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Hypothetical study of bike infrastructure on crashes using ridership data from a fitness-oriented app and an overall selection probability to upweight bike-distance.
| Conventional bike lane | Protected bike lane | |
|---|---|---|
| Crashes | 55 | 8 |
| Bike-distance ridden (km) | 5,178 *(1/0.168) = 30,821 | 763*(1/0.168) = 4,542 |
| Crash rate per bike-km ridden | 0.00178 | 0.00176 |
| Rate ratio | 0.00178/0.00176 = 1.01 | |
