Important safety systems can’t work when they can’t ‘see’ the road due to snow and ice.
Spend some time identifying all the sensors that may be hidden in the grille area so that you’ll know where to focus your cleaning effort. Vehicles that have FCW, AEB, and/or adaptive cruise control most likely have their radar sensors located behind the translucent brand emblem or in the lower center of the front bumper.
Many cars use cameras and sensors behind the glass for crash avoidance systems or automatic wipers. It’s worthwhile to clear and defrost your windshield entirely and stop periodically during foul weather to completely clear your windshield of built-up ice and snow.