According to DDOT, a grease spill has closed U Street NW from 9th to 16th, and 14th Street NW from T to V, as the road is currently unsafe. The grease makes the whole roadbed slippery like you would not believe. The grease may have come from a trash hauler, according to DDOT’s twitter account. The city is putting out sand for the moment, but will also have to clean the street before it can be reopened. Avoid the area by car.