consequences might await us down the road?
Eyes Everywhere
Some admit something is unsettling about being monitored by their own vehicle. It’s a matter of perspective. For the exhausted driver heading home after a long shift, the DMS is a welcome safety net. For someone on a long road trip who starts to feel fatigue creeping in after a few hours behind the wheel, that same monitoring could save their life, or someone else’s.
There’s genuine value here, as there is with most technology.
That said, if we need technology to stop people from looking at their phones while driving, that points to a deeper problem, one that goes well beyond simple distraction. Relying on a system to override a driver who cannot resist their screen is a troubling thought.
And does this kind of technology encourage a certain disengagement among some drivers? It’s a question worth asking.
Final Word
Driver attention monitoring is here to stay. One can only hope it becomes effective enough to save more and more lives. As for the rest of us, the goal should be simple: drive in a way that means the technology never needs to intervene in our daily routine, except in cases of genuine emergency.
