Nothing should be able to disturb your inner peace. Keep asking yourself questions and going deeper to bring more peace within. Of course, there are times that it can happen but continue to work on yourself and you will be at peace more consistently.
Traffic, people arguing with you, tasks, deadlines, crappy situations, these are all external forces that are happening because other's are going through something negative or made a mistake.
Try to have absorb that energy with empathy and simply spread more love.