An in-depth look at the sensor architecture behind adaptive cruise control.
Explore how millimeter-wave radars, windshield cameras, GPS map data, and machine learning models combine to measure traffic gaps, handle stop-and-go queues, and mimic driving styles.
How does the car see the road?
The technology is based on two main components. The first is a radar that is hidden low on the front of the car, usually behind the badge or grille. It sends radio waves to the vehicle in front and measures the time it takes for them to return, thus calculating the distance and speed, even at night or in fog. Drivers can easily interfere with the radar by putting on stickers, license plate frames or by slightly crashing while parking.
The second component is a camera mounted high on the windshield, behind the mirror. This camera tracks the road lines so the car can recognize which vehicle is ahead of it, and it also helps detect cars that suddenly swerve in front of you. Some automakers also combine these components with GPS data.
What these systems can't do
Despite software improvements, such as systems that adjust speed before cornering or those that learn from the way you drive, the technology has significant limitations. Manufacturers warn that these systems should not be used in rain, fog, snow, on slippery roads, in heavy traffic, on sharp turns, or on uphill and downhill slopes.
Heavy rain can significantly reduce the radar's ability to detect vehicles. In addition, according to manufacturers' warnings, these systems do not function as a collision avoidance system. They do not stop for pedestrians, animals, small vehicles such as bicycles, or for vehicles coming from the opposite direction or already stopped.
The danger of driver complacency
Research has shown that drivers tend to relax too much when using assistive devices. In a month-long trial with volunteers, those who had a lane-keeping system were found to be more than three times more likely to be looking at their phone or car screen and driving with their hands off the wheel seventeen times more often by the end of the period. Meanwhile, an earlier study found that drivers with active speed systems were 24% more likely to speed on the highway and were driving at even higher speeds.
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