
Stand at a busy street corner in midtown any weekday morning and just watch what happens. You’ll see a dozen dangerous crimes a minute: drivers "squeezing" the light or just plain ignoring it, drivers bullying pedestrians out of the crosswalk in a very lopsided game of "chicken," drivers stomping on their accelerators and peeling out of a stalled lane into another that offers an irresistible ten feet of Open Road, only to shudder to a squealing stop half a second later.
Enforcement is essentially nonexistent: when was the last time you saw, or heard of, a driver being ticketed for not yielding the right-of-way to a pedestrian? Or for reckless driving after forcing a cyclist off the road? It just doesn’t happen.
Killed By Automobile, Komanoff’s next comprehensive study, adds pedestrians to the equation and delves into some of the root causes of collisions. Some eye-opening stats jump out:
- Drivers are at fault in almost 90% of pedestrian and bicyclist deaths.
- Aggressive turning through crosswalks is the single biggest known cause of pedestrian deaths. The oft-scapegoated Drunken driving ranks 12th.
- In over 90% of pedestrian fatalities, the driver is male (compared to a 75% incidence of male drivers in Manhattan). Per mile driven, male drivers killed bicyclists at 10 times the rate of female drivers.
- The most frequent cause is a turning vehicle in a crosswalk striking a pedestrian. Speeding, and driving through a red light or stop sign, are the next most frequent causes.
Researchers in several countries are documenting, and quantifying, this safety-in-numbers effect: they’re observing a “power law” relationship of approximately 0.6 between cyclist numbers and cyclist safety.
What does that mean? It means that the probability that an individual cyclist on a particular road or in a city or region will be struck by a motorist declines with the 0.6 power of the number of cyclists on that road or in that region.
Maybe I should give an example. Say the number of cyclists triples. Since three raised to the negative 0.6 power is roughly one-half, each tripling in cycling volume brings about a halving of each cyclist’s crash risk.
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