Was put on the bus (back in 2002) for an outstanding warrant.
Apparently the on the spot fine in your presence with your acknowledgement by way of signature is a summons to pay or to defend in court. If you fail to act on this type of fine, either by not paying and not appearing in court if you did not pay, a warrant gets issued.
I got one on the day of my son's birth. On the way home from the hospital. KK was very nice and asked about the health and weight etc. I thought: This is my lucky day! Not! R400 fine for not wearing seatbelt and not having my liecense on me. (I later found it in my jacket in the boot. :roll:

)
Anyway. Forgot about it and was pulled over one Friday afternoon on the way home. Was a shock when they told me to pull into the space next to the bus. On the bus there were quite a few dumb struck people already there. I think my facial expression must have been very close to their's. :shock:
I eventually went to pay the fine (now R 800 with contempt of court slapped on). The printout showed about 15 outstanding tickets. This they ignored. They only acted on the warrant.
Lesson: If you don't pay and can't pay on the day of the road block, you spend the weekend in the chookie! :shock: