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AAA Oregon warns: Driver assist features lose performance in poor weather, pose safety risk

'As drivers, we cannot give up the task of driving'

BEND, Ore. (KTVZ) -- New research from AAA finds that rain diminishes the performance of advanced driver assistance systems, such as automatic emergency braking and lane-keeping assistance.

Vehicle safety systems, also known as advanced driver assistance systems, or ADAS, are typically evaluated in ideal operating conditions. However, AAA believes testing standards must incorporate real-world conditions that drivers normally encounter.

“We can’t just test these things on sunny, dry roads and think, 'Okay, they’re good to go,'" AAA Oregon/Idaho spokeswoman Marie Dodds said Wednesday.

AAA, in collaboration with the Automobile Club of Southern California’s Automotive Research Center, simulated rain and other environmental conditions (bugs and dirt) to measure impact on the performance of ADAS like automatic emergency braking and lane keeping assistance.

During closed-course testing, AAA simulated rainfall and found that test vehicles equipped with automatic emergency braking traveling at 35 mph collided with a stopped vehicle one-third of the time. Lane-keeping assistance didn’t fare any better, with test vehicles departing their lane 69% of the time.

“We have to really look into how these systems perform when it's raining, when it’s snowing," Dodds said. "What happens when there’s a bug in the sensor or dirt in the camera. How is that going to impact these systems?”

To simulate rainfall, AAA engineers designed a system using a reservoir to hold water, a high-pressure pump for a consistent flow of water and a precision injector nozzle to spray the windshield. This system was secured in the cargo area of the test vehicle and was connected to a nozzle positioned above the windshield so that the spray pattern covered the entire windshield. It should be noted that water sprayed by this system did not reach the pavement or interact with the test vehicle’s tires.

"Automatic emergency braking didn’t work, and the car slammed into the stalled vehicle that was in front of it,” Dodds said of the various tests conducted.

Although testing was done in rainy conditions, Dodds said the same results can be applied for areas that experience snowfall.

Many people rely on driver assist features, and Dodds said they can be useful, but strongly urges drivers to always pay attention. No matter how advanced you feel the features may be, adding these systems can’t replace an alert driver.

“As drivers, we cannot give up the task of driving," she said. "we can’t be complacent behind the wheel and do other things."

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Leslie Cano

Leslie Cano is a multimedia journalist for NewsChannel 21. Learn more about Leslie here.



  1. And when you question the promoters of these systems “what about weather” they tend to get defensive rather than address the concern, then it’s “well, there are others driving the systems out there”

  2. Now that the shortcomings of lane departure technology have been revealed, people may decide to not use it. People being able to choose to not use this technology is totally unacceptable as the experts who produce these systems have declared them to be “safe and effective”. AAA has obviously been taken in by misinformation spread by conspiracy theorists on Qanon and are also clearly Trump supporters. Lane departure technology saves lives and therefore mandates are now being explored to force people to use this technology or lose their driver’s license, their jobs, and their children will not be allowed in classrooms. This is a matter of public safety. Quit trying to keep your vehicle in your lane on your own abilities as this threatens the lives of everyone on the highway. Use lane departure technology at all times and stop listening to the misinformed opinions of people like those at AAA. Sarcasm can be fun and it can also point out truth in other things that are far more serious.

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