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‘Safety in Numbers’ should be our loudest bicycle safety cause

The evidence is piling up that the absolute best way to improve bicycle safety is by increasing the number of riders. It’s not helmets, it’s not bike lights. In fact, the new riders don’t even need to be experienced riders. There just needs to be more of them.

Elly Blue wrote an excellent column for Grist laying out the argument. Bike lanes, cycle tracks and other infrastructure clearly prompts more people to take up the bicycle. Cities with more bike infrastructure typically have better safety records. But perhaps it is not the lanes that make bike riding safer, but the fact that they urged more people to ride:

Research has been steadily showing, actually, that the more people are out there riding bicycles, the safer bicycling becomes. As ridership goes up, crash rates stay flat. It’s happening in Portland (see page 11 of this report [PDF]). It’s happening in New York City.


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Public health researcher Peter Jacobsen carried out a fascinating study in 2003 about the safety in numbers phenomenon. The correlation between the number of riders and rider safety is clear, according to the report:

The Growth Rule implies that, over a wide range of circumstances, if cycling doubles, the risk per cyclist will fall by about 34%. Conversely, if cycling halves, the risk per cyclist is likely to increase by a staggering 52%.

Much of the safety increases may be attributable to changes in driver behavior. The more bikes, the more used to them drivers become. And this makes sense to me, because Seattle drivers are incredible compared to other cities I have lived in. Almost all of them are courteous, give me the space I need to feel safe, yield to me when I am huffing my way up a hill, and wait behind me if there is not sufficient room to pass. Clearly there are exceptions out there, but this is most certainly the norm, and I love it. Compared to drivers in Kansas City, Seattle is practically Amsterdam (though I hear things in KC have gotten better).

But imagine if the number of people riding bikes doubled. According to this study, the risk to each of us would go down 34 percent. Safety is by far the biggest concern among potential bike riders. Lucky for us, the more people riding bikes, the safer it gets, the more people ride bikes, etc… What a wonderful feedback loop of safety and bicycles!


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7 responses to “‘Safety in Numbers’ should be our loudest bicycle safety cause”

  1. eric.br

    thanks for reminding me that a majority of drivers in seattle are nice and courteous. last night i crossed over two lanes of heavy traffic on 11th ave NE to make a left onto Ravenna from 11th’s newest bikelane …

    and it was easy as punch. just pointed and was provided ample room. sometimes my negative interactions with cars are so negative i forget that 99% of folks driving are nice.

    thank you kindseattle drivers.

  2. Duh

    Yes please, fill the roads with more bikers…you’ll really be the toast of the town. Roads are for cars.

    1. Garath

      No, roads are for vehicles. In Washington state, bikes are vehicles, without an asterisk. It strikes me as funny that you think that roads are meant for cars, when the history of the road is at least 60 times longer than that of the car.

    2. Eric Berg

      Wrong! Roads are public rights of way. They are for people to travel on. Poor and/or misguided planning has allowed one mode (cars) to take over many of these rights of way, despite the fact that they are very inefficient users of the available space, cause vast amounts of property damage, and subject the public to great risk of many injury or death.

  3. […] to have plateaued at somewhere between 359 and 392 crashes per year. This means Seattle is seeing the same “safety in numbers” trend recorded in cities with growing cycling populations around the […]

  4. […] As more people cycle, riding a bike gets safer for everyone. And one key to getting more people to bike? Cycle tracks and neighborhood greenways, says the report: One important priority for the BMP update is to incorporate new types of facilities that feel safe and appeal to a broad range of people. These facilities include neighborhood greenways, which are improvements made to residential streets to optimize biking and walking, and on-street bicycle facilities with a greater degree of separation from motorized traffic, such as buffered bike lanes and cycle tracks. The plan will include goals and policies that reflect community interest and support of these facility types and continued innovation. […]

  5. […] Instead, those cities focus on safe and inviting bike routes and encouraging more people to ride, triggering a safety in numbers effect. […]

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