I find it odd that there is so much emphasis on enforcement of speed limits. Studies have shown that speed limits above and below the prevailing speed of most drivers is a much higher risk factor that raw speed. And then there are other behaviors such as using a cell phone and driving that may be criminalized, but do not seem to receive such fervent enforcement.
not sure why this is downvoted. I have found it quite hard to find good research tying speeding to accidents. the best you get from NHTSA is accidents where speeding "was a factor". the fraction of accidents where speed was a factor is surprisingly low (around 25% IIRC), and I'm pretty sure they count speeding as a "factor" whenever someone happened to be speeding right before the incident. I'm inclined to think spee…
A driver exceeding the speed limit by 20%, to throw out a number, isn't likely to do so as a one-off mistake unless he misses a signed change in the speed limit. If exceeding by 20% was a one-off under an unchanged speed limit, it most likely means the driver was already exceeding the speed limit by 10-15% as a matter of course. I am much more comfortable with a driver being cited in this case.