How did you get along with your supervisor? Was s/he someone that you like or was s/he overbearing? My guess is that the supervisor is representing that part of the psyche that feels like it is either in charge or is expecting you to answer to it.
That you worked writing parking tickets is especially interested from a symbolic standpoint. Think about the action in waking life--you wrote tickets to people who had overstayed their welcome. You were the authority figure that people had to, in a way, answer to. Now, you have quit your job and my guess is that while you are consciously happy and feel confident in your decision, there is this part of your unconscious that worries and feels fearful--a part of you that feels as if it's not really doing anything but is just "parking" and is going to get a ticket if it doesn't get moving.
However, the important thing to realize that these are feelings, not necessarily omens or portents of the future. One of the functions of dreams is to either reflect our psychological state of mind or to compensate for something that is lacking. It sounds like it your case, the dreams are compensating for the unconscious anxiety over your job situation.
This happens to me quite often. I used to work on an inpatient psychiatric unit and I also managed a program for the homeless. What was interesting is that these jobs came with a high amount of stress and trauma, but the funny thing is that I never consciously felt the stress--not even when I was dealing with serious issues with my clients. I think it was a survival mechanism--shutting out anything that was going to interfere with me getting the job done. But all that stress had to go somewhere and where it went was directly into my unconscious where it was expressed in all manner of bizarre work related dreams.
If the dreams don't make you uncomfortable while dreaming, then I think they are probably dreams helping you process anxiety and probably some left over stress from when you were working. And just out of curiosity, do you have any unresolved issues with your supervisor?