The Safety-in-Numbers Effect Surfaces in Minneapolis Bike Crash Data

פורסם: 24 בינו׳ 2013, 14:37 על ידי: Sustainability Org   [ עודכן 24 בינו׳ 2013, 14:37 ]

by Angie Schmitt, January 18 2013

New data from Minneapolis confirms: the more cyclists on the road, the safer they will be. Image: Twin City Sidewalks via the City of Minneapolis

Minneapolis’s public works department just completed a rigorous, long-term analysis of bike-car collisions, and they’ve released a trove of data.

Bill Lindeke at Network blog Twin City Sidewalks says it might be “as good a study of crash data as you’re ever likely to see in this country.” There were a number of interesting findings, many of which bolstered previous research.

For example, as shown in the chart above, a confirmation of the safety-in-numbers effect popularized by researcher Peter Jacobsen:

It’s long been a truism in nonmotorized transportation planning that safety improves dramatically as the overall number of bicyclists and pedestrians rise. Well, this seems to hold true for Minneapolis over the last decade, and is one of the most hope-inspiring pieces of the bicycling puzzle…

What this suggests to me is that bicycle advocates should focus their efforts on increasing the total number of cyclists. In a way, safety issues will take care of themselves once we begin to increase the overall awareness and frequency of bicycling in the Twin Cities.

Here’s another takeaway from Lindeke:

Probably the single most one-sided part of the bicyclist-driver relationship is that bicyclists are the ones that suffer all the injuries. In fact, check out this snippet from the study: “Detailed analysis of 800 crash reports from 2006-2008 found that when an injury was sustained, it was always the bicyclist. Motorists sustained injuries in no crashes.”

Often, when talking about urban bicycling, arguments devolve into “bike vs. car” diatribes, with each group pointing out the other’s supposed misdeeds. There might be some validity to this kind of balanced framing, but it’s worth remembering that only one side of this equation has any physical vulnerability. Only one side is paying the physical cost. It’s the exact opposite of an equal relationship.

If only every city had the wherewithal and the motivation to monitor cycling safety so closely. In the meanwhile, less-resourced cities can likely learn a thing from this study.


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