Adaptive cruise control systems commonly required driver intervention when another car cut into the lane, occurring about once every 8.6 miles (24.4 minutes) with 90% requiring intervention. Inadequate lane centering occurred once every 11.3 miles (32.2 minutes) with 72% requiring intervention. Failures to resume after stops happened 71 times and always needed driver action; 57 deactivations and 43 insufficient slow-downs occurred, 70% of which required braking. Less-advanced, hands-on systems experienced notable events three times more often than hands-off systems. Hands-off systems required intervention every 7.2 miles versus 2.3 miles for less-advanced systems. Recommendations include attentive driving, avoiding distractions, reading the manual, and increasing following distances.
As most people who have used adaptive cruise control in traffic can no doubt appreciate, the most common event that required intervention was a car ahead cutting into the driver's lane. These occurred about once every 8.6 miles, or 24.4 minutes, with 90 percent requiring intervention by the driver. Inadequate lane centering was the next most common event, occurring once every 11.3 miles or 32.2 minutes. Seventy-two percent of those events also required intervention.
Not resuming after coming to a halt happened 71 times, each of which required the driver to act. On 57 occasions, the lane keeping or adaptive cruise control deactivated, and there were 43 instances of a test car failing to adequately slow down, of which 70 percent required the driver to hit the brakes.
AAA found that the less-advanced systems that required a driver to keep their hands on the steering wheel experienced notable events at three times the frequency of hands-free systems. Hands-off systems only required intervention every 7.2 miles or 20.1 minutes, whereas the less advanced systems required intervention on average every 2.3 miles or 6.7 minutes. AAA also noted that the hands-off systems told the driver to put their hands back on the wheel every 5.5 miles (or 15.3 minutes) on average.
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