There are many things that make me nervous. Most of it is my unaccountable or imagined fear. But getting late disturbs me a lot. So, I always start early to avoid tension.

I am afraid of the queue thinking I will not reach the counter before the bus leaves or the train leaves.
I was in tension many times in life for getting late not because I was late. It was because the flight was not on time, or the train was late or that I had no information of the timings.