Research Reveals Steering Wheel–Based Systems Are Inferior
As vehicles become increasingly automated, automakers realize some technology may give drivers the false sense that the vehicle can drive itself. To counter this, driver monitoring systems with either a camera or steering wheel detection are used to prevent the deadly consequences of a distracted driver.
New real-world testing by AAA found systems using a driver-facing camera are best at keeping motorists focused on the road. Unfortunately, the technology is not foolproof and a driver determined to cheat the system can defeat it.
“Vehicle technology has the potential to improve roadway safety, but no matter how good the system is today, it still requires a focused driver behind the wheel,” said Gene LaDoucer, regional public affairs director for AAA-The Auto Club Group. “An effective driver monitoring system is vital to prevent distraction and alert the driver should they take their focus off the road.”
Active driving assistance systems are widely available and often called semi-autonomous because they combine vehicle acceleration with braking and steering. Since its introduction, there have been numerous newsworthy instances of drivers misusing the systems by watching videos, working, sleeping, or even climbing into the backseat. This behavior can go undetected by the vehicle and, in some cases, result in deadly crashes.
To prevent such activities, vehicles with this technology monitor drivers using either a camera-based system, which watches their face, or a system that monitors steering wheel movements. AAA test drove four popular makes and models in real-world conditions on a California highway to evaluate these systems’ effectiveness.
Key research findings include the following:
- Camera-based systems alerted disengaged drivers 50 seconds sooner and were more persistent than those detecting steering wheel movement when the driver was looking down with head facing forward, hands off the wheel.
- Camera-based systems alerted disengaged drivers 51 seconds sooner compared to steering wheel movement when the driver was facing away from the road, looking at the center console, with hands off the wheel.
- On average, the percent of time test drivers were engaged was approximately five times greater for camera-based systems than for steering wheel systems.
- Steering wheel monitoring required only minimal input to prevent system alerts, allowing up to 5.65 continuous minutes of distraction (at 65 mph, equivalent to over 6 miles of disengaged driving). In comparison, camera-based systems allowed 2.25 minutes of distraction during the ten-minute long test drive.
- Even after issuing multiple warnings of inattentive driving, both systems failed to disable the semi-autonomous features and force the driver to take the wheel and pay attention.
“Regardless of brand names or marketing claims, vehicles available for purchase today are not capable of safely driving themselves,” said LaDoucer. “The technology is meant to assist the driver, not replace them. Effective driver monitoring systems are critical to keeping drivers focused on driving.”
Vehicles equipped with camera-based driver monitoring systems were significantly better at preventing each type of tested distraction scenario by issuing alerts faster and more persistently than a steering wheel system, no matter the external lighting conditions. On average, the percent of time test drivers were forced to focus on driving was five times greater when facing a camera than with steering wheel input.
Both driver monitoring types were prone to being intentionally fooled, although those using a camera were harder to trick. AAA test drivers attempted to stymie monitoring system alerts with periodic head or eye movement and manipulating the steering wheel. Each driver was given the discretion to develop their cheat strategy, and it should be noted that no external devices, tools, or aids were used.
AAA continues to urge automakers to adopt an industry standard naming convention , for vehicle technology to prevent drivers from misunderstanding the capabilities of catchy, marketing-driven branded names for popular systems.
AAA conducted naturalistic driving evaluations on a 24-mile loop on a limited-access toll road in Southern California. The testing used four popular makes and models paired with a leading safety spotter vehicle. All test drivers and spotters were AAA researchers. Each simulated driver distraction test ran ten minutes and used three methods:
- Hands off the steering wheel, head up facing the road but gazing down.
- Hands off the wheel, head and gaze aimed down to the right toward the center console.
- Active circumvention or attempting to “beat the system” through a variation of gaze/head placement and periodic steering wheel input.
AAA selected four vehicles for testing, choosing two of each driver monitoring design type, camera-equipped and input from the steering wheel. The vehicles were as follows:
- 2021 Cadillac Escalade with “Super Cruise™” using a driver-facing infrared camera
- 2021 Subaru Forester with “EyeSight®” and Driver Focus using a driver-facing infrared camera
- 2021 Hyundai Santa Fe with “Highway Driving Assist” (steering wheel)
- 2020 Tesla Model 3 with “Autopilot” (steering wheel)
The vehicles were procured directly from the manufacturer or specialty rental fleets. AAA chose the test route due to its consistent traffic volume moving at or near the posted speed limit of 65mph to make the testing as safe as possible. Please refer to the full report for methodology details, including specific testing equipment and the driving route.
Active driving assistance, which is classified as Level 2 driving automation on SAE International’s scale of Level 0 to Level 5 and includes lane-keeping assistance and adaptive cruise control, provides the highest level of automated vehicle technology available to the public today. It also means that constant driver supervision is required. Most drivers will only interact with vehicle automation through these systems, which according to previous AAA research, are far from 100-percent reliable.
AAA provides more than 62 million members with automotive, travel, insurance, and financial services through its federation of 32 motor clubs and nearly 1,000 branch offices across North America. Since 1902, the not-for-profit, fully tax-paying AAA has been a leader and advocate for safe mobility. Drivers can request roadside assistance, identify nearby gas prices, locate discounts, book a hotel or map a route via the AAA Mobile app. To join, visit AAA.com.
About AAA - The Auto Club Group
The Auto Club Group (ACG) is the second largest AAA club in North America with more than 14 million members across 14 U.S. states, the province of Quebec and two U.S. territories. ACG and its affiliates provide members with roadside assistance, insurance products, banking and financial services, travel offerings and more. ACG belongs to the national AAA federation with more than 62 million members in the United States and Canada. AAA’s mission is to protect and advance freedom of mobility and improve traffic safety. For more information, get the AAA Mobile app, visit AAA.com, and follow us on Facebook, Twitter and LinkedIn.