| 摘要 |
A method and apparatus for continuously or at a rapid rate of repetition measuring friction between a road surface and a tire, especially suitable for evaluating the severity of visually undetectable road ice at traffic speeds, consists of a separate test wheel attached to a vehicle and in contact with a road surface, wherein a controlled slippage of test wheel is created by a compressed spring acting either clockwise or counterclockwise to a hinge with a substantially vertical axis upon which the test wheel arm pivots. Electrical signals are produced varying in accordance with the angle of yaw, the signals being transmitted to an onboard computer or remote receiver. A suspension system links the test wheel to the vehicle.
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