@kensanata Per unit of time travelled is another interesting breakdown.

Air travel is often cited as far safer than automobile, which it is measured in distance.

Measured in time travelled, they're far more equivalent.

Interesting thing with transportation is that ultimately populations tend to normalise for time spent travelling, rather than distance. (We tend to presume the opposite.) So that increasing rate of travel doesn't actually save time, it only increases distances involved.

The other factor of traffic congestion tending to consume the improved efficiency is ... another prime element.

@Sandra @tursiops

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