[wazoox]

> By what science is this the case?

Obviously, an old guy in a very old rusty driving at 5 mph over the limit is more dangerous than a young professional nascar pilot, running a brand new porsche at the same speed.

However this is a bout equality versus equity. Equity means : you pay fines proportionally to what you earn; on the other hand you could then discuss the fact that different drivers and different vehicles may be treated differently (for instance, the speed limit is the speed at which your vehicle comes to full stop in 2.5 seconds). equality means everybody is treated the same way. The current system tends to equality, but is not equitable.