Definitely, the application of the punishments of law (and the interpretation of the law) are critical components in the judicial system. However, care in selecting judges can be a bit tricky when they are selected by political representatives (as I believe they are in the United States), on the other hand, the idea of electing judges or allowing the law societies to appoint judges are also systems that can have their own particular downsides... and advantages.
It is an interesting idea of different tiered speeding licence (I think it most countries, we call it a diplomatic plate... ha ha...). However, isn't the greatest danger on motorways, the difference in relative speed between cars, and less so the absolute speed of the vehicles? Wouldn't that make the problem worse? I guess you could have high speed roads that you could only use with the special licences, but that has other ramifications....