The rates in JHB/PTA are:
11-15kM/h over R250/R125 if you pay within 30 days.
16-20kM/h over R500/R250 if you pay within 30 days.
21-25kM/h over R750/R375 if you pay within 30 days.
26-30kM/h over R1000/R500 if you pay within 30 days.
31-35kM/h over R1250/R625 if you pay within 30 days.
36-40kM/h over R1500/R750 if you pay within 30 days.
Over 40kM/h you have to go to court.
It can depends on the speed vs limit.. but i see the AARTO Guideline 2008 has the costs the same based on speed over. That being said the Municipality decides on the fee charged