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Brakes?
Thing is, hitting a car to jump the driver to attention is gonna make the car react quickly and without predictable thought.
The driver might also think he has actually hit you.
Defensive anxious road users tend to not be grateful nothing actually happened but extremely angry they got a wee scare.
Like when peds step out.
It's not "glad I didn't hit them" it's "you funking cunt look where you're fucking going" which is dumb af really.Again, nothing excuses his behaviour during or after. Just about picking the right battles really :)
Sounds a total dick.
Don't touch/hit/caress/spit traffic though.
What's the end plan?