Tomorrow will be the lighting of the National Christmas Tree, so there are going to be road closures affecting downtown DC commuters Thursday afternoon.
Using the list of roads being closed from the article http://wtop.com/dc/2016/11/road-closures-announced-christmas-tree-lighting/ I made a map of road closures here:
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Also to note from the article:
The three services also released a list of items that attendees can’t bring:
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Bicycles, folding chairs, balloons, coolers, glass, thermal or metal containers;
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Those looking to try and cut through the closed off area might have difficulty due to the bicycle ban.