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On Portland’s Hawthorne Bridge, 20 Percent of Traffic Is Bikes

Ever encountered a transportation agency that says it's not worth the money to install bike access on an urban bridge, because bikes aren't "real transportation"? Point them to the case of Portland's Hawthorne Bridge.

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Jonathan Maus at Bike Portland reports that the bridge just recorded its two millionth bike trip since it began electronically tallying riders around this time last year:

That puts the average weekday amount of bicycle trips over the bridge (in both directions) at about 5,600. For comparison, there's an estimated 22,000 cars crossing the bridge on an average weekday — which means bicycle traffic accounts for about 20% of the bridge's total vehicle traffic.

Thanks to the web interface that keeps a running tally of the data collected by the counter, we can dive into trip statistics on a daily, weekly, and monthly basis. So far, the highest recorded day was June 8th of this year with 9,834 bicycle trips (that date also happened to be the World Naked Bike Ride). When you look at weekly and daily totals, it becomes very clear that weather plays a major factor in how many people bike each day. PBOT hasn't crunched recent numbers alongside weather patterns yet, but my cursory analysis shows a drop-off of about 2,000 daily trips when the weather turns iffy (we hope to share more data on the weather correlation in a separate post).

These numbers validate what we've known for years: The Hawthorne Bridge is a key artery in our road network and Portland is much better off because so many of the vehicles it carries happen to be bicycles. As we shared back in 2010, since 1991 Portland has increased the amount of people who travel to and from the central city via the Hawthorne Bridge by 20%; and because that increase in total vehicle traffic has been almost entirely bicycles, we have reaped major benefits. If the motor vehicle trips had increased at the same rate, we would have widespread congestion, more toxic pollution in our air, and we would have a more urgent need to make costly investments into the bridge and adjacent roads and ramps.

Elsewhere on the Network today: Greater City Providence shares a video announcing the city's ambitious zoning overhaul. The Architect's Newspaper reports that California Senator Barbara Boxer has been named "National Asphalt Legislator of the Year" by industry groups for her leadership in passing the current transportation bill. And Cyclelicious asks whether portrayals of cycling fully reflect the diversity of people who bike.

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