Apparently, only a tough punitive crackdown will bring our drivers to their senses. I therefore suggest:
a.) abolish the 50% discount for payment within 8 days,
b.) a regular increase of the penalty: for a second offence in the same year a factor of 2, for a third offence a factor of 5, etc.
Why do our drivers obey the rules abroad? Because the penalties are immediate and more severe. There are exceptions, of course, but as a rule this is true.
 
But for a person who commits 3 or more offences in a year, these factors increase accordingly.