#rain

A new study from the American Automobile Association (AAA) has found that rain can severely impair advanced driver-assistance systems (ADAS). Similar to how highway traffic slows to a crawl when there’s a sudden deluge, modern safety equipment can have real trouble performing when a drizzle becomes a downpour.

On Thursday, the motor club organization released findings from closed-course testing that appeared to indicate some assistance suites had real trouble seeing through bad weather. AAA reported that 33 percent of test vehicles equipped with automatic emergency braking traveling collided with a stopped car when exposed to simulated rainfall at 35 mph. The numbers for automatic lane-keeping was worse, with 69 percent drifting outside the lines. Considering the number of times the people writing for this website have anecdotally criticized ADAS for misbehaving in snow, sleet, rain, fog, or just from an automobile being a little too dirty, it’s hard not to feel a little vindicated.

Through Sunday morning, Harvey continued to unleash record levels of rain upon Texas, causing biblical flooding. The situation is so bad that the National Weather Service warned of “additional catastrophic, unprecedented and life threatening flooding” into the next week, and placed flash-flood emergencies for the entirety of Southeast Texas.

Harvey was the strongest storm to hit the United States since 2004 and has already trapped countless individuals, both in their homes and on the road as the rain has turned several major highways into man-made rivers. In some areas, the waterline is high enough to reach streetlights.

TTAC commentator kericf writes:

Sajeev,

I know you experienced the deluge of rain in Houston (Last October, and it was pretty bad. —SM). We live on the north side of the city and own a six-month-old 2015 Ford Expedition EL that has been outside its whole life (it doesn’t fit in the garage). It has seen much heavier rain than we had this weekend, but not a storm that lasted so long.

Water somehow got into the headliner and dropped into the interior. It does have a sunroof and roof rack. The dealership has only had it a day but hasn’t been able to figure out the source of the leak. It hasn’t leaked before. We are baffled and I have a feeling the dealership will be too.