If you are unable to add additional time to your parking stay, it is likely that:
  1. You have reached the maximum parking time allowed for that space.
  2. You do not have to pay as no payment is required (check posted signs for hours of operation).
  3. You have parked in a restricted space (check posted signs for special restrictions like parking during rush hour).
  4. You are only allowed to enter one transaction per zone. There is currently a two hour lockout per zone, once a session has started.