Capturing major DC events on bike and walking counters

Bike/ped traffic counter spikes for disruptive events emphasize importance of transportation options

Arlington has 38 bike and pedestrian counters along its trails and bike lanes, six of which capture how many people cross the Potomac River into Washington, D.C., every day. Two counters are located on Memorial Bridge, two on Key Bridge, one on Roosevelt Bridge, and one on the 14th Street Bridge.

The counters provide a look at what kind of bike/ped activity occurs on bridges into D.C. when there have been major events that disrupt street traffic and create crowding on transit. The bike and pedestrian daily counts can show how people are thinking as to when they resort to two wheels or their own feet.

How did the numbers of people in Arlington traveling by bike or foot compare to bike/ped ratios on normal weekends or holidays, when commuter traffic is more typical? Looking into this change could clarify how residents seek alternatives when major events disrupt transit and car traffic.

counter events

The events

Of the recent events captured in counters, the Women’s March induced the highest turnout by far, with a nearly 500 percent increase in bike and pedestrian traffic above the average weekend day or holiday. Meanwhile, Trump’s Inauguration doubled typical counts.

The travel ban protest, on January 29, 2017, drew about a 40 percent increase. As a small-scale event organized with little advance notice, the protest is still a notable recent event, as it drew thousands into the streets of downtown D.C.

The Pope’s visit to DC and Obama’s inauguration both induced a mild increase in traffic. In these cases, as with the Trump inauguration and Women’s March, much of the crowd likely came from out of town. It seems, though, that street closures around the Pope’s visit encouraged many to attempt a bike ride. Also notable: the Pope visited in September, when the weather was much more comfortable for riding.

Overall, pedestrian traffic seems less responsive to events than bike traffic. Perhaps the speed of biking allows bicycles to better replace transit and driving options. In each case, there are multiple reasons why more people might be biking or walking across the Potomac. In many instances the event closures force drivers or transit riders to switch modes in order to get to their usual destinations. In other cases, the events draw new visitors and curious Arlington residents into the District, who may augment normal counter figures.

The total attendance numbers are important to recognize: The travel ban protest, at an estimated 5,000 in attendance, was small, as a reactive protest organized in just two days. Meanwhile, Obama’s 2013 Inauguration drew 1,000,000 attendees, and Trump’s Inauguration and the Women’s March brought in at at least 250,000 and 500,000 respectively. The Pope’s visit to D.C. doesn’t seem to have cut and clear attendance numbers, as he traveled to multiple destinations within the District, but he spoke to a crowd of 11,000 people on the White House lawn on September 23, 2015.

Weather is another significant factor that should be recognized: Trump’s inauguration faced cold rain, and Obama’s 2013 ceremony was cool and cloudy. The Pope’s fall visit, however, was largely sunny and temperate.

The Memorial Bridge counters do not distinguish between bicyclists and pedestrians so that counter was only included in the total counts, but not in the individual bike and pedestrian breakdown. For the percent increase calculations, traffic counts on the day of the event were compared to weekend and holiday averages for the same month they occurred in (excluding the days of the events themselves).

Regardless of the exact reasons for the new biking and walking trips, the raised counts highlight the availability of additional travel options that can ease the impacts of major events on the D.C. area.

Photo: Pedestrians and a bicyclist on the Arlington side of the Memorial Bridge, looking eastward into D.C. (Sam Kittner for Mobility Lab,

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