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For some road ragers, it’s a need for control, to counter other drivers whom they feel violate their proxemic space, or it's a need for possession of their lane or their part of the road. For others, it’s unchecked anger and aggression. It’s hormone-based, primitive, small-brain thinking, bringing a lack of emotional intelligence and the need to dominate someone else and their unsharable space. Add in unchecked egos, the need for superiority, narcissistic pride, and male genital one-upmanship (my vehicle is bigger than yours).
https://www.psychologytoday.com/gb/blog/the-act-violence/201301/the-psychology-road-rage
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A catalyst of road rage is anonymity. Numerous studies show people exhibit more aggressive behavior when their identity is hidden. “You’re in a car, and it’s kind of a weapon, and you’re in a protected environment, and you think no one’s going to be able to get to you”
https://www.cheatsheet.com/health-fitness/the-crazy-psychology-behind-road-rage-and-how-to-beat-it.html/