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The single most useful thing to understand about business travel into Washington has nothing to do with cars. Reagan National operates under a statutory perimeter rule that caps most nonstop flights at 1,250 miles, with only a limited set of exemptions granted by Congress. It is also slot controlled, with a ceiling on hourly takeoffs and landings. The practical consequence for a corporate traveller is that the convenient airport, fifteen minutes from downtown, frequently cannot serve the route you need. Transcontinental and international itineraries are pushed out to Dulles, which is a very different drive.
So the first question we ask about a Washington programme is not which car you want but which airport your itinerary actually forces. A Reagan National arrival and a Dulles arrival on the same afternoon require different pickup times, different routes and different contingency. Treating them as interchangeable is the most common way a schedule goes wrong here, and it is the reason a team flying in from the West Coast should not be planned as though they were coming from Chicago.
Rail matters more in Washington than in most American cities. Union Station puts the Northeast Corridor directly into downtown, and for New York, Philadelphia and Boston legs the train is routinely the better instrument than a flight once airport time is counted honestly. The Silver Line now runs to Dulles, which has changed the calculation for some travellers, though for a principal arriving with luggage and a meeting to reach it rarely beats a car.
On the ground, the constraints are federal. Security perimeters around the Capitol complex and the White House close streets with little notice, motorcade movements stop cross-town traffic outright, and the K Street and Golden Triangle corridors that hold most of the city law firms, associations and consultancies are precisely where that disruption lands hardest. We plan approaches around I-395, Rock Creek Parkway and the George Washington Memorial Parkway rather than assuming the direct route will be open.
Gratuity is included in every HSB Sedan Service Inc reservation and additional gratuity is welcome but never expected or required. Cancellation is free up to six hours before pickup, and airport arrivals include 60 complimentary minutes of wait time counted from the moment the aircraft is gated.

HSB Sedan Service Inc. provides luxury chauffeur and black car services across Washington, DC, Maryland & Virginia. Executive airport transfers, corporate travel, weddings, events & hourly service with professional chauffeurs and premium vehicles.