Speed-limit enforcement is arbitrary, and the fines have no relationship to justice or simple fairness. Countless fees and charges continue to ratchet ticket costs ever higher.

How about a sensible, easy-to-understand formula

Factors would consider the type of vehicle is doing the speeding
high-performance machinery should be rewarded with acknowledgment that the vehicle is capable of safely operating at higher speeds, while lesser vehicles driven fast are death on radials and deserve higher fines

the vehicle’s 70-to-zero braking distance.
the better a vehicle at slowing down safely and quickly, the less it should be fined

the environmental conditions at the time
was the road dry? Wet? Was there plenty of light?

https://blog.caranddriver.com/fine-whine-a-semiserious-proposal-for-rationalizing-speeding-fines/