tomahawk Wrote:
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> It looks like a pipe with a cap on it.
As the other person wrote, it's a bike/pedestrian counter, specifically an Eco-Combo Urban Post:
http://www.eco-compteur.com/Additional-Products.html?wpid=25142
Arlington County has a website where you can check the results of the various bike and pedestrian counters they've installed.
http://www.bikearlington.com/pages/biking-in-arlington/counter-dashboard/
Assuming that's the Key Bridge East sensor, 2388 people and 929 bicycles passed over that spot on 6/19/2014.
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