The Truth About Advanced Driver Assistance

Car manufacturers heavily promote advanced safety features, promising a relaxed and secure driving experience. However, the reality on the highway is often quite different. Systems designed to keep you safe, such as lane-keep assist, can sometimes create dangerous situations and even lead to accidents if you are not prepared for their quirks.

What Are Advanced Driver Assistance Systems?

Advanced Driver Assistance Systems (often abbreviated as ADAS) are electronic technologies designed to help the driver in the driving process. Almost every new car sold today comes with a proprietary version of this technology. You might recognize them by brand names like Toyota Safety Sense, Honda Sensing, Ford BlueCruise, or Tesla Autopilot.

These packages usually include a mix of automatic emergency braking, adaptive cruise control, and lane-keep assist. While adaptive cruise control manages your speed to keep a safe distance from the car ahead, lane-keep assist actively manipulates your steering wheel to keep your vehicle centered within the painted lines on the road. In theory, this prevents you from drifting into another lane if you become distracted. In practice, the technology is far from perfect.

How Lane-Keep Assist Can Cause Accidents

The core issue with lane-keep assist is that it relies almost entirely on outward-facing cameras. These cameras are essentially looking for high-contrast lines painted on the asphalt. When the road is perfectly paved and clearly marked, the system works well. When conditions are less than ideal, the system can actively fight the driver.

Misreading the Road

Road construction zones are a massive blind spot for driver assistance systems. In a construction zone, road crews often grind off old lane lines and paint temporary lines. To a human, the correct path is obvious. To a camera, the scarred pavement, old faded lines, and new painted lines look like a confusing web.

If your lane-keep assist locks onto an old, ground-out lane line that leads directly into a concrete barrier, the car will actively steer you toward that barrier. Drivers have reported having to forcefully wrestle the steering wheel away from the car to avoid a crash.

Fighting for Control and Overcorrection

Imagine you are driving down the highway and you spot a large piece of tire debris or a massive pothole in your lane. Your natural instinct is to swerve slightly to the left or right to avoid it.

If your lane-keep assist is active, the car will sense that you are leaving your lane without using a turn signal. The computer immediately applies steering torque to pull you back to the center of the lane. Now, you are fighting the car. You pull left, and the car pulls right. If you pull hard enough to override the system, the computer will suddenly disengage. Because you were applying heavy force to overcome the car’s resistance, the sudden release can cause you to jerk the steering wheel violently. This overcorrection can easily send your car spinning out of control or into adjacent traffic.

The Ping-Pong Effect

Many entry-level systems do not actively center the car. Instead, they wait until the tires touch the painted line before bouncing the car back into the lane. This creates a “ping-pong” effect. The car drifts left, hits the line, jerks right, drifts to the right line, and jerks left. This unpredictable swaying can confuse other drivers around you and greatly increase the chances of a sideswipe collision in heavy traffic.

The Danger of Phantom Braking

Steering issues are not the only problem. Adaptive cruise control and automatic emergency braking systems suffer from a terrifying phenomenon known as phantom braking.

This happens when the car’s radar or cameras falsely identify an obstacle that does not exist. A strong shadow from an overhead bridge, a shiny overhead road sign, or a semi-truck driving in the next lane can trick the vehicle’s computer. The car believes a crash is imminent and slams on the brakes at highway speeds. Dropping from 70 miles per hour to 40 miles per hour in a matter of seconds for absolutely no reason is a massive rear-end collision hazard. The National Highway Traffic Safety Administration (NHTSA) has launched multiple investigations into major automakers, including Tesla and Honda, due to thousands of customer complaints regarding phantom braking.

Automation Complacency

The most insidious danger of advanced driver assistance is psychological. When a car handles the steering, braking, and accelerating for long stretches of time, human beings naturally tune out. This is known as automation complacency.

Drivers begin to trust the system too much. They start looking at their phones, turning around to check on children in the back seat, or simply daydreaming. The problem is that these systems are considered “Level 2” automation. They are not self-driving cars. They require the human driver to remain fully attentive and ready to take over at a fraction of a second’s notice.

If a driver is completely tuned out and the lane-keep assist suddenly loses track of the lane on a sharp curve, the driver will not have enough time to process the situation, grab the wheel, and correct the steering before the car leaves the roadway.

What the Safety Studies Actually Say

Independent safety organizations are actively sounding the alarm about over-reliance on these features. A comprehensive study by the AAA Foundation for Traffic Safety tested several active driving assistance systems. They discovered that these systems experienced some type of issue or failure every 8 miles on average. That is a surprisingly high failure rate for technology heavily marketed as a safety net.

Furthermore, the Insurance Institute for Highway Safety (IIHS) recently tested 14 partial driving automation systems from major automakers to see if they adequately monitor the driver. The results were alarming. Only one system (Lexus Teammate) earned an acceptable rating. Eleven of the systems, including popular options from Ford, GM, and Tesla, received a “poor” rating because they lacked adequate safeguards to ensure the human driver was actually paying attention.

How to Protect Yourself

You do not need to abandon these features entirely, but you must change how you view them. Treat advanced driver assistance systems like a helpful co-pilot rather than a chauffeur. Keep your hands on the steering wheel and your eyes on the road. Most importantly, know when to turn the systems off. Disable lane-keep assist and adaptive cruise control when driving through construction zones, during heavy rain or snow, and on winding rural roads where lane lines are inconsistent.

Frequently Asked Questions

Can I permanently turn off lane-keep assist?

Yes. Almost all modern vehicles allow you to disable lane-keep assist. You can usually turn it off by pressing a dedicated button on the steering wheel or dashboard, or by navigating through the vehicle settings menu on your central infotainment screen.

Does car insurance cover accidents caused by driver assistance features?

Yes, your auto insurance will cover the accident, but you will still be held at fault. Under current laws, the human driver is always legally responsible for the safe operation of the vehicle. You cannot blame the car’s computer for a collision.

Are some brands better at driver assistance than others?

Yes. Organizations like Consumer Reports regularly test these systems. General Motors’ Super Cruise and Ford’s BlueCruise consistently rank very high for their performance and their strict driver monitoring cameras (which ensure you are looking at the road). Systems from Subaru and Hyundai also frequently receive high marks for their reliability in clear weather conditions.