Cars don't act like air or water. They act like cars. With drivers. All the cars are different. All the drives are different. Unless there is an accident, none of the cars touches each other, unlike water or air molecules. Molecules don't do stupid things like change lanes at random or get drunk and drive upstream with the headlights off, either. (Or do they?!?!)
What you're dealing with is the perception of the drivers. Some drivers sense that others are "way too close" or going "way too fast". Other drivers might be in a car with a larger performance envelope and have better driving skills. (Think: 'The Stig' in a new Porsche on sticky tires.)
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