While the "brake" issues are valid, if you have adaptive cruise control there may be other issues. Adaptive cruise control will automatically slow your car down to match the speed of a slower moving vehicle in front of you. Some of them work by transmitting a microwave (radar if you will) signal to measure the closure rate of the vehicle in front of you. Some use a laser system to do the same thing. The laser systems are adversely effected by rain and snow in that they tend to be blocked or confused by percipitation. Using a laser based adaptive cruise control in medium to heavy rain or in snow could cause the system to slow down prematurely making turning it off the better option.
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