For one, so you don’t get too comfortable and take your foot off the pedals. You want to be able to react more quickly and brake or at least ease off the gas if you need to.
Secondly, the cruise control is designed to keep the car going regularly on dry roads. When the road is wet you risk hydroplaning, when the tires don’t have enough traction and you start sliding around. Cruise control isn’t necessarily designed to deal with that so it can cause you to loose control if you do go over a slick patch of road or hit a deep puddle especially with one side of the car.
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