I was always told when learning to drive that you shouldn’t use cruise control when it’s raining. I never have but why can’t we?
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For modern cars it’s no longer a stability issue, rather it’s sensor issues.
Modern cruise controls are pretty much all ACCs, distance measuring sensors detect traffic and car lane markings in front of you to decide optimal speed and traffic following.
Those sensors, especially long-distance ones used for ACC, work terribly in the rains, either you end up really close to the car in front of you before getting any signals back, or it gets false positive readings all the time and you can’t follow the traffic properly.
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