Zero fatalities per 15 million miles is not a great metric. For one thing, cars boast less than 0.3 fatalities per 15 million miles, so if anybody dies between

Zero fatalities per 15 million miles is not a great metric. For one thing, cars boast less than 0.3 fatalities per 15 million miles, so if anybody dies between now and 45 million bike miles that will not be a great statistic. I'd wager that 1 million bike miles represent far more trips than 1 million car miles, though, since obviously bikes are (usually) used for shorter trips than cars.