Couple of pet peeves -
Drivers that don't get moving promptly when traffic in a stopped queue starts to move. Each dopey prat in the queue that does this means another car further back doesn't get through on the light's phase.
My biggest pet peeve is stop start traffic, Wears my breaks out, uses my gas and makes me frustrated. I will sit in first and roll at 10KPH the whole time down Lake road into devonport, I might even get a 20-50M gap infront of me but I don't close it, Just keep coasting. I watch everyone rushing infront of me go stop start stop start stop start and laugh.
Also when you stop start so on every driver behind you takes time to react and then the time needed to react and stop gets greater and greater until a nose to tail happens or someone is caught offguard. I keep a stedy flow in traffic and stops these issues for people behind me and alleviates congestion. (Proven fact)
Also those dopey drivers will boost off and accelerate to close the gap then slam the brakes on and causes the same chain reaction with reaction times.. Makes everyone behind them go stop start etc etc..