HDB parking confusion

There's an interesting thread on MyCarForum about the wording of the HDB car park regulations, ostensibly causing some confusion. It motivated me to look up the rules on the HDB website, where I found this...

Night Parking Scheme

Car parks that allow night parking by visitors are identified by signboards bearing the parking times and charges. For easy identification, the signboards are lighted up after 7pm.

For night parking charges at night parking car parks, motorists who park between 10.30pm and 7.00am can pay the half hourly rate of $0.50 up to a maximum of $2 or a flat rate of $2.00 depending on their parking needs.

Link

Always thought the full $2 had to be paid if parking was after 10.30 pm! UGH! :(

So the algorithm should be as follows:

1. Pay $0.50 for every half-hour.
2. If parking for more than 2 hours, but not beyond 7 am, and if the next day is not a public holiday/Sunday, pay $2.