Isn't it rather obvious that relying on a motor vehicle's rubber tires alone to stop movement on ice is like expecting a watercraft to remain in the same place on a body of water? A boat requires an anchor a toothed object which engages with stable earth and tethers the boat to hold it in place!
So likewise, motor vehicle's should have the option of a metal device with cleats which can be brought into firm contact with the pavement in cases of a total loss of braking or traction of all tires. Device could be connected to a hydraulic jack or let drop with an emergency signal from driver.
Surely an "ice brake" could save millions in insurance claims as well as reducing durations of traffic jams in dangerous weather conditions.
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