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Traffic, Transportation and Parking Consultants |
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| U.S. Department of State Harry S. Truman Building |
| Perimeter Security Study - Washington, D.C. |
 The U.S. Department of State (DOS), like the nation, is faced with new and unprecedented international threats to security. Accordingly, the department is evaluating acceptable and innovative ways to secure the Harry S Truman Building and its occupants from  terrorist actions.Unsightly Jersey barriers have been used to close C and D Streets to non-DOS traffic; remove the east and west traffic lanes on 21st Street; establish a truck checkpoint on the east side of 21st Street; and remove the east traffic lane on 23rd Street. The department is considering enhanced perimeter security by closing additional streets, traffic lanes, and a highway ramp to move traffic further away from the building. Wells + Associates was retained by the DOS to evaluate the impacts of these closures on vehicular mobility. Twenty two (22) intersections were analyzed within an 11-block area around the building. Existing intersection levels of service, delays, and queues were analyzed. Changes in levels of service, delays, and queues were evaluated under multiple, alternative street closure proposals. Wells + Associates determined that peak hour delays would decrease by approximately about five percent by re-opening C Street. Delays would increase by up to 40 percent, if the Virginia Avenue ramp off of the E Street Expressway and 21st Street were closed. |
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