You are also blending sounds from other cars, as well as sounds from your tires on the road which gives you some feedback on the driving conditions. All of those match patterns that you have seen before and give you a better feeling about your car status.

The brain is using hundreds of different captors and is order of magnitude more powerful than any computer today. Attempting to drive with a couple cameras as only sensors is a recipe for disaster as has already been proved (see also: Tesla crashes)