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
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