...but it's being spelled "compactifiy" with an extra "i" in the summary. Double sigh.
There are around 43,000 traffic fatalities per year in the US. If we posit that a mere 60,000,000 people (only 1/5th of the US population) get in a car or cross the street on foot every year, that's a total death rate of about 0.00072%.
43,000 divided by 60,000,000 is 0.00072, which is 0.072%.
You'll therefore have to excuse me if I find your math lacking.
A rolling disk gathers no MOS.