[mastazi]

> This is why fatalities per mile are higher on a bike, but fatalities per trip are actually slightly lower than a car: people with cars take longer trips.

Maybe I'm just dense but how does that invalidate parent's point? Based on what you are saying (difference in trip length), it appears that fatalities per mile actually does a better job (than fatalities per trip) at representing the relative safety of different classes of vehicles...

[lmm]

The question most people care about is something like "would buying a car make me more or less likely to die". If buying a car means you're safer per-mile but leads you to take longer trips, then not buying a car is safer.