In Jokkmokk, a tiny hamlet just north of the Arctic Circle in Sweden, where temperatures can dip to 50 below, Volvo Cars self-driving XC90 sport-utility vehicle met its match: frozen flakes that caked on radar sensors essential to reading the road. Suddenly, the SUV was blind.“Its really difficult, especially when you have the snow smoke from the car in front,” said Marcus Rothoff, director of Volvos autonomous-driving program. “A bit of ice, you can manage. But when it starts building up, you just lose functionality.”
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