When Mt Saint Helens erupted there was an account from a survivor who raced away at 100mph, passing a car traveling at 80mph and seeing the slower car disappear into the ash cloud with little chance of surviving. Even in in the most extreme events your proposed limit is adequate.
lamontcg|3 years ago
40,000 highway deaths per year, but its vitally important to keep in mind that one guy that escaped an erupting volcano over 40 years ago.
MerelyMortal|3 years ago