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一看到 "when your tyres lose contact with the pavement, your car will accelerate to a higher rate of speed" 就覺得 this is so full of xxit
車速與定速是透過偵測傳動軸的速率換算來的, 浮水效應 (hydro plane) 的時候你只會看到車速瞬間提高很多 (時速表上升, 但實際車速會因為無法加速而下降), 此時定速是呈現無加油狀態, 怎麼可能會替車子加速?
又如果是衝過 puddle 後, 車子要加速回當初定速的速率也是慢慢的 roll-on acceleration, 不會是全油門的急加速...
以下是其他讀者的回應:
This is the key that makes a nonsense of the email. Modern cars take their speedo reading from the driveshaft or transmission. This means the cruise control bases its responses on the speed of the driven wheels, not the car itself. This is an important distinction and fail safe position.
If the driven wheels skid because they lose grip, the spinning wheels will cause the speedo to show a higher reading which will force the cruise control to release the throttle faster than most drivers. Regardless of whether the car itself slows down or speeds up, the cruise control will always reduce the throttle no matter what until the driven wheels slow down back to the pre-set speed.
If the wheels continue to slip under this scenario, this will always leave the car travelling more slowly relative to the road, not faster as described in the email.
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