Best to breathe and let it go.
So now I just kinda think, would it be worth getting stabbed over?
Exactly, every time I get angry with another driver's stupidity I end up stewing over it for ages...it's just not worth it. Now I just let things slide.
The tail-gating on the motorway and subsequent traffic congestion does wind me right up though. Especially annoys me when there are Matrix signs saying "40mph" or something, which 99.9% of drivers pay no attention to, and then when those drivers doing 80mph still approach the slow traffic they find it helpful to put on their hazard lights, warning everyone behind.